Android 自定义相机保存图片

Android实现自定义相机

前言

开发安卓过程中，经常会用到相机，有时候系统相机不能满足开发者的需要，这时候就需要自定义相机来实现。（注意：本文只是提供思路，有关键代码，但是代码不全）

相机说明

自定义相机Activity需要用到Camera这个安卓原生的相机类，需要一个surfaceView来预览，如果要拍照声音还需要一个ToneGenerator类，如果需要监听屏幕旋转角度，需要实现SensorEventListener这个监听，还需要感应重力的Sensor以及SensorManager。

SurfaceHolder以及SurfaceHolder.Callback 
surfaceHolder它是一个用于控制surface的接口，它提供了控制surface 的大小，格式，上面的像素，即监视其改变的。SurfaceHolder.Callback在底层的Surface状态发生变化的时候通知View。

相机启动

启动相机是在surfaceHolder的回调函数surfaceCreated里面做，需要注意启动相机前要做一些配置：

配置文件

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">surfaceview<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.getHolder</span>()<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setType</span>(SurfaceHolder<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.SURFACE</span>_TYPE_PUSH_BUFFERS)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;//设置surfaceview不维护自己的缓冲区，而是等待屏幕的渲染引擎将内容推送到用户面前</span>surfaceview<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.getHolder</span>()<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setFixedSize</span>(width, height)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>surfaceview<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.getHolder</span>()<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setKeepScreenOn</span>(true)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;// 屏幕常亮</span>surfaceview<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.getHolder</span>()<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.addCallback</span>(new SurfaceCallback())<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;// 为SurfaceView的句柄添加一个回数调函</span>sensorManager = (SensorManager) getSystemService(Context<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.SENSOR</span>_SERVICE)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>sensor = sensorManager<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.getDefaultSensor</span>(Sensor<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.TYPE</span>_ACCELEROMETER)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>orientation_SensorListener = new OrientationSensorListener(sensor_handler)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>sensorManager<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.registerListener</span>(orientation_SensorListener, sensor,SensorManager<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.SENSOR</span>_DELAY_UI)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>

启动相机的方法

<code class="hljs java has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-javadoc" style="color:#8800;box-sizing: border-box;">/** * 启动相机 */</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">startCamera</span>() {    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">try</span> {        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span> == mCamera) {        <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// 获得Camera对象</span>        mCamera = Camera.open();        <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// 设置用于显示拍照摄像的SurfaceHolder对象</span>        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (mCamera != <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>) {            SurfaceHolder mSurfaceHolder =surfaceview.getHolder();            mCamera.setPreviewDisplay(mSurfaceHolder);            mCamera.setErrorCallback(<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> CameraonError());<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//记录相机错误的回调函数</span>            mCamera.startPreview();            }        }        } <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">catch</span> (Exception e) {            e.printStackTrace();            <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// 释放手机摄像头</span>            Toast.makeText(PersonPhotoActivity.<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">this</span>, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"相机启动失败请重新启动"</span>,Toast.LENGTH_SHORT).show();            <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (mCamera != <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>) {                mCamera.release();                mCamera = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>;            }            finish();        } <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">finally</span> {            is_takingPhoto = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">false</span>;<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//防止连拍的标志</span>        }    }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li></ul>

surfaceHolder的回调函数

<code class="hljs java has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">final</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">class</span> <span class="hljs-title" style="color:#66066;box-sizing: border-box;">SurfaceCallback</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">implements</span> <span class="hljs-title" style="color:#66066;box-sizing: border-box;">Callback</span> {</span>    <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// 预览变化时调用该方法</span>    <span class="hljs-annotation" style="color:#9b859d;box-sizing: border-box;">@Override</span>    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">surfaceChanged</span>(SurfaceHolder holder, <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">int</span> format, <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">int</span> width,<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">int</span> height) {    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">try</span> {        Camera.Parameters parameters = mCamera.getParameters();        parameters.setPictureFormat(PixelFormat.JPEG);        parameters.setPictureSize(<span class="hljs-number" style="color:#06666;box-sizing: border-box;">1920</span>, <span class="hljs-number" style="color:#06666;box-sizing: border-box;">1080</span>);<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//设置照片分辨率16:9</span>        mCamera.setErrorCallback(<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> CameraonError());        mCamera.setParameters(parameters);        mCamera.startPreview();        } <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">catch</span> (Exception e) {        }    }    <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// 开始预览时调用该方法</span>    <span class="hljs-annotation" style="color:#9b859d;box-sizing: border-box;">@Override</span>    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">surfaceCreated</span>(SurfaceHolder holder) {        startCamera();    }    <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// 停止预览时调用该方法</span>    <span class="hljs-annotation" style="color:#9b859d;box-sizing: border-box;">@Override</span>    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">surfaceDestroyed</span>(SurfaceHolder holder) {        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (mCamera != <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>) {            mCamera.release(); <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// 释放照相机</span>            mCamera = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>;        }    }}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li></ul>

相机拍照

点击拍照按钮，拍照时调用自动对焦（无法自动对焦时怎么做？）

<code class="hljs java has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">takePicture</span>() {    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (!is_takingPhoto) {        is_takingPhoto = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">true</span>;<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//防止多次调用</span>        Toast.makeText(getApplication(), <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"点击拍照按钮后请不要晃动,以免影响图片拍摄效果!"</span>,Toast.LENGTH_SHORT).show();        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (mCamera == <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>) {            Reset();            startCamera();        } <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">else</span> {            <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// 自动对焦</span>            mCamera.autoFocus(<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> AutoFocusCallback() {            <span class="hljs-annotation" style="color:#9b859d;box-sizing: border-box;">@Override</span>            <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onAutoFocus</span>(<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">boolean</span> success, Camera camera) {            <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// 自动对焦成功后才拍摄</span>            <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (success) {                img_focus.setImageResource(R.drawable.focus2);                sensorManag.unregisterListener(                                orientation_SensorListener);                mCamera.takePicture(shutterCallback, <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>,<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> MyPictureCallback());                mCamera.cancelAutoFocus();<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//有人说加这行可以使无法对焦的机器去自动对焦，在小米手机上试了好用，但是不知道其他机器</span>            } <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">else</span> {                img_focus.setImageResource(R.drawable.focus1);                Toast.makeText(getApplication(), <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"对焦失败,请重拍!"</span>,                                    Toast.LENGTH_LONG).show();                is_takingPhoto = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">false</span>;                }                }            });        }    }}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li></ul>

照片捕获成功时候的处理

<code class="hljs java has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">final</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">class</span> <span class="hljs-title" style="color:#66066;box-sizing: border-box;">MyPictureCallback</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">implements</span> <span class="hljs-title" style="color:#66066;box-sizing: border-box;">PictureCallback</span> {</span>        <span class="hljs-annotation" style="color:#9b859d;box-sizing: border-box;">@Override</span>        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onPictureTaken</span>(<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">byte</span>[] data, Camera camera) {            <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">try</span> {                BitmapFactory.Options options = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> BitmapFactory.Options();                <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// options.inSampleSize = 2;</span>                <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (data != <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>) {                    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (data.length / <span class="hljs-number" style="color:#06666;box-sizing: border-box;">1024</span> > <span class="hljs-number" style="color:#06666;box-sizing: border-box;">350</span>                            && data.length / <span class="hljs-number" style="color:#06666;box-sizing: border-box;">1024</span> < <span class="hljs-number" style="color:#06666;box-sizing: border-box;">450</span>) {                        options.inSampleSize = <span class="hljs-number" style="color:#06666;box-sizing: border-box;">3</span>;                    } <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (data.length / <span class="hljs-number" style="color:#06666;box-sizing: border-box;">1024</span> > <span class="hljs-number" style="color:#06666;box-sizing: border-box;">450</span>) {                        options.inSampleSize = <span class="hljs-number" style="color:#06666;box-sizing: border-box;">4</span>;                    }                    datas = data;<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//字节流（保存图片时候使用）</span>                }                options.inPurgeable = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">true</span>;<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//内存不足时可被回收</span>                options.inInputShareable = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">true</span>;                mBitmap = BitmapFactory.decodeByteArray(data, <span class="hljs-number" style="color:#06666;box-sizing: border-box;">0</span>, data.length,options);<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//此bitmap作为预览时候使用，用完一定注意回收</span>                BitmapDrawable bitmapDrawable = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> BitmapDrawable(getResources(), mBitmap);                img_background.setBackgroundDrawable(bitmapDrawable);                img_background.setVisibility(View.VISIBLE);                <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//以下全是控件状态的变化</span>                <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//surfaceview.setVisibility(View.GONE);</span>                <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//bt_remake.setVisibility(View.VISIBLE);</span>                <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//bt_photograph.setVisibility(View.VISIBLE);</span>                <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//photograph_btn.setVisibility(View.GONE);</span>                <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//lin_takephoto.setVisibility(View.GONE);</span>                <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//btn_cancle.setVisibility(View.GONE);</span>            } <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">catch</span> (Exception e) {                e.printStackTrace();            } <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">finally</span> {                is_takingPhoto = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">false</span>;            }        }    }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li></ul>

保存图片返回本地地址url

<code class="hljs cs has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> String <span class="hljs-title" style="box-sizing: border-box;">savephoto</span>(String path, String name, <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">byte</span>[] imagedata) {        String msgPath = path  + name;        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">try</span> {            <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//判断目录是否可用</span>            <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (!Environment.getExternalStorageState().equals(                    Environment.MEDIA_MOUNTED)) {                <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">return</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>;            }            File file = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> File(path);<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//创建文件</span>            <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (!file.exists()) {                file.mkdirs();            }<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//          file.createNewFile();</span>            BitmapFactory.Options options = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> BitmapFactory.Options();            options.inSampleSize = <span class="hljs-number" style="color:#06666;box-sizing: border-box;">4</span>;            options.inPurgeable = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">true</span>;            options.inInputShareable = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">true</span>;            Bitmap bitmap = BitmapFactory.decodeByteArray(imagedata, <span class="hljs-number" style="color:#06666;box-sizing: border-box;">0</span>,imagedata.length,options);            FileOutputStream fi = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> FileOutputStream(path +  name);            bitmap.compress(Bitmap.CompressFormat.JPEG, <span class="hljs-number" style="color:#06666;box-sizing: border-box;">90</span>, fi);<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//压缩质量</span>            fi.close();            fi.flush();            bitmap.recycle();<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//bitmap释放</span>            bitmap = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>;        } <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">catch</span> (Exception e) {            e.printStackTrace();            msgPath = <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"error"</span>;<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//保存出错</span>        }        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">return</span> msgPath;    }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li></ul>

保存图片调用

<code class="hljs java has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">bt_photograph.setOnClickListener(<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> OnClickListener() {            <span class="hljs-annotation" style="color:#9b859d;box-sizing: border-box;">@Override</span>            <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onClick</span>(View v) {                String path = ImageUtils.getInstance().savephoto(filePath,fileName, datas);                is_takingPhoto = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">false</span>;                <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (path.equals(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"error"</span>) || path == <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>) {                    Toast.makeText(PersonPhotoActivity.<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">this</span>, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"图片保存失败,请重新拍照!"</span>, <span class="hljs-number" style="color:#06666;box-sizing: border-box;">0</span>).show();                    Reset();<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//保存失败重置相机</span>                } <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">else</span> {                    img_focus.setImageResource(R.drawable.focus1);<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//对焦图片设置</span>                    img_focus.setVisibility(View.VISIBLE);                    Intent intent = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> Intent();                    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (degree == -<span class="hljs-number" style="color:#06666;box-sizing: border-box;">1</span>) {                        Log.d(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"toast"</span>, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"未捕获旋转角度"</span>);                    } <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">else</span> {                        intent.putExtra(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"degree"</span>, degree);                    }                    intent.putExtra(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"url"</span>, path);                    setResult(<span class="hljs-number" style="color:#06666;box-sizing: border-box;">10</span>, intent);<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//成功</span>                    PersonPhotoActivity.<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">this</span>.finish();                }            }        });</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li></ul>

相机重置

重置状态，重置bitmap ,重置图标

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">private void reset() {        img_focus<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setImageResource</span>(R<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.drawable</span><span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.focus</span>1)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>        img_focus<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setVisibility</span>(View<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.VISIBLE</span>)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>        img_background<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setBackgroundDrawable</span>(null)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>        img_background<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setVisibility</span>(View<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.GONE</span>)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>        surfaceview<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setVisibility</span>(View<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.VISIBLE</span>)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;//预览关闭</span>        bt_remake<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setVisibility</span>(View<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.GONE</span>)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>        bt_photograph<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setVisibility</span>(View<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.GONE</span>)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>        photograph_btn<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setVisibility</span>(View<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.VISIBLE</span>)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>        lin_takephoto<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setVisibility</span>(View<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.VISIBLE</span>)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>        btn_cancle<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setVisibility</span>(View<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.VISIBLE</span>)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>            if(mBitmap != null){            mBitmap<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.recycle</span>()<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>            mBitmap = null<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>        }        if(datas != null ){            datas = null<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>        }        if (null != mCamera) {            mCamera<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.startPreview</span>()<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;//重置相机</span>        } else {            startCamera()<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>        }    }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li></ul>

其他功能

拍照声音的实现

<code class="hljs cs has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">private</span> ShutterCallback shutterCallback = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> ShutterCallback() {    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onShutter</span>() {        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (tone == <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>)            <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// 发出提示用户的声音</span>            tone = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> ToneGenerator(                        AudioManager.AUDIOFOCUS_REQUEST_GRANTED,                        ToneGenerator.MIN_VOLUME);            tone.startTone(ToneGenerator.TONE_PROP_BEEP);        }    };</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li></ul>

开关闪光灯 
相机闪光灯是通过parameter来配置。

<code class="hljs lasso has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">private</span> <span class="hljs-literal" style="color:#06666;box-sizing: border-box;">void</span> turnLightOn() {    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (mCamera <span class="hljs-subst" style="color:#000000;box-sizing: border-box;">==</span> <span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">null</span>) {        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">return</span>;    }    Parameters parameters <span class="hljs-subst" style="color:#000000;box-sizing: border-box;">=</span> mCamera<span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>getParameters();    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (parameters <span class="hljs-subst" style="color:#000000;box-sizing: border-box;">==</span> <span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">null</span>) {        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">return</span>;    }    <span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">List</span><span class="hljs-subst" style="color:#000000;box-sizing: border-box;"><</span><span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">String</span><span class="hljs-subst" style="color:#000000;box-sizing: border-box;">></span> flashModes <span class="hljs-subst" style="color:#000000;box-sizing: border-box;">=</span> parameters<span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>getSupportedFlashModes();    <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// 是否支持闪光灯</span>    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (flashModes <span class="hljs-subst" style="color:#000000;box-sizing: border-box;">==</span> <span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">null</span>) {        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">return</span>;    }    <span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">String</span> flashMode <span class="hljs-subst" style="color:#000000;box-sizing: border-box;">=</span> parameters<span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>getFlashMode();    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (<span class="hljs-subst" style="color:#000000;box-sizing: border-box;">!</span>Parameters<span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>FLASH_MODE_TORCH<span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">equals</span>(flashMode)) {    <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// 开启闪光灯</span>    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (flashModes<span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>contains(Parameters<span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>FLASH_MODE_TORCH)) {        parameters<span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>setFlashMode(Parameters<span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>FLASH_MODE_TORCH);        mCamera<span class="hljs-built_in" style="color:#66066;box-sizing: border-box;">.</span>setParameters(parameters);<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//为相机开启闪光灯</span>        }     }}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li></ul>

关闭闪光灯，跟开启闪光灯判断一样，只是配置不同，关键代码

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">//支持关闭闪光灯模式if (!Parameters<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.FLASH</span>_MODE_OFF<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.equals</span>(flashMode)) {    if (flashModes<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.contains</span>(Parameters<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.FLASH</span>_MODE_OFF)) {        parameters<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setFlashMode</span>(Parameters<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.FLASH</span>_MODE_OFF)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>        mCamera<span class="hljs-preprocessor" style="color:#444444;box-sizing: border-box;">.setParameters</span>(parameters)<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">;</span>    } }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

捕获屏幕旋转角度

<code class="hljs java has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">private</span> Handler sensor_handler= <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">new</span> Handler() {        <span class="hljs-annotation" style="color:#9b859d;box-sizing: border-box;">@Override</span>        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">handleMessage</span>(android.os.Message msg) {            <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (msg.what == <span class="hljs-number" style="color:#06666;box-sizing: border-box;">888</span>) {                <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">int</span> orientation = msg.arg1;                <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (orientation > <span class="hljs-number" style="color:#06666;box-sizing: border-box;">45</span> && orientation < <span class="hljs-number" style="color:#06666;box-sizing: border-box;">135</span>) {                    degree = <span class="hljs-number" style="color:#06666;box-sizing: border-box;">180</span>;                    Log.e(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"180"</span>, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"右横"</span>);                } <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (orientation > <span class="hljs-number" style="color:#06666;box-sizing: border-box;">135</span> && orientation < <span class="hljs-number" style="color:#06666;box-sizing: border-box;">225</span>) {                    degree = <span class="hljs-number" style="color:#06666;box-sizing: border-box;">270</span>;                    Log.e(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"270"</span>, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"倒屏"</span>);                } <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (orientation > <span class="hljs-number" style="color:#06666;box-sizing: border-box;">225</span> && orientation < <span class="hljs-number" style="color:#06666;box-sizing: border-box;">315</span>) {                    degree = <span class="hljs-number" style="color:#06666;box-sizing: border-box;">0</span>;                    Log.e(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"0"</span>, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"左横"</span>);                } <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> ((orientation > <span class="hljs-number" style="color:#06666;box-sizing: border-box;">315</span> && orientation < <span class="hljs-number" style="color:#06666;box-sizing: border-box;">360</span>)                        || (orientation > <span class="hljs-number" style="color:#06666;box-sizing: border-box;">0</span> && orientation < <span class="hljs-number" style="color:#06666;box-sizing: border-box;">45</span>)) {                    degree = <span class="hljs-number" style="color:#06666;box-sizing: border-box;">90</span>;                    Log.e(<span class="hljs-string" style="color:#0880;box-sizing: border-box;">"90"</span>, <span class="hljs-string" style="color:#0880;box-sizing: border-box;">"竖屏"</span>);                }            }            <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">super</span>.handleMessage(msg);        }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li></ul>

重力感应改变的监听（谷歌提供）

<code class="hljs cs has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">public</span> synchronized <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onSensorChanged</span>(SensorEvent <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">event</span>) {    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">float</span>[] values = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">event</span>.values;    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">int</span> orientation = ORIENTATION_UNKNOWN;    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">float</span> X = -values[_DATA_X];    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">float</span> Y = -values[_DATA_Y];    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">float</span> Z = -values[_DATA_Z];            <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">float</span> magnitude = X*X + Y*Y;    <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// Don't trust the angle if the magnitude is small compared to the y value</span>    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (magnitude * <span class="hljs-number" style="color:#06666;box-sizing: border-box;">4</span> >= Z*Z) {        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">float</span> OneEightyOverPi = <span class="hljs-number" style="color:#06666;box-sizing: border-box;">57.29577957855</span>f;        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">float</span> angle = (<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">float</span>)Math.atan2(-Y, X) * OneEightyOverPi;        orientation = <span class="hljs-number" style="color:#06666;box-sizing: border-box;">90</span> - (<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">int</span>)Math.round(angle);        <span class="hljs-comment" style="color:#8800;box-sizing: border-box;">// normalize to 0 - 359 range</span>        <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">while</span> (orientation >= <span class="hljs-number" style="color:#06666;box-sizing: border-box;">360</span>) {            orientation -= <span class="hljs-number" style="color:#06666;box-sizing: border-box;">360</span>;        }         <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">while</span> (orientation < <span class="hljs-number" style="color:#06666;box-sizing: border-box;">0</span>) {            orientation += <span class="hljs-number" style="color:#06666;box-sizing: border-box;">360</span>;        }    }    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (rotateHandler!=<span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>) {        rotateHandler.obtainMessage(<span class="hljs-number" style="color:#06666;box-sizing: border-box;">888</span>, orientation, <span class="hljs-number" style="color:#06666;box-sizing: border-box;">0</span>).sendToTarget();<span class="hljs-comment" style="color:#8800;box-sizing: border-box;">//发送消息通知改变</span>    }}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li></ul>

类的销毁

<code class="hljs java has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-annotation" style="color:#9b859d;box-sizing: border-box;">@Override</span><span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">protected</span> <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onDestroy</span>() {    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span> (mBitmap != <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>) {        mBitmap.recycle();        mBitmap = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>;    }    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">if</span>(datas != <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>){        datas = <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">null</span>;    }    <span class="hljs-keyword" style="color:#0088;box-sizing: border-box;">super</span>.onDestroy();}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>

小结

1.为什么保存要压缩图片？ 
因为每个型号手机相机配置不一样，相机非常好的手机拍摄一张图片有可能是6-12m，如果不做处理直接放到bitmap中，展示的时候就会内存溢出，可以根据自己需要，改变压缩保存图片的方法。 
2.为什么要释放bitmap? 
相机启动本身就是一件耗费资源的事情，如果bitmap一直存在activity中不释放，当activity销毁的时候内存回收机制不会立即执行，可能导致内存溢出。 
3.为何要加入重力感应？ 
相机是有角度的，不监听角度改变，拍摄的照片就会按照相机拍摄角度显示，有感应之后放置照片按角度放置就可以。