android调用摄像头偷拍demo 无声 无预览 一件拍照存储

结合精简并优化了一下常用的拍照方法，实现了无预览拍照，下面是一个工具类

import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;import android.annotation.SuppressLint;import android.annotation.TargetApi;import android.app.Activity;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Matrix;import android.graphics.Bitmap.CompressFormat;import android.graphics.Bitmap.Config;import android.hardware.Camera;import android.hardware.Camera.PictureCallback;import android.media.AudioManager;import android.os.Build;import android.util.Log;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.SurfaceHolder.Callback;import com.cn.zongyi.safebox.Constants;import com.cn.zongyi.safebox.MyApplication;import com.cn.zongyi.safebox.ui.NewBuildSafeBoxActivity;import com.cn.zongyi.safebox.ui.R;public class CameraUtil {private SurfaceView sView; //画布视图private SurfaceHolder surfaceHolder; //画布Holderpublic Camera camera; // 定义系统所用的照相机private boolean isPreview = false;// 是否在浏览中private AudioManager manager; //声音管理private int volumn; //声音值private String picPath = "";private NewBuildSafeBoxActivity context;public CameraUtil(Context context) {this.context = (NewBuildSafeBoxActivity) context;}@SuppressWarnings("deprecation")public void initCameraFirst() {manager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);manager.setStreamMute(AudioManager.STREAM_SYSTEM, false);volumn = manager.getStreamVolume(AudioManager.STREAM_SYSTEM);if (volumn != 0) {// 如果需要静音并且当前未静音（muteMode的设置可以放在Preference中）manager.setStreamVolume(AudioManager.STREAM_SYSTEM, 0,AudioManager.FLAG_REMOVE_SOUND_AND_VIBRATE);}sView = (SurfaceView) ((Activity) context).findViewById(R.id.sView);if (MyApplication.invadeMonitor()) {// 获得SurfaceView的SurfaceHoldersurfaceHolder = sView.getHolder();// 为surfaceHolder添加一个回调监听器surfaceHolder.addCallback(new Callback() {public void surfaceChanged(SurfaceHolder holder, int format,int width, int height) {}public void surfaceCreated(SurfaceHolder holder) {// surface被创建时打开摄像头initCamera();}// surface摧毁时释放摄像头public void surfaceDestroyed(SurfaceHolder holder) {// 如果camera不为null ,释放摄像头if (camera != null) {// 7.结束程序时，调用Camera的StopPriview()结束取景预览，并调用release()方法释放资源.if (isPreview)camera.stopPreview();camera.release();camera = null;}}});// 设置该SurfaceView自己不维护缓冲surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);}}@TargetApi(Build.VERSION_CODES.GINGERBREAD)@SuppressLint("NewApi")private void initCamera() {if (!isPreview) {int cameraCount = 0;Camera.CameraInfo cameraInfo = new Camera.CameraInfo();cameraCount = Camera.getNumberOfCameras(); // get cameras numberif (cameraCount == 1) {// camera = Camera.open();// 调用Camera的open()方法打开相机。Log.e("TAG", "无前置摄像头");} else {Log.e("TAG", "__________4");for (int camIdx = 0; camIdx < cameraCount; camIdx++) {Camera.getCameraInfo(camIdx, cameraInfo); // get camerainfoif (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) { // 代表摄像头的方位，目前有定义值两个分别为CAMERA_FACING_FRONT前置和CAMERA_FACING_BACK后置try {camera = Camera.open(camIdx);// 调用Camera的open()方法打开相机。} catch (RuntimeException e) {e.printStackTrace();}}}}}if (camera != null && !isPreview) {try {camera.setPreviewDisplay(surfaceHolder);} catch (IOException e) {e.printStackTrace();}// 开始预览camera.startPreview();isPreview = true;}}public PictureCallback myjpegCallback = new PictureCallback() {@SuppressLint("SimpleDateFormat")public void onPictureTaken(byte[] data, Camera camera) {Log.e("TAG", "拍照成功");// 重置声音manager.setStreamVolume(AudioManager.STREAM_SYSTEM, volumn,AudioManager.FLAG_ALLOW_RINGER_MODES);// 根据拍照所得的数据创建位图final Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,data.length);if (ExistSDCard()) {picPath = Constants.HEAD_PIC_PATH+ new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()) + ".jpg";File file = new File(picPath);FileOutputStream outStream = null;try {// 打开指定文件对应的输出流outStream = new FileOutputStream(file);// 把位图输出到指定文件中Matrix matrix = new Matrix();Bitmap bm = Bitmap.createBitmap(1200,1200 * bitmap.getHeight() / bitmap.getWidth(),Config.ARGB_8888);// 固定所拍相片大小matrix.setScale((float) bm.getWidth() / (float) bitmap.getWidth(),(float) bm.getHeight() / (float) bitmap.getHeight());// 注意参数一定是float哦Canvas canvas = new Canvas(bm);// 用bm创建一个画布// 可以往bm中画入东西了canvas.drawBitmap(bitmap, matrix, null);bm.compress(CompressFormat.JPEG, 40, outStream);outStream.close();} catch (IOException e) {e.printStackTrace();}} else {Log.e("TAG", "SD卡不可用");}camera.stopPreview();camera.startPreview();isPreview = true;MyApplication.getInstance().setUser_pic_path(picPath);context.cameraRefresh(picPath);}};public static boolean ExistSDCard() {if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) {return true;} elsereturn false;}}

布局文件看一下

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/new_build_resize_layout"
android:background="#ffffff"
android:layout_width="match_parent"
android:layout_height="match_parent" >



<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:orientation="vertical"
android:paddingLeft="10dp"
android:paddingRight="10dp"
tools:ignore="UselessParent" >



<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="50dp">

<SurfaceView
android:id="@+id/sView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ffffff"/>

</RelativeLayout>


<EditText
android:id="@+id/et_pwd"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="@string/please_enter_a_password"
android:inputType="number"
android:maxLength="@integer/edit_length"
android:password="true"
tools:ignore="Deprecated" >


<requestFocus />
</EditText>


<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >


<CheckBox
android:id="@+id/ckb_show_pwd"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/show_pwd" />
</LinearLayout>
</LinearLayout>


<LinearLayout
android:id="@+id/next_step_linear"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="50dp"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp" >


<Button
android:id="@+id/next_step"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/new_build_safe_box_new_step_button" />
</LinearLayout>


</RelativeLayout>