android 手电筒开发

来源：互联网发布：手机淘宝免费开店流程编辑：程序博客网时间：2024/05/16 09:57

这是我的第一篇博文，希望大家喜欢和支持，看了别人很多博文以后，感觉那些技术大牛的博文都写的非常好，才开始决定自己也好写一写，让自己对已经掌握的东西系统的分析一遍，提高自己的表达能力。

先手先讲一下为什么要开发这个手电筒功能，因为网上很多手电筒功能都会有自动推送消息和自动联网的功能，对使用手机的消费者不好。公司才临时决定开发一个这样的功能，也是我第一个用于量产的功能。

我在做开发之前，在网上看了很多资料，下载了一些源码供自己使用。看了网上的手电筒都实现了些什么功能。然后把网上的手电筒功能反编译出来得到要使用到的图片资源。

我在网上找资料主要是让自己知道怎么打开闪光灯功能和背光亮度的调节还有怎么实现上下左右的滑动。

最后自己选择了用发送消息打开闪关灯的办法：

通过上下滑动来控制手电筒的开和关，是通过实现 OnGestureListener 接口的 onScroll 方法。通过实现 OnTouchListener 接口的 onTouch 方法来建立 GestureDetector 对象同FlashLightActivity 的联系。

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package net.seete.android.FlashLight;
import android.R.string;
import android.app.Activity;
import android.content.ContentResolver;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.os.Handler;
import android.provider.Settings;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
public class FlashLightActivity extends Activity implements OnTouchListener,OnGestureListener{
/** Called when the activity is first created. */
private static final String TAG = "FlashLightActivity";
private static final boolean DEBUG = false;
private static final int MAXIMUM_BACKLIGHT = 255;
private int curBrightnessValue;
private GestureDetector mGestureDetector;
private Camera camera;
private int isOpen = 0;
private String flashState = null; // 代表没有闪光灯
private ImageView flashLightBG;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (DEBUG){
Log.d(TAG,"onCreate");
}
camera = Camera.open();
Parameters params = camera.getParameters();
flashState=params.getFlashMode();
if (flashState == null){
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
}
setContentView(R.layout.main);
if (DEBUG){
Log.d(TAG,"onCreate="+params.getFlashMode());
}
if (flashState != null){
mGestureDetector = new GestureDetector(this);
flashLightBG = (ImageView)findViewById(R.id.background);
flashLightBG.setOnTouchListener(this);
flashLightBG.setLongClickable(true);
}else{
curBrightnessValue = getScreenBrightness(this);
stopAutoBrightness(this);
flashLightBG = (ImageView)findViewById(R.id.background);
}
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
if (DEBUG){
Log.d(TAG,"onBackPressed");
}
if (camera != null) {
camera.release();
camera = null;
}
super.onBackPressed();
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
if (DEBUG){
Log.d(TAG,"onPause->curBrightnessValue="+curBrightnessValue);
}
if (flashState != null){
flashLightBG.setImageResource(R.drawable.bg_off);
}else{
Log.d(TAG,"onPause->curBrightnessValue="+curBrightnessValue);
mHandler.removeMessages(isOpen);
setBrightness(this, curBrightnessValue);
}
if (camera != null) {
if (isOpen==0){
closeFlashLight();
isOpen=0;
}
}
super.onPause();
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
if (DEBUG){
Log.d(TAG,"onStop");
}
if (camera != null) {
camera.release();
camera = null;
}
finish();
super.onStop();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
//flashLightBG.setImageResource(R.drawable.bg_on);
if (DEBUG){
Log.d(TAG,"onResume->isOpen="+isOpen);
}
if (flashState != null){
mHandler.sendEmptyMessage(isOpen);
}else{
mHandler.sendEmptyMessageDelayed(isOpen, 2000);
}
super.onResume();
}
public boolean onDown(MotionEvent e) {
// TODO Auto-generated method stub
if (DEBUG){
Log.d(TAG,"onDown");
}
return false;
}
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
if (DEBUG){
Log.d(TAG,"onFling");
}
// TODO Auto-generated method stub
return false;
}
public void onLongPress(MotionEvent e) {
if (DEBUG){
Log.d(TAG,"onLongPress");
}
// TODO Auto-generated method stub
}
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY) {
// TODO Auto-generated method stub
if (DEBUG){
Log.d(TAG,"onScroll");
}
float y1 = e1.getY(), y2 = e2.getY();
if (y1 -y2 > 20) {
if (isOpen==1) {
//向上滑动发送打开闪光灯消息
mHandler.sendEmptyMessage(0);
}
Log.d(TAG, "To UP" + "(" + y1
+ "," + y2 + ")");
return (true);
} else if (y1 - y2 < -20) {
if (isOpen==0) {
//向下滑动发送关闭闪光灯消息
mHandler.sendEmptyMessage(1);
}
Log.d(TAG, "To Down" + "(" + y1
+ "," + y2 + ")");
return (true);
}
return false;
}
public void onShowPress(MotionEvent e) {
// TODO Auto-generated method stub
if (DEBUG){
Log.d(TAG,"onShowPress");
}
}
public boolean onSingleTapUp(MotionEvent e) {
// TODO Auto-generated method stub
if (DEBUG){
Log.d(TAG,"onSingleTapUp");
}
return false;
}
Handler mHandler = new Handler() {
public void handleMessage(android.os.Message msg) {
if (DEBUG){
Log.d(TAG,"handleMessage");
}
switch (msg.what) {
case 0:
openFlashLight();
isOpen = 0;
break;
case 1:
closeFlashLight();
isOpen = 1;
break;
}
};
};
public void openFlashLight(){
if (flashState != null){
//用于显示手电筒开时的背景
flashLightBG.setImageResource(R.drawable.bg_on);
}else{
//当没有闪光灯时，用背光做光源，并且把背光调到最亮
setBrightness(this, MAXIMUM_BACKLIGHT);
}
Parameters params = camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_TORCH); // 持续的亮灯，FLASH_MODE_ON
camera.setParameters(params);
}
public void closeFlashLight(){
if (flashState != null){
//用于显示手电筒关时的背景
flashLightBG.setImageResource(R.drawable.bg_off);
}
Parameters params_2 = camera.getParameters();
params_2.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(params_2);
}
/** * 设置亮度 */
public static void setBrightness(Activity activity, int brightness) {
// Settings.System.putInt(activity.getContentResolver(),
// Settings.System.SCREEN_BRIGHTNESS_MODE,
// Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
WindowManager.LayoutParams lp = activity.getWindow().getAttributes();
lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);
activity.getWindow().setAttributes(lp);
}
/** * 停止自动亮度调节 */
public static void stopAutoBrightness(Activity activity)
{
Settings.System.putInt(activity.getContentResolver(),
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
}
/** * 获取屏幕的亮度 */
public static int getScreenBrightness(Activity activity)
{
int nowBrightnessValue = 0;
ContentResolver resolver = activity.getContentResolver();
try {
nowBrightnessValue = android.provider.Settings.System.getInt(
resolver, Settings.System.SCREEN_BRIGHTNESS); }
catch (Exception e) {
e.printStackTrace();
}
return nowBrightnessValue;
}
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
Log.d(TAG,"onTouch");
return mGestureDetector.onTouchEvent(event);
}
}

把源码贴给大家看吧，有什么问题，大家就说啊，我也不知道怎么说。谢谢大家支持。

再给大家附上整个源码的网址：http://download.csdn.net/detail/azhuoazhuo/4789564 点击打开链接

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