Android(安卓)手电筒（最强适配版）

网上很多手电筒的代码，然后整理了下

使用：不停的调用onAndoff就能开和关手电筒

isopen是开关状态，比如你可以用他来判断手电是否打开。

可以看到使用了单例模式和线程同步，原因是你只有一个灯泡。

那边看代码，边看注释吧

public class Flash {private static Flash mFlash;private static Camera mCamera = null;private static Camera.Parameters mCameraParameters;private static String previousFlashMode = null;private static boolean isOpen = false;private Flash() {}public static Flash getInstance() {if (mFlash == null) {mFlash = new Flash();}return mFlash;}public synchronized void open(Context context) {if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)) {//这里的判断证实是没有用的，不能用来判断手机是否有灯泡，已经加了我就再没删try {mCamera = Camera.open();mCamera.setPreviewTexture(new SurfaceTexture(0));//这一句话很重要，不加的话在nexus 5上灯泡不亮} catch (Exception e) {close();String mString = context.getApplicationContext().getResources().getString(R.string.device_unable);Toast.makeText(context.getApplicationContext(), mString,Toast.LENGTH_LONG).show();//这里是打不开的情况，比如别人正在使用的灯泡，打不开用一个close关一次，下次就能打开了。}} else {Toast.makeText(context,context.getString(R.string.device_cannot_find),Toast.LENGTH_LONG).show();return;}if (mCamera != null) {mCameraParameters = mCamera.getParameters();previousFlashMode = mCameraParameters.getFlashMode();}if (previousFlashMode == null) {// could be null if no flash, i.e. emulatorpreviousFlashMode = Camera.Parameters.FLASH_MODE_OFF;}}public synchronized void close() {//关灯，就是用完之后清除一下camera对象，不然会影响其他设备的正常使用if (mCamera != null) {mCameraParameters.setFlashMode(previousFlashMode);mCamera.setParameters(mCameraParameters);mCamera.release();mCamera = null;isOpen = false;}}public synchronized void onAndOff(Context context) {//开\关都在这里调try {if (isOpen) {off();} else if (!isOpen) {on(context);}// send broadcast for widget//调完之后可以通知界面更新} catch (RuntimeException e) {Toast.makeText(context, R.string.device_unavailable,Toast.LENGTH_SHORT).show();}}public synchronized void on(Context context) {if (mCamera == null) {open(context);}if (mCamera != null) {mCameraParameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);mCamera.setParameters(mCameraParameters);mCamera.startPreview();isOpen = true;}}public synchronized void off() {if (mCamera != null) {mCamera.stopPreview();mCameraParameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);mCamera.setParameters(mCameraParameters);isOpen = false;}close();}public boolean isOpen() {return isOpen;}public void setOpen(boolean isOpen) {Flash.isOpen = isOpen;}}

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