打开相机 led灯，作为手电筒

For this you should do like :

Check whether flash light isavailable or not ?
If yes then Turn Off/On
If no then you can do whatever according to your app.needs

For Checking availability of flash in device:

You can use the following

context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)

which will return true if a flash is available, false if not.

See http://developer.android.com/reference/android/content/pm/PackageManager.html for more information.

Camera mCamera = null;
boolean mbTorchEnabled = false;

public void openflashlight(View v) {// Here are class declarationsCamera.Parameters mParameters;if (mCamera == null)mCamera = Camera.open();// This one is inside my OnClickListenerif (v.getId() == R.id.flashlight) {mParameters = mCamera.getParameters();if (mbTorchEnabled) {mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);mCamera.stopPreview();mCamera.release();mCamera = null;} else {mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);mCamera.setParameters(mParameters);mCamera.startPreview();}mbTorchEnabled = !mbTorchEnabled;}}

<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />

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