<uses-permission android:name="android.permission.FLASHLIGHT" />

<uses-permission android:name="android.permission.CAMERA"/>

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

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

private Parameters parameter=null;

private Camera camera=null;

if(camera == null){

    camera = Camera.open();

}

camera.startPreview();

parameter = camera.getParameters();

parameter.setFlashMode(Parameters.FLASH_MODE_TORCH);

camera.setParameters(parameter);

parameter = camera.getParameters();

parameter.setFlashMode(Parameters.FLASH_MODE_OFF);

camera.setParameters(parameter);