Camera camera = Camera.open();
Parameters p = camera.getParameters();

	//手电筒闪光开启
	private void processOnFlash(){
		p.setFlashMode(Parameters.FLASH_MODE_TORCH);
		camera.setParameters(p);
		camera.startPreview();
	}
	//手电筒闪光关闭
	private void processOffFlash(){
		p.setFlashMode(Parameters.FLASH_MODE_OFF);
		camera.setParameters(p);
		camera.stopPreview();
	}

注意的是要及时释放Camera

//及时释放
	public void surfaceDestroyed(SurfaceHolder holder) {
		camera.setPreviewCallback(null);
		camera.stopPreview();
		camera.release();
		camera = null;
	}