android 手电筒电源键关闭功能实现

在打开手电筒之后 机器休眠 客户要求点击电源键 手电筒需要关闭
frameworks\base\services\core\java\com\android\server\policy\PhoneWindowManager.java

    @Override
    public void screenTurnedOn() {
        synchronized (mLock) {
            if (mKeyguardDelegate != null) {
                mKeyguardDelegate.onScreenTurnedOn();
            }
            //add start
             if (SystemProperties.getInt("persist.sys.screen_first_on", 1) == 0) {
                android.util.Log.d("chch", "turnOffFlashLightIfNeed");
                turnOffFlashLightIfNeed();
            }else{
                SystemProperties.set("persist.sys.screen_first_on", "0");
            }
            //end
        }
    }
     //chch add start
    private void turnOffFlashLightIfNeed(){
        try{
            mCameraManager = (CameraManager) mContext.getSystemService(Context.CAMERA_SERVICE);
            mCameraId = mCameraManager.getCameraIdList()[0];
            mCameraManager.setTorchMode(mCameraId,false);
        }catch(Exception e){
            android.util.Log.d("chch", "camera error");
        }

    }
    //chch end

前面要增加
import android.hardware.camera2.CameraManager;
增加变量
CameraManager mCameraManager;
String mCameraId;