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

import android.hardware.camera2.CameraManager;

CameraManager mCameraManager; String mCameraId;