WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON后让设备变暗并关闭电源时遇到问题。我已经建立了一个摄录机，并且在录制时我不希望屏幕关闭，所以我使用了WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON，它的工作正常。问题是，在录制后（仍然处于相同的活动中），我想将设备设置为先前的状态（几秒钟后变暗，几秒钟后又完全关闭）。我遵循此android代码：
https://developer.android.com/training/scheduling/wakelock.html
及其使用getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)的说法，但是什么也没有发生，并且屏幕一直保持打开状态。
任何人都知道如何关闭屏幕吗？
这是我的代码：
private View.OnClickListener startRecord=new View.OnClickListener() {
@Override
public void onClick(View v) {
if (isRecording) {
// stop recording and release camera
mMediaRecorder.stop(); // stop the recording
releaseMediaRecorder(); // release the MediaRecorder object
mCamera.lock(); // take camera access back from MediaRecorder
// inform the user that recording has stopped
isRecording = false;
videoV.setAlpha(1f);
videoV.setClickable(true);
videoX.setAlpha(1f);
videoX.setClickable(true);
toggleRecord.setAlpha(0f);
toggleRecord.setClickable(false);
timerCountDown.cancel();//chancel timer counter
animationCountDown.cancel();//chancel animation counter
videoCountDown.setText("");
videoCounterFrame.setBackgroundColor(Color.parseColor("#00000000")); // set counter alpha to 0
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); // after recording, allow screen turn off
} else {
// initialize video camera
if (prepareVideoRecorder()) {
// Camera is available and unlocked, MediaRecorder is prepared,
// now you can start recording
toggleRecord.setImageResource(R.drawable.vidcam_stop);
mMediaRecorder.start();
// inform the user that recording has started
isRecording = true;
videoCounterFrame.setBackgroundColor(Color.parseColor("#30000000"));//set alpha to 0.3
//init two animations- first change animation from white to red and second the opposite
final ValueAnimator colorAnimation = ValueAnimator.ofObject(new ArgbEvaluator(), Color.parseColor("#ffffff"), Color.parseColor("#f50f2b"));
colorAnimation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animator) {
videoCountDown.setTextColor((Integer)animator.getAnimatedValue());
}
});
final ValueAnimator colorAnimation2 = ValueAnimator.ofObject(new ArgbEvaluator(), Color.parseColor("#f50f2b"), Color.parseColor("#ffffff"));
colorAnimation2.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animator) {
videoCountDown.setTextColor((Integer)animator.getAnimatedValue());
}
});
//start both counters
timerCountDown=new CountDownTimer(121000, 100) {
public void onTick(long millisUntilFinished) {
Log.i("millis",millisUntilFinished+"");
if(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished)>0){
videoCountDown.setText(String.format("%d:%02d",
TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished),
TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))));
}else{
videoCountDown.setText((millisUntilFinished-1000)/1000+"");
}
}
public void onFinish() {
videoCountDown.setText("0");
toggleRecord.performClick();
}
}.start();
animationCountDown=new CountDownTimer(121000, 600) {
public void onTick(long millisUntilFinished) {
if(animationColorChange){
colorAnimation.start();
animationColorChange=false;
}else{
colorAnimation2.start();
animationColorChange=true;
}
}
@Override
public void onFinish() {
animationColorChange=true;
}
}.start();
} else {
// prepare didn't work, release the camera
releaseMediaRecorder();
// inform user
}
}
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); // screen never goes to sleep while recording
}
};
我在使用WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON后允许设备变暗并关闭电源时遇到问题。我已经建立了一个摄录机，并且在摄录时我不希望屏幕转动...