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February 22, 2016android: turn off screen when close to face - Stack Overflow
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J it only takes a minute:
My app allows the user to access their corporate voice mail. Normally, durring a phone call when the user holds the device up to their ear, the screen shuts off so they wont accidentally push buttons with their face. I would like to make my app do the same thing when the user is listening to their voice mail.
anyone know how to do this?
5,920174591
What you are seeing is the use of a proximity sensor. For devices that have one, you access it through .
599k8214241492
If you are allowed to look at open source code without causing yourself problems, check the source of the .
Specifically
From src/com/android/phone/PhoneApp.java:
//Around line 423
// Wake lock used to control proximity sensor behavior.
if ((pm.getSupportedWakeLockFlags()
& PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK) != 0x0) {
mProximityWakeLock = pm.newWakeLock(
PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK,
// Around line 1151
if (((state == Phone.State.OFFHOOK) || mBeginningCall)&& !screenOnImmediately) {
// Phone is in use!
Arrange for the screen to turn off
// automatically when the sensor detects a close object.
if (!mProximityWakeLock.isHeld()) {
if (DBG) Log.d(LOG_TAG, "updateProximitySensorMode: acquiring...");
mProximityWakeLock.acquire();
if (VDBG) Log.d(LOG_TAG, "updateProximitySensorMode: lock already held.");
// Phone is either idle, or ringing.
We don't want any
// special proximity sensor behavior in either case.
if (mProximityWakeLock.isHeld()) {
if (DBG) Log.d(LOG_TAG, "updateProximitySensorMode: releasing...");
// Wait until user has moved the phone away from his head if we are
// releasing due to the phone call ending.
// Qtherwise, turn screen on immediately
int flags =
(screenOnImmediately ? 0 : PowerManager.WAIT_FOR_PROXIMITY_NEGATIVE);
mProximityWakeLock.release(flags);
Additionally, if you look at the code for the PowerManager class, PROXIMITY_SCREEN_OFF_WAKE_LOCK is documented (but hidden) and should do what you want ( I am not sure which API level this works for, however ) -- but not in the table for some reason.
* Wake lock that turns the screen off when the proximity sensor activates.
* Since not all devices have proximity sensors, use
* {@link #getSupportedWakeLockFlags() getSupportedWakeLockFlags()} to determine if
* this wake lock mode is supported.
public static final int PROXIMITY_SCREEN_OFF_WAKE_LOCK = WAKE_BIT_PROXIMITY_SCREEN_OFF;
If you aren't afraid of using a potential undocumented feature, it should do exactly what you need.
as of API level 21 (Lollipop) you can get proximity wake lock this just like that:
if(powerManager.isWakeLockLevelSupported(PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK)) {
PowerManager.WakeLock wakeLock = powerManager.newWakeLock(PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK, TAG);
wakeLock.setReferenceCounted(false);
return wakeL
then it is up to you to acquire and release the lock.
PowerManager#getSupportedWakeLockFlags was hidden, but now exists nomore. They have invented isWakeLockLevelSupported instead.
1,90611850
Probably you don't need it anymore but for the ones that are interested in code you could have a look at my SpeakerProximity project at
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screen hangs when try to switch simcard on or off. sim gets on or off in the background but the screens hangs and doesn't com out.
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京ICP备号 | 京公网安备34号 | 京ICP证110507号java - Android Screen OFF / ON - Stack Overflow
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J it only takes a minute:
I need to get my screen turned on/off using SensorEventListener when
public final void onSensorChanged(SensorEvent event) {
if (event.values[0] == 0)
turnScreenOFF();
else if (event.values[0] == 5)
turnScreenON();
I have tried many sample code for it, but I can't get my screen turned ON again after it's turned OFF
There is the code to turn off the screen :
WindowManager.LayoutParams params = getWindow().getAttributes();
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
params.screenBrightness = 0.0f;
getWindow().setAttributes(params);
For screen on-off state, you can try with ACTION_SCREEN_ON and ACTION_SCREEN_OFF intents,which will come in nifty if you’re making an application that might need to save state or respond to the user’s screen going to sleep/waking up, etc.
Check out the
Try out below:
private void unlockScreen() {
Window window = this.getWindow();
window.addFlags(LayoutParams.FLAG_DISMISS_KEYGUARD);
window.addFlags(LayoutParams.FLAG_SHOW_WHEN_LOCKED);
window.addFlags(LayoutParams.FLAG_TURN_SCREEN_ON);
And call this method from onResume().
21.6k84079
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Stack Overflow works best with JavaScript enabledandroid（125）
在做一个程序的时候，需要时刻保持某一服务是启动的，因此想到了通过监听屏幕SCREEN_ON和SCREEN_OFF这两个action。奇怪的是，这两个action只能通过代码的形式注册，才能被监听到，使用AndroidManifest.xml 完全监听不到。查了一下，发现这是PowerManager那边在发这个广播的时候，做了限制，限制只能有register到代码中的receiver才能接收。
那怎么才能保证我的服务一直是启动状态呢，其实还有另一个Action可以反映出用户正在使用手机的行为，每个用户在使用手机的时候，首先按电源键将屏幕点亮，紧接着就是解锁。解锁动作通过android.intent.action.USER_PRESENT发送出来，我们就能识别出该用户进入了home界面，也就能启动我们相应的服务了，不管你是要谈对话框welcome用户，还是后台启动程序升级服务，都可以！以神的名义发誓，该Action在AndroidManifest.xml中可以监听得到。
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