android：靠近脸部时关闭屏幕
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android: turn off screen when close to face
提问by mtmurdock
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.
我的应用程序允许用户访问他们的公司语音邮件。通常，在通话过程中，当用户将设备放在耳边时，屏幕会关闭，这样他们就不会不小心用脸按下按钮。当用户收听他们的语音邮件时，我想让我的应用程序做同样的事情。
anyone know how to do this?
有人知道怎么做吗？
采纳答案by CommonsWare
What you are seeing is the use of a proximity sensor. For devices that have one, you access it through SensorManager.
您所看到的是接近传感器的使用。对于有一个的设备，您可以通过 访问它SensorManager。
回答by Dre
If you are allowed to look at open source code without causing yourself problems, check the source of the Android Phone Application. Specifically src/com/android/phone/PhoneApp.javaand src/com/android/phone/InCallScreen.java.
如果您可以查看开源代码而不会给自己带来问题，请检查Android Phone 应用程序的来源。特别是src/com/android/phone/PhoneApp.java和src/com/android/phone/InCallScreen.java。
From src/com/android/phone/PhoneApp.java:
来自 src/com/android/phone/PhoneApp.java：
//Around line 519
// 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,
LOG_TAG);
}
....
// Around line 1334
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();
} else {
if (VDBG) Log.d(LOG_TAG, "updateProximitySensorMode: lock already held.");
}
} else {
// 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.
此外，如果您查看 PowerManager 类的代码，PROXIMITY_SCREEN_OFF_WAKE_LOCK 已记录（但隐藏）并且应该执行您想要的操作（但是，我不确定这适用于哪个 API 级别）——但由于某种原因不在表中.
/**
* 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.
*
* {@hide}
*/
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.
如果您不害怕使用潜在的未记录功能，它应该完全满足您的需求。
回答by guness
as of API level 21 (Lollipop) you can get proximity wake lock this just like that:
从 API 级别 21 (Lollipop) 开始，您可以像这样获得接近唤醒锁定：
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 wakeLock;
} else {
return null;
}
}
then it is up to you to acquire and release the lock.
然后由您来获取和释放锁。
PS: PowerManager#getSupportedWakeLockFlagswas hidden, but now exists nomore. They have invented isWakeLockLevelSupportedinstead.
PS： PowerManager#getSupportedWakeLockFlags被隐藏，但现在不存在了。他们发明了isWakeLockLevelSupported。
回答by rac2030
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 http://code.google.com/p/speakerproximity/
可能您不再需要它了，但是对于那些对代码感兴趣的人，您可以在http://code.google.com/p/speakerproximity/ 上查看我的 SpeakerProximity 项目
