检查是否由于屏幕锁定而调用了onPause活动状态

Question

如果我的应用程序正在运行并且按了锁定屏幕按钮，它将把应用程序置于后台。检查屏幕锁定是否调用onPause（）的方法是什么？

Answer 1

All you have to do is check if the screen is on or not.

@Override
protected void onPause() {
    super.onPause();

    PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);

    boolean screenOn;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) {
        screenOn = pm.isInteractive();
    } else {
        screenOn = pm.isScreenOn();
    }

    if (screenOn) {
        // Screen is still on, so do your thing here
    }
}

Answer 2

You Can Simply Know It By Using This Method

@Override
public void onPause() {
super.onPause();  // Always call the superclass method first
System.out.println("On Pause called");
}

For Keeping The Device Awake while lock screen. Documentation.

Ok in your case you would need Wake_Lock

To use a wake lock, the first step is to add the WAKE_LOCK permission to your application's manifest file:

 <uses-permission android:name="android.permission.WAKE_LOCK" /> 

If your app includes a broadcast receiver that uses a service to do some work, you can manage your wake lock through a WakefulBroadcastReceiver , as described in Using a WakefulBroadcastReceiver. This is the preferred approach. If your app doesn't follow that pattern, here is how you set a wake lock directly:

 PowerManager powerManager = (PowerManager) getSystemService(POWER_SERVICE); Wakelock wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyWakelockTag"); wakeLock.acquire(); 

To release the wake lock, call wakelock.release(). This releases your claim to the CPU. It's important to release a wake lock as soon as your app is finished using it to avoid draining the battery.

DO this after setting powermanager.

boolean screenOn;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) {
    screenOn = powerManager.isInteractive();
} else {
    screenOn = powerManager.isScreenOn();
}

if (screenOn) {
    // Screen is still on, so do your thing here
}

Answer 3

You just want to know when onPause is called? You could override the super function and add logging to the function:

@Override
public void onPause() {
  super.onPause();
  System.out.println("On Pause called");
}