66  

I believe that those actions can only be received by receivers registered in Java code (via registerReceiver()) rather than through receivers registered in the manifest.

我相信这些操作只能由在Java代码中注册的接收者（通过registerReceiver（））而不是通过清单中注册的接收者来接收。

28  

Alternatively you can use the power manager to detect screen locking.

或者，您可以使用电源管理器来检测屏幕锁定。

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

    // If the screen is off then the device has been locked
    PowerManager powerManager = (PowerManager) getSystemService(POWER_SERVICE);
    boolean isScreenOn;
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) {
        isScreenOn = powerManager.isInteractive();
    } else {
        isScreenOn = powerManager.isScreenOn();
    }

    if (!isScreenOn) {

        // The screen has been locked 
        // do stuff...
    }
}

27  

"android.intent.action.HEADSET_PLUG"
"android.intent.action.ACTION_SCREEN_ON"
"android.intent.action.ACTION_SCREEN_OFF"

Three of them above, They cannot register using Manifest. Android core added "Intent.FLAG_RECEIVER_REGISTERED_ONLY" to them (maybe.. I checked codes only in case of "HEADSET_PLUG".

其中三个，他们无法使用Manifest注册。 Android核心向他们添加了“Intent.FLAG_RECEIVER_REGISTERED_ONLY”（也许..我只检查了代码“HEADSET_PLUG”）。

So, We should use "dynamic register". Like below...

所以，我们应该使用“动态寄存器”。如下......

private BroadcastReceiver mPowerKeyReceiver = null;

private void registBroadcastReceiver() {
    final IntentFilter theFilter = new IntentFilter();
    /** System Defined Broadcast */
    theFilter.addAction(Intent.ACTION_SCREEN_ON);
    theFilter.addAction(Intent.ACTION_SCREEN_OFF);

    mPowerKeyReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String strAction = intent.getAction();

            if (strAction.equals(Intent.ACTION_SCREEN_OFF) || strAction.equals(Intent.ACTION_SCREEN_ON)) {
                // > Your playground~!
            }
        }
    };

    getApplicationContext().registerReceiver(mPowerKeyReceiver, theFilter);
}

private void unregisterReceiver() {
    int apiLevel = Build.VERSION.SDK_INT;

    if (apiLevel >= 7) {
        try {
            getApplicationContext().unregisterReceiver(mPowerKeyReceiver);
        }
        catch (IllegalArgumentException e) {
            mPowerKeyReceiver = null;
        }
    }
    else {
        getApplicationContext().unregisterReceiver(mPowerKeyReceiver);
        mPowerKeyReceiver = null;
    }
}

4  

The way I implemented this is by registering the receiver in my main activity in onCreate(), just define the receiver somewhere beforehand:

我实现这个的方法是在onCreate（）的主要活动中注册接收器，只需事先在某处定义接收器：

    lockScreenReceiver = new LockScreenReceiver();
    IntentFilter lockFilter = new IntentFilter();
    lockFilter.addAction(Intent.ACTION_SCREEN_ON);
    lockFilter.addAction(Intent.ACTION_SCREEN_OFF);
    lockFilter.addAction(Intent.ACTION_USER_PRESENT);
    registerReceiver(lockScreenReceiver, lockFilter);

And then onDestroy():

然后onDestroy（）：

    unregisterReceiver(lockScreenReceiver);

In receiver you must catch the following cases:

在接收器中，您必须捕获以下情况：

public class LockScreenReceiver extends BroadcastReceiver
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
        if (intent != null && intent.getAction() != null)
        {
            if (intent.getAction().equals(Intent.ACTION_SCREEN_ON))
            {
                // Screen is on but not unlocked (if any locking mechanism present)
            }
            else if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF))
            {
                // Screen is locked
            }
            else if (intent.getAction().equals(Intent.ACTION_USER_PRESENT))
            {
                // Screen is unlocked
            }
        }
    }
}