Android，如何在锁定屏幕上启动 Activity

Question

I want launch my activity on push notification over lock screen without change in lock.

Any special permission for that activity?

Answer 1

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1)
    {
        setShowWhenLocked(true);
        setTurnScreenOn(true);
        KeyguardManager keyguardManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
        if(keyguardManager!=null)
            keyguardManager.requestDismissKeyguard(this, null);
    }
    else 
    {
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD |
                WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED |
                WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
    }

Answer 2

After API level 17 this would work

<activity
    android:name=".yourActivityName"
    android:showOnLockScreen="true"
    android:screenOrientation="sensorPortrait" >

or write this in onCreate() before calling setContentView()

getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED); 

Answer 3

The other answers include extra functionality that you may or may not want.

The minimum code to allow your activity to display on the lock screen is this:

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    if (Build.VERSION.SDK_INT >= 27)
        setShowWhenLocked(true);
    else
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);

    // setContentView etc
}

If you also want your activity to turn on the screen (since it might be off) or unlock the keyguard, then see Vladimir Demirev's answer .

Answer 4

In the method onCreate(Bundle savedInstanceState) you should add some window flags:

Window window = this.getWindow();
window.addFlags(LayoutParams.FLAG_DISMISS_KEYGUARD);
window.addFlags(LayoutParams.FLAG_SHOW_WHEN_LOCKED);
window.addFlags(LayoutParams.FLAG_TURN_SCREEN_ON);