Android detect phone lock event

Question

I want to be able to detect the phone lock event. When my app is running, if I press the red button (call end button/power button), the phone gets locked and the screen goes blank. I want to be able to detect this event, is it possible?

score 37 · Answer 1 · edited Aug 30 '16 at 10:54

37

Alternatively you could do this:

@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...
    }
}

edited Aug 30 '16 at 10:54

Volodymyr Yatsykiv

3,181
1
24
28

answered Sep 07 '11 at 09:52

Robert

37,670
37
171
213

Do you need to add a permission to the application manifest for this one? – pqn Jul 08 '12 at 03:52
1

Tried this, and no need to add permission – HVNSweeting Jul 09 '12 at 01:52
2

I think this only check whether screen-on or not, not check the lock. This can mix with FLAG_KEEP_SCREEN_ON, so the screen-off only when you lock screen. http://developer.android.com/reference/android/os/PowerManager.html#isScreenOn() what about check unlocked ? (not screen-on) – HVNSweeting Jul 09 '12 at 01:57
the answer here http://stackoverflow.com/questions/3462843/android-what-happens-when-device-is-unlocked – HVNSweeting Jul 09 '12 at 02:03
2

User isInteractive () instead of isScreenOn() for API 20 onwards – Najeebullah Shah Jan 12 '15 at 19:07
How would I check if the device is locked, when in live wallpaper? – android developer Feb 25 '20 at 09:25

score 18 · Accepted Answer · edited May 23 '17 at 11:54

18

Have a Broadcast Receiver

android.intent.action.SCREEN_ON

and

android.intent.action.SCREEN_OFF

Related: Read CommonsWare's Answer Here.

edited May 23 '17 at 11:54

Community

1
1

answered Jul 03 '10 at 07:21

st0le

33,375
8
89
89

19

For the record -- lock off/on is not the same event as screen off/on. – greenoldman Oct 02 '12 at 17:00
2

Screen Off will occurr even of tje screen goes off when making a phone call – Apr 06 '14 at 06:35
Here's an example of this not catching the lock screen: on Android 5, if I switch users, the OS goes to the lock screen without turning the screen off. – Sam Feb 22 '15 at 04:18
Can we disable SCREEN_OFF event when making a phone call ? – Mehul Ranpara May 20 '15 at 13:48
Another issue with this is: if the screen automatically turns of after the phone is left idle, the phone might not lock until 5 seconds afterwards. The broadcast is sent on screen off rather than on phone lock. – Sam Sep 30 '17 at 23:07
Locking can occur without screen_off event, for example, if device is locked via device admin. – artem Oct 25 '17 at 16:44

score 0 · Answer 3 · answered Mar 31 '21 at 07:59

0

Register a broadcast with IntentFilter filter.addAction(Intent.ACTION_USER_PRESENT)

works pretty well even screen is turned on/off

answered Mar 31 '21 at 07:59

Khalid Lakhani

179
2
10

No. It is not reliable. Does not get fired on some devices. – Michał Dobi Dobrzański Jan 24 '23 at 14:07

score 0 · Answer 4 · answered Jul 15 '22 at 08:18

Koltin format of Robert's solution.

 override fun onPause() {
        super.onPause()

        // If the screen is off then the device has been locked
        val powerManager = getSystemService(POWER_SERVICE) as PowerManager
        val isScreenOn: Boolean = powerManager.isInteractive
        
        if (!isScreenOn) {
            // The screen has been locked 
            // do stuff...
        }
    }

I am assuming Kitkat version is quite old already.

Android detect phone lock event

4 Answers4

Linked

Related