CODEWITHSUNDEEP
androidandroid-activityandroid-notifications
borges
borges

Reputation: 3687

Identify that the lock screen was unlocked

I want to launch a Notification in my app in a specific situation only when a certain Activity is not visible.

I managed to do it doing the bind/unbind of the Service when I create and destroy the Activity (using onCreate/onDestroy) e saving in a boolean if this Activity is visible through onPause/onResume methods, as the following code bellow shows:

public void onCreate(Bundle savedInstanceState) {
    // ...
    bindService(...);
}

public void onDestroy() {
    // ...
    unbindService(mConnection);
}

public void onResume() {
    // ...
    // this method sets to true the Service's boolean which retain Activity's visibility.
    mService.registerActivity(true);
}

public void onPause() {
    mService.registerActivity(false);
}

And on the Service, I check this boolean to launch the Notification.

It works for all the cases except in a specific one: when the app is opened in this Activity but the lock screen is enabled.

By some tests I've made, when the lock screen appears, the Activity.onPause method is called. I was hoping that the Activity.onResume method was just called when the lock screen was unlocked, but that's not what happens. When I press the power button to summon the lock screen, the Activity.onResume method is called already. In this sense, what I am doing is not right.

How can I make the Activity.onResume method to be called only when the user unlock the lock screen? Or... how can I identify that the lock screen was unlocked and the user is REALLY looking at the Activity?

Upvotes: 0

Views: 1520

Answers (2)

techi.services
techi.services

Reputation: 8533

Activity.onWindowFocusChanged(boolean hasFocus) should return true every time your Activity regains focus after the screen is unlocked.

Upvotes: 5

Wijnand Wieskamp
Wijnand Wieskamp

Reputation: 65

2 thoughts, untested and i'm still kind of an android noob :

ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
List<RunningAppProcessInfo> list2 = am.getRunningAppProcesses();

Then, filter your Activity from this list and check the importance property of it. Front running apps it's 100, don't know if it's still 100 when a lock screen is in front of it.

Or, you could create a running process what checks ever x seconds if the screen was locked, and, does something when it's unlocked again.

Upvotes: 0

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