I am trying to modify my firebase database when my app is destroyed, that means when I remove the app from the list of recent running app or when I click on Home button ,but I don't know how to do this, I tried to do that in onDestroy() method of every activity but it doesn't work.
This is my onDestroy() method :
@Override
protected void onDestroy() {
super.onDestroy();
FirebaseDatabase.getInstance().getReference().child("users").child(encodeEmail(mAuth.getCurrentUser().getEmail())).child("status")
.setValue("destroyed") ;
/*Toast.makeText(ContactsActivity.this,"closing app",Toast.LENGTH_LONG).show();
MyApp app = (MyApp)getApplication() ;
app.setUpBeforeClosing();*/
}
Do not count on this method being called as a place for saving data! For example, if an activity is editing data in a content provider, those edits should be committed in either onPause() or onSaveInstanceState(Bundle), not here. This method is usually implemented to free resources like threads that are associated with an activity, so that a destroyed activity does not leave such things around while the rest of its application is still running. There are situations where the system will simply kill the activity's hosting process without calling this method (or any others) in it, so it should not be used to do things that are intended to remain around after the process goes away.
Either use OnPause or Use a service to write data.
Add this in manifest
<service
android:name="com.myapp.MyService"
android:stopWithTask="false" />
Now in your MyService service, override method onTaskRemoved. (This will be fired only if stopWithTask is set to false).
public void onTaskRemoved(Intent rootIntent) {
//save data to firebase
//stop service
stopSelf();
}