check android application is in foreground or not? [duplicate]

Answer 1

I've found a simple soluition for this by creating a base activity class , u must extend all your activity classes from this :

public class BaseActivity extends ActionBarActivity {

@Override
protected void onResume() {
    ApplicationStateChecker.view_resumed(this);
    super.onResume();
}

@Override
protected void onStop() {
    ApplicationStateChecker.view_stopped(this);
    super.onStop();

}

@Override
protected void onPause() {
    ApplicationStateChecker.view_paused(this);
    super.onPause();

}

}

ApplicationStateChecker class :

public class ApplicationStateChecker {

private  static final String _pause_string = "paused";
private  static final String _resume_string = "resumed";

private static String _view_lastState;
private static boolean _from_background = true;

public static void view_paused(Activity activity){
    _view_lastState = _pause_string;
}

public static void view_stopped(Activity activity){

    if (  _view_lastState.equals(_pause_string) ){
        //if stop called and last event was pause then app is brought to background
        _from_background = true;
    }  //if

}

public static void view_resumed(Activity activity){

    if (  _from_background ) {
       //Do your stuff here , app is brought to foreground 

    }  //if

    _from_background = false;
    _view_lastState = _resume_string;
}

Answer 2

Below is updated solution for the latest Android SDK.

String PackageName = context.getPackageName();
        ActivityManager manager = (ActivityManager) context.getSystemService(ACTIVITY_SERVICE);
        ComponentName componentInfo;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
        {
            List<ActivityManager.AppTask> tasks = manager.getAppTasks();
            componentInfo = tasks.get(0).getTaskInfo().topActivity;
        }
        else
        {
            List<ActivityManager.RunningTaskInfo> tasks = manager.getRunningTasks(1);
            componentInfo = tasks.get(0).topActivity;
        }

        if (componentInfo.getPackageName().equals(PackageName))
            return true;
        return false;

Hope this helps, thanks.

Answer 3

Android Architecture Components library you can use the ProcessLifecycleOwner to set up a listener to the whole application process for onStart and onStop events. To do this, make your application class implement the LifecycleObserver interface and add some annotations for onStart and onStop to your foreground and background methods.

class ArchLifecycleApp : Application(), LifecycleObserver {

    override fun onCreate() {
        super.onCreate()
        ProcessLifecycleOwner.get().lifecycle.addObserver(this)
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    fun onAppBackgrounded() {
        Log.d("Awww", "App in background")
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_START)
    fun onAppForegrounded() {
        Log.d("Yeeey", "App in foreground")
    }

}