Question

When using flag FLAG_ACTIVITY_NEW_TASK, if a task is already running for the activity you are now starting, I want a new activity to not be started – instead, I want the current task to simply be brought to the front of the screen it was last in.

1. How can I do it from service of other app? I would like to launch app which is in actvityManager.getRunningAppProcesses() by service. I know how to start this app only as a new one:

   Context context = this.getBaseContext();
   

   PackageManager pm = context.getPackageManager();
   Intent intent = pm.getLaunchIntentForPackage(LevelappPackageName);
   context.startActivity(intent);

But I would like to perfom it this way:

    context.startActivity(intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK));

1. I know how to find out if my app is running:

   ActivityManager actvityManager = (ActivityManager) this.getSystemService( ACTIVITY_SERVICE );
   List<RunningAppProcessInfo> App = actvityManager.getRunningAppProcesses();
   for(int i = 0; i < App.size(); i++)
       {   
           if(App.get(i).processName.equals("myapp"))
   

   But how can I know if some app is currently running – it is on screen at this moment?!

Answer 1

You will need to add an intent-filter action to the manifest of the Activity you wish to start. You will also need a PendingIntent with the correct action that you can send from the Service. You may also need to look the manifest launchMode=singleTop and/or Context.startActivityIfNeeded.

If an Activity has focus its onWindowFocusChanged method will be called. Use that to set a variable you can read.