Check if Activity is running from Service

Question

How can a Service check if one of it\'s application\'s Activity is running in foreground?

Answer 1

Erian has the correct answer, but its not safe to use "getDefaultSharedPreferences". When you start a Service it use a differente instance that the Activity. Any changes of preferences in the activity, doesnt update the default shared preferences in the Service. So i will change Erian code with ".getSharedPreferences" like this:

In Activity:

    @Override
    public void onPause() {
        super.onPause();
        getApplicationContext().getSharedPreferences("preferences", MODE_MULTI_PROCESS).edit().putBoolean("isActive", false).commit();;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        getApplicationContext().getSharedPreferences("preferences", MODE_MULTI_PROCESS).edit().putBoolean("isActive", false).commit();
    }

    @Override
    public void onResume() {
        super.onResume();
        getApplicationContext().getSharedPreferences("preferences", MODE_MULTI_PROCESS).edit().putBoolean("isActive", false).commit();
    }

In Service:

    if (getApplicationContext().getSharedPreferences("preferences", MODE_MULTI_PROCESS).getBoolean("isActive", false)) {
        return;
    }