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

I think you can getRunninTasks on Android and check with your packagename if the task is running or not.

public boolean isServiceRunning() { 

ActivityManager activityManager = (ActivityManager)Monitor.this.getSystemService (Context.ACTIVITY_SERVICE); 
List<RunningTaskInfo> services = activityManager.getRunningTasks(Integer.MAX_VALUE); 
isServiceFound = false; 
for (int i = 0; i < services.size(); i++) { 
    if (services.get(i).topActivity.toString().equalsIgnoreCase("ComponentInfo{com.lyo.AutoMessage/com.lyo.AutoMessage.TextLogList}")) {
        isServiceFound = true;
    }
} 
return isServiceFound; 
} 

Answer 2

With Android Architecture Components it is quite straight forward to check this

annotationProcessor 'android.arch.lifecycle:compiler:1.1.1'
implementation 'android.arch.lifecycle:extensions:1.1.1'

The lifecycle observer class, keeping a pref flag

public class AppLifecycleObserver implements LifecycleObserver {

public static final String TAG = "AppLifecycleObserver";

@OnLifecycleEvent(Lifecycle.Event.ON_START)
void onEnterForeground() {
    Log.d(TAG, "onEnterForeground");
    PreferencesUtils.save(Constants.IN_FOREGROUND, true);
}

@OnLifecycleEvent(Lifecycle.Event.ON_STOP)
void onEnterBackground() {
    Log.d(TAG, "onEnterBackground");
    PreferencesUtils.save(Constants.IN_FOREGROUND, false);
  }
}

Application Class observers the lifecycle

public class App extends Application {


private static App instance;

public static App getInstance() {
    return instance;
}

@Override
public void onCreate() {
    super.onCreate();

    AppLifecycleObserver appLifecycleObserver = new AppLifecycleObserver();
    ProcessLifecycleOwner.get().getLifecycle().addObserver(appLifecycleObserver);
}

Now, you can use the Pref flag to check anywhere you please.