Q:

How to check if an activity is running in background/foreground from a service?

I have created a service which starts from an activity's onCreate and stops on the activity's onDestroy method. Now I have to check from a method of the service that whether the activity is running in foreground/background(for some cases like application is forcefully closed). How can I do that?

I need to do this coz as far I know there is no guarantee of calling onDestroy method of an activity if any the application is forcefully closed or any kind of crash. So, my service which starts when my activity launches won't stop after any crash or any forceful closing event.
I have seen this link where foreground activities can be checked. But I need to check a running activity in whatever state (either foreground or background)

A:

Final Update
To check for all activities:
@Override
protected void onStop() {
super.onStop();

    if (AppConstants.isAppSentToBackground(getApplicationContext())) {
        // Do what ever you want after app close simply Close session

    }
}

Method to check our app is running or not:
public static boolean isAppSentToBackground(final Context context) {

    try {
        ActivityManager am = (ActivityManager) context
                .getSystemService(Context.ACTIVITY_SERVICE);
        // The first in the list of RunningTasks is always the foreground
        // task.
        RunningTaskInfo foregroundTaskInfo = am.getRunningTasks(1).get(0);
        String foregroundTaskPackageName = foregroundTaskInfo.topActivity
                .getPackageName();// get the top fore ground activity
        PackageManager pm = context.getPackageManager();
        PackageInfo foregroundAppPackageInfo = pm.getPackageInfo(
                foregroundTaskPackageName, 0);

        String foregroundTaskAppName = foregroundAppPackageInfo.applicationInfo
                .loadLabel(pm).toString();

        // Log.e("", foregroundTaskAppName +"----------"+
        // foregroundTaskPackageName);
        if (!foregroundTaskAppName.equals("Your App name")) {
            return true;
        }
    } catch (Exception e) {
        Log.e("isAppSentToBackground", "" + e);
    }
    return false;
}

Answer updated again
Use the below method with your package name.It will return true if any of your activity is in foreground.
public boolean isForeground(String myPackage){
ActivityManager am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
 List< ActivityManager.RunningTaskInfo > runningTaskInfo = am.getRunningTasks(1); 

     ComponentName componentInfo = runningTaskInfo.get(0).topActivity;
   if(componentInfo.getPackageName().equals(myPackage)) return true;
return false;
}

Answer Updated
Check this link first Checking if an Android application is running in the background
http://developer.android.com/guide/topics/fundamentals.html#lcycles is a description of the Life Cycle of an android application.
The method onPause() gets called when the activity goes into the background. So you can deactivate the update notifications in this method.
public static boolean isApplicationSentToBackground(final Context context) {
    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<RunningTaskInfo> tasks = am.getRunningTasks(1);
    if (!tasks.isEmpty()) {
      ComponentName topActivity = tasks.get(0).topActivity;
      if (!topActivity.getPackageName().equals(context.getPackageName())) {
        return true;
      }
    }

    return false;
  }

add permisions in the menifest as well
<uses-permission android:name="android.permission.GET_TASKS" />

A:

Unfortunately, getRunningTasks() has been deprecated since Android API 21 (Android Lollipop):

This method was deprecated in API level 21. As of LOLLIPOP, this
  method is no longer available to third party applications: the
  introduction of document-centric recents means it can leak person
  information to the caller. For backwards compatibility, it will still
  return a small subset of its data: at least the caller's own tasks,
  and possibly some other tasks such as home that are known to not be
  sensitive.

