How to Check Current Running Applications in Android

Getting current running application

You can try this code it gives the package of the currently active screen:

ActivityManager am = (ActivityManager) this
                .getSystemService(ACTIVITY_SERVICE);

// get the info from the currently running task
List<ActivityManager.RunningTaskInfo> taskInfo = am.getRunningTasks(1);

ComponentName componentInfo = taskInfo.get(0).topActivity;
if(!componentInfo.getPackageName().equals("your.package.name"))
{
    //Do your stuff
}

You might need the permission

<uses-permission android:name="android.permission.GET_TASKS" />

How to find the currently running applications programmatically in Android?

ActivityManager activity_manager = (ActivityManager) context
                .getSystemService(Activity.ACTIVITY_SERVICE);

ActivityManager has method getRunningTasks(int). ActivityManager seems to be the solution you are searching for.

final ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
final List<RunningTaskInfo> recentTasks = activityManager.getRunningTasks(Integer.MAX_VALUE);

for (int i = 0; i < recentTasks.size(); i++) 
{
    Log.d("Executed app", "Application executed : " +recentTasks.get(i).baseActivity.toShortString()+ "\t\t ID: "+recentTasks.get(i).id+"");         
}

Also, have a look at following thread:
See Android recent task executed by the user

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