Get current running app name (Only supported on API 20 or lower)

AndroidManifest.xml

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

Utility.java

public static String getCurrentAppName(Context context) {
    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    ActivityManager.RunningTaskInfo foregroundTaskInfo = am.getRunningTasks(1).get(0);
    String foregroundTaskPackageName = foregroundTaskInfo.topActivity.getPackageName();
    PackageManager pm = context.getPackageManager();
    try {
        PackageInfo foregroundAppPackageInfo = pm.getPackageInfo(foregroundTaskPackageName, 0);
        return foregroundAppPackageInfo.applicationInfo.loadLabel(pm).toString();
    } catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
    }
    return null;
}