How to get application name on various Android device?

Question

I am using bellow code to get application name in Android. For example on Galaxy S4; if the phone is in Home screen, and the below function returns the TouchWiz home. However, on Note 4, the function returns Google Home. Do we have any way to maintain the application name or detect the name depending on the device name? Currently, I save the Home screen in a list corresponding to the device name. However, I think it will not cover all possible case.

public String getAppName() {
        String foregroundProcess = "";
        ActivityManager activityManager = (ActivityManager) getApplicationContext().getSystemService(ACTIVITY_SERVICE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {                                
            UsageStatsManager mUsageStatsManager = (UsageStatsManager) getSystemService(USAGE_STATS_SERVICE);
            long time = System.currentTimeMillis();
            List<UsageStats> stats = mUsageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_DAILY, time - 1000 * 1000, time); 
            // Sort the stats by the last time used
            if (stats != null) {
                SortedMap<Long, UsageStats> mySortedMap = new TreeMap<Long, UsageStats>();
                for (UsageStats usageStats : stats) {
                    mySortedMap.put(usageStats.getLastTimeUsed(), usageStats);
                }
                if (mySortedMap != null && !mySortedMap.isEmpty()) {
                    String topPackageName = mySortedMap.get(mySortedMap.lastKey()).getPackageName();
                    foregroundProcess = topPackageName;
                }
            }
        } else {                                                                                    
            @SuppressWarnings("deprecation")
            ActivityManager.RunningTaskInfo foregroundTaskInfo = activityManager.getRunningTasks(1).get(0);
            foregroundProcess = foregroundTaskInfo.topActivity.getPackageName();
        }

        //Convert package name to application name
        final PackageManager pm = getApplicationContext().getPackageManager();
        ApplicationInfo ai;
        try {
            ai = pm.getApplicationInfo(foregroundProcess, 0);
        } catch (final PackageManager.NameNotFoundException e) {
            ai = null;
        }
        String applicationName = (String) (ai != null ? pm.getApplicationLabel(ai) : "(unknown)");       

        return applicationName;
    }