Hàm mở task top khi sử dụng PiP

/**
 * Bring up launcher task to front
 */
public static void navToLauncherTask(Context appContext) {
    if (appContext != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        ActivityManager activityManager = (ActivityManager) 
                appContext.getSystemService(Context.ACTIVITY_SERVICE);
        // iterate app tasks available and navigate to launcher task (browse task)
        if (activityManager != null) {
            final List<ActivityManager.AppTask> appTasks;
            appTasks = activityManager.getAppTasks();
            for (ActivityManager.AppTask task : appTasks) {
                final Intent baseIntent = task.getTaskInfo().baseIntent;
                final Set<String> categories = baseIntent.getCategories();
                if (categories != null && categories.contains(Intent.CATEGORY_LAUNCHER)) {
                    task.moveToFront();
                    return;
                }
            }
        }
    }
}

/**
 * Bring up launcher task to front
 */
fun FragmentActivity?.navToLauncherTask() {
    if (this == null || this.isFinishing) return
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        val activityManager = (getSystemService(AppCompatActivity.ACTIVITY_SERVICE) as ActivityManager)
        val appTasks = activityManager.appTasks
        for (task in appTasks) {
            val baseIntent = task.taskInfo.baseIntent
            val categories = baseIntent.categories
            if (categories != null && (categories.contains(Intent.CATEGORY_LAUNCHER)
                        || categories.contains(Intent.CATEGORY_DEFAULT))) {
                task.moveToFront()
                return
            }
        }
    }
}