判断自己的activity是否是在top

有时候我们需要判断自己的应用是否在前台显示
protected static boolean isTopActivity(Activity activity){
        String packageName = "xxxxx";
        ActivityManager activityManager = (ActivityManager) activity.getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningTaskInfo>  tasksInfo = activityManager.getRunningTasks(1);  
        if(tasksInfo.size() > 0){  
            System.out.println("---------------包名-----------"+tasksInfo.get(0).topActivity.getPackageName());
            //应用程序位于堆栈的顶层  
            if(packageName.equals(tasksInfo.get(0).topActivity.getPackageName())){  
                return true;  
            }  
        }  
        return false;
    }
需要添加android.permission.GET_TASKS权限