Android(安卓)如何获取最顶端的Top Activity

Android 如何获取最顶端的Top Activity, 见如下代码：

    public static class TopActivityInfo {        public String packageName = "";        public String topActivityName = "";    }

    private TopActivityInfo getTopActivityInfo() {        ActivityManager manager = ((ActivityManager)GlobalConfig.getContext().getSystemService(Context.ACTIVITY_SERVICE));        TopActivityInfo info = new TopActivityInfo();        if (Build.VERSION.SDK_INT >= 21) {            List pis = manager.getRunningAppProcesses();            ActivityManager.RunningAppProcessInfo topAppProcess = pis.get(0);            if (topAppProcess != null && topAppProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {                info.packageName = topAppProcess.processName;                info.topActivityName = "";            }        } else {            //getRunningTasks() is deprecated since API Level 21 (Android 5.0)            List localList = manager.getRunningTasks(1);            ActivityManager.RunningTaskInfo localRunningTaskInfo = (ActivityManager.RunningTaskInfo)localList.get(0);            info.packageName = localRunningTaskInfo.topActivity.getPackageName();            info.topActivityName = localRunningTaskInfo.topActivity.getClassName();        }        return info;    }

我在另外一篇文章里面介绍了另外几种获取最顶端Top Activity的方法，详见： http://blog.csdn.net/wangbaochu/article/details/50554406

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