获取Activity启动页面的名字

1. String getTopActivity()  
2. {  
3.      ActivityManager manager = (ActivityManager)getSystemService(ACTIVITY_SERVICE);  
4.      List<RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(1);  
5.   
6.      if(runningTaskInfos != null)  
7.        return (runningTaskInfos.get(0).topActivity).toString();  
8.      else  
9.        return null ;  
10. }