ActivityManager(一)--获取栈顶Activity及其所属进程

//获取栈顶Activity及其所属进程
	public static String getTopActivityNameAndProcessName(Context context){
		String processName=null;
		String topActivityName=null;
		 ActivityManager activityManager =
		(ActivityManager)(context.getSystemService(android.content.Context.ACTIVITY_SERVICE )) ;
	     List<RunningTaskInfo> runningTaskInfos = activityManager.getRunningTasks(1) ;
	     if(runningTaskInfos != null){
	    	 ComponentName f=runningTaskInfos.get(0).topActivity;
	    	 String topActivityClassName=f.getClassName();
	    	 String temp[]=topActivityClassName.split("\\.");
	    	 //栈顶Activity的名称
	    	 topActivityName=temp[temp.length-1];
	    	 int index=topActivityClassName.lastIndexOf(".");
	    	//栈顶Activity所属进程的名称
	    	 processName=topActivityClassName.substring(0, index);
	    	 System.out.println("---->topActivityName="+topActivityName+",processName="+processName);

	     }
	     return topActivityName+","+processName;
	}

注意权限:
<uses-permission android:name="android.permission.GET_TASKS"/>