android调用系统中的应用点击次数统计 无法运行求大神帮助！

 public int compare(ApplicationInfo a,ApplicationInfo b) {

    	//这个地方被我修改过 

        //原来的是ComponentName aName = a.intent.getComponent（）;这个不能通过

        ComponentName aName = new ComponentName("com.example.testapp", "com.example.testapp.MainActivity"); //null;//a.c

        ComponentName bName =null;// b..getComponent();

        int aLaunchCount=0 ,bLaunchCount=0;

        long aUseTime=0,bUseTime=0;

        int result = 0;

        try {

             //获得ServiceManager类

             Class<?> ServiceManager = Class.forName("android.os.ServiceManager");

             

             //获得ServiceManager的getService办法

             Method getService = ServiceManager.getMethod("getService",java.lang.String.class);

             

             //调用getService获取RemoteService

             Object oRemoteService = getService.invoke(null, "usagestats");

             

             //获得IUsageStats.Stub类

             Class<?> cStub = Class.forName("com.android.internal.app.IUsageStats$Stub");

             //获得asInterface办法

             Method asInterface = cStub.getMethod("asInterface",android.os.IBinder.class);

             //调用asInterface办法获取IUsageStats对象

             Object oIUsageStats = asInterface.invoke(null, oRemoteService);

             //获得getPkgUsageStats（ComponentName）办法

             Method getPkgUsageStats = oIUsageStats.getClass().getMethod("getPkgUsageStats", ComponentName.class);

             //调用getPkgUsageStats 获取PkgUsageStats对象

             //到这里就报错了

             Object aStats = getPkgUsageStats.invoke(oIUsageStats, aName);

             Object bStats = getPkgUsageStats.invoke(oIUsageStats, bName);

             

             //获得PkgUsageStats类

             Class<?> PkgUsageStats = Class.forName("com.android.internal.os.PkgUsageStats");

             

             aLaunchCount = PkgUsageStats.getDeclaredField("launchCount").getInt(aStats);

             bLaunchCount = PkgUsageStats.getDeclaredField("launchCount").getInt(bStats);

             aUseTime = PkgUsageStats.getDeclaredField("usageTime").getLong(aStats);

             bUseTime = PkgUsageStats.getDeclaredField("usageTime").getLong(bStats);

             

             if((aLaunchCount>bLaunchCount)||

                     ((aLaunchCount == bLaunchCount)&&(aUseTime>bUseTime)))

                 result = 1;

             else if((aLaunchCount<bLaunchCount)||((aLaunchCount==

                 bLaunchCount)&&(aUseTime<bUseTime)))

                 result = -1;

             else {

                 result = 0;

             }



             } catch (Exception e) {

            	 e.printStackTrace();

             // Log.e("＃＃＃", e.toString(), e);

         }



        return result;

    }

补充：移动开发 ,  Android

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