//get usagestats service

IUsageStats mUsageStatsService = IUsageStats.Stub

.asInterface(ServiceManager.getService(“usagestats”));

try {

//get PkgUsageStats

PkgUsageStats aStats = mUsageStatsService

.getPkgUsageStats(aName);

PkgUsageStats bStats = mUsageStatsService

.getPkgUsageStats(bName);

if(aStats!=null && bStats!=null) {

if ((aStats.launchCount > bStats.launchCount)

|| ((aStats.launchCount == bStats.launchCount) && (aStats.usageTime > bStats.usageTime)))

result = -1;

else if ((aStats.launchCount < bStats.launchCount)

|| ((aStats.launchCount == bStats.launchCount) && (aStats.usageTime < bStats.usageTime)))

result = 1;

else {

result = 0;

}

}else if(aStats!=null && bStats ==null) {

result = -1;

} else if(aStats==null && bStats !=null) {

result = 1;

}

} catch (RemoteException e) {

Log.i(“TAG”, “get package usage stats fail”);

}

return result;

}

那么如果想在sdk中使用这个 类要如果作呢–可以使用反射 的方法，代码如下：

public final int compare(ApplicationInfo a, Ap

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plicationInfo b) {

ComponentName aName = a.intent.getComponent();

ComponentName bName = b.intent.getComponent();

int aLaunchCount,bLaunchCount;

long aUseTime,bUseTime;

int result = 0;

try {

//获得ServiceManager类

Class<?> ServiceManager = Class

.forName(“android.os.ServiceManager”);

//获得ServiceManager的getService方法

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方法

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

//调用asInterface方法获取IUsageStats对象

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

//获得getPkgUsageStats(ComponentName)方法

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

//调用getPkgUsageStats 获取PkgUsageStats对象

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);