清理应用程序缓存

1、获取应用程序缓存信息

2、清理缓存（也可以不用步骤1，直接清理，步骤1只是为了知道哪些程序有缓存）

1）

Method getPackageSizeInfo = pm.getClass().getMethod("getPackageSizeInfo", String.class, IPackageStatsObserver.class);   List<ApplicationInfo> application = new ArrayList();application = pm.getInstalledApplications(0);for(int i=0;i<application.size();i++){ApplicationInfo app = application.get(i);getPackageSizeInfo.invoke(pm, app.packageName,  new IPackageStatsObserver.Stub() {   @Override  public void onGetStatsCompleted(PackageStats pStats, boolean succeeded) throws RemoteException {   if(pStats.cacheSize != 0){cacheSize += pStats.cacheSize;Log.e(TAG, "cacheSize: " + pStats.packageName + "  ;" + pStats.cacheSize); }}   });}

上面的方法 通过反射机制获取应用程序的缓存信息

2）

Method localMethod = pm.getClass().getMethod("freeStorageAndNotify", Long.TYPE,IPackageDataObserver.class);Long localLong = Long.valueOf(getEnvironmentSize() - 1L);Object[] arrayOfObject = new Object[2];    arrayOfObject[0] = localLong;    localMethod.invoke(pm,localLong,new IPackageDataObserver.Stub()      {@Overridepublic void onRemoveCompleted(String packageName,boolean succeeded) throws RemoteException {}});

同样通过反射，来清除缓存

private long getEnvironmentSize()    {      File dataFile = Environment.getDataDirectory();      if (dataFile == null)        return 0;      else      {        StatFs localStatFs = new StatFs(dataFile.getPath());        long l2 = localStatFs.getBlockSize();        return localStatFs.getBlockCount() * l2;      }    }

需要用到3个AIDL：
IPackageDataObserver.aidl 

IPackageStatsObserver.aidl

PackageStats.aidl