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()
              {
                @Override
                public 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

 

转自： http://blog.csdn.net/ff313976