(原)android4.2以後擷取應用程式和緩衝大小的方法（源碼有改變），android4.2源碼

(原)android4.2以後擷取應用程式和緩衝大小的方法（源碼有改變），android4.2源碼

以前擷取應用的大小是用

 PackageManager mPackageManager= getPackageManager();

try {Method getPackageSizeInfoMethod = PackageManager.class.getDeclaredMethod("getPackageSizeInfo", String.class,                  IPackageStatsObserver.class);  getPackageSizeInfoMethod.invoke(mPackageManager, packageInfo.packageName,new MyObserver());  } catch (Exception e) {  } 

 

class MyObserver extends IPackageStatsObserver.Stub {        @Override      public void onGetStatsCompleted(PackageStats pStats, boolean succeeded)              throws RemoteException {          long cacheSize = pStats.cacheSize;          String packageName = pStats.packageName;          String formatFileSize = Formatter.formatFileSize(                  getApplicationContext(), cacheSize);          System.out.println(packageName + ":" + formatFileSize);      }  }  

 

但在4.2後 PackageManager.getPackageSizeInfo(String packageName, IPackageStatsObserver observer)不可用，

改為PackageManager.getPackageSizeInfo(String packageName, int userHandle, IPackageStatsObserver observer),

至於增加的參數userHandle的解釋是：The user whose size information should be retrieved。

這個userHandle怎麼來？ 通過系統類別的UserHandle.myUserId()擷取；

Method myUserId = UserHandle.class.getDeclaredMethod("myUserId");  int userID = (Integer) myUserId.invoke(mPackageManager,null);  

 擷取了以後就可以使用新的getPackageSizeInfo函數了。

getPackageSizeInfoMethod.invoke(mPackageManager,packageInfo.packageName, userID, new MyObserver() );