如何從另一個在棉花糖的Android應用程序清除其他應用程序緩存？

Question

我想開發一個可以擦除其他應用程序緩存數據的Android應用程序。我試圖瀏覽所有的博客，但沒有一個爲我工作。我可以通過下面的代碼

參考清除我的應用程序的緩存：
How to delete other applications cache from our android app?

private static final long CACHE_APP = Long.MAX_VALUE; 
private CachePackageDataObserver mClearCacheObserver; 

btnCache.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      clearCache(); 
     } 
    });//End of btnCache Anonymous class 

void clearCache() 
{ 
    if (mClearCacheObserver == null) 
    { 
     mClearCacheObserver=new CachePackageDataObserver(); 
    } 

    PackageManager mPM=getPackageManager(); 

    @SuppressWarnings("rawtypes") 
    final Class[] classes= { Long.TYPE, IPackageDataObserver.class }; 

    Long localLong=Long.valueOf(CACHE_APP); 

    try 
    { 
     Method localMethod= 
      mPM.getClass().getMethod("freeStorageAndNotify", classes); 

     /* 
     * Start of inner try-catch block 
     */ 
     try 
     { 
     localMethod.invoke(mPM, localLong, mClearCacheObserver); 
     } 
     catch (IllegalArgumentException e) 
     { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
     } 
     catch (IllegalAccessException e) 
     { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
     } 
     catch (InvocationTargetException e) 
     { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
     } 
     /* 
     * End of inner try-catch block 
     */ 
    } 
    catch (NoSuchMethodException e1) 
    { 
     // TODO Auto-generated catch block 
     e1.printStackTrace(); 
    } 
}//End of clearCache() method 

private class CachePackageDataObserver extends IPackageDataObserver.Stub 
{ 
    public void onRemoveCompleted(String packageName, boolean succeeded) 
    { 

    }//End of onRemoveCompleted() method 
}//End of CachePackageDataObserver instance inner class 

而且也在你的src文件夾中創建一個包名爲android.content.pm該包內創建一個名爲IPackageDataObserver .aidl的文件並粘貼以下代碼

package android.content.pm; 

/** 
* API for package data change related callbacks from the Package Manager. 
* Some usage scenarios include deletion of cache directory, generate 
* statistics related to code, data, cache usage(TODO) 
* {@hide} 
*/ 
oneway interface IPackageDataObserver { 
    void onRemoveCompleted(in String packageName, boolean succeeded); 
} 

和您的清單一定要使用下面的代碼

<uses-permission android:name="android.permission.CLEAR_APP_CACHE"/> 

以上成功清理棒棒糖但是當這種代碼在執行Marshamallow，那麼它是不是清除所有數據代碼。爲什麼這樣做??????????????

任何建議將被接受。或另一種解決方法。謝謝。

Answer 1

因爲這是一種非官方的方式，Google現在已將方法的簽名級別提升爲signature @ system @ Marshamallow。