如何从我们的Andr​​oid应用程序，删除其他应用程序缓存？ [英] How to delete other applications cache from our android app?

问题描述

我想开发一个Android应用程序，可以消除其他应用程序缓存的数据，我想浏览所有的博客，但他们没有工作对我来说，我可以能够清楚我的应用程序的缓存由以下code

I'm trying to develop an android app that could erase others application cache data, I tried to browse through all blogs but none of them worked for me, I can able to clear my application's cache by the following code

File cache = getCacheDir();
            File appDir = new File(cache.getParent());
            if (appDir.exists()) 
            {
                String[] children = appDir.list();
                for (String s : children) 
                {
                    if (!s.equals("lib"))
                    {
                        deleteDir(new File(appDir, s));
                        Toast.makeText(DroidCleaner.this, "Cache Cleaned", Toast.LENGTH_LONG).show();
                        Log.i("TAG", "**************** File /data/data/APP_PACKAGE/" + s + " DELETED *******************");
                    }
                }
            }

public static boolean deleteDir(File dir) 
{
    if (dir != null && dir.isDirectory()) 
    {
        String[] children = dir.list();
        for (int i = 0; i < children.length; i++) 
        {
            boolean success = deleteDir(new File(dir, children[i]));
            if (!success) 
            {
                return false;
            }
        }
    }
    return dir.delete();
}

我的清单code

My manifest code

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

我测试了code在2.2，2.3和4.0

I tested the code on 2.2, 2.3 and 4.0

和看到帖子在以下链接的Andr​​oid后：所有的应用程序清除缓存？

and after seeing the post in the following link Android: Clear Cache of All Apps?

我改变了我的code到

I changed my code to

PackageManager  pm = getPackageManager();
// Get all methods on the PackageManager
Method[] methods = pm.getClass().getDeclaredMethods();
for (Method m : methods) {
    if (m.getName().equals("freeStorage")) {
        // Found the method I want to use
        try {
            long desiredFreeStorage = 8 * 1024 * 1024 * 1024; // Request for 8GB of free space
        m.invoke(pm, desiredFreeStorage , null);
    } catch (Exception e) {
        // Method invocation failed. Could be a permission problem
    }
    break;
   }
}

我要清除其他应用程序的缓存，任何机构可以请帮助我，请纠正我，如果我错了，在此先感谢。

I want to clear other application's cache, can any body please help me, please correct me if I'm wrong, Thanks in advance.

推荐答案

我用下面的code，现在我可以清除所有程序的缓存，而不生根，它的工作完美的我，

I used the following code and now I'm able to clear all application's cache without rooting, it's working perfectly for me,

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

和也创造了你的的src 文件夹的名称 android.content.pm 的包内创建一个pacakge在名称的文件 IPackageDataObserver.aidl 并粘贴以下code将它

And also create a pacakge in your src folder with the name android.content.pm inside that package create a file in the name IPackageDataObserver.aidl and paste the following code to it

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);
}

在你的清单请确保您使用以下code

and in your manifest make sure you used the following code

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

如果你们发现有什么问题随时联系我，谢谢。

If you guys find any problem feel free to contact me, Thanks.

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