如何清除緩存的Android

Question

我需要找到一種方法如何清除cache.Basically我的應用程序商店，我使用費多爾的（Lazy load of images in ListView）懶列表實現了數據，我想自動清除緩存時，我有例如100個圖像loaded.Any想法如何做到這一點？

編輯： 代碼：

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    list=(ListView)findViewById(R.id.list); 
    adapter=new LazyAdapter(this, mStrings); 
    list.setAdapter(adapter); 

    deleteCache(this); 
    adapter.notifyDataSetChanged(); 


} 

public static void deleteCache(Context context) { 
    try { 
     File dir = context.getCacheDir(); 
     if (dir != null && dir.isDirectory()) { 
      deleteDir(dir); 
     } 
    } catch (Exception e) {} 
} 

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(); 
} 

Answer 1

這將刪除緩存

public static void deleteCache(Context context) { 
    try { 
     File dir = context.getCacheDir(); 
     if (dir != null && dir.isDirectory()) { 
      deleteDir(dir); 
     } 
    } catch (Exception e) {} 
} 

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(); 
} 

Answer 2

我希望這可以幫助您獲得進一步

public static void trimCache(Context context) { 
    File dir = context.getCacheDir(); 
    if(dir!= null && dir.isDirectory()){ 
     File[] children = dir.listFiles(); 
     if (children == null) { 
      // Either dir does not exist or is not a directory 
     } else { 
      File temp; 
      for (int i = 0; i < children.length; i++) { 
       temp = children[i]; 
       temp.delete(); 
      } 
     } 

    } 

} 

Answer 3

丟棄舊的適配器和附加listview到適配器的新實例（l雖然istview會失去滾動位置）。例如：

@Override 
public void onConfigurationChanged(Configuration newConfig) { 
    super.onConfigurationChanged(newConfig); 
    m_adapter = new MyAdapter(this); 
     final ListView listView = (ListView) getView() 
       .findViewById(R.id.my_list); 
     listView.setAdapter(m_adapter); 
    } 
} 

Answer 4

如果使用Apache下議院IO，你可以用一個線做到這一點（不包括的try-catch）：

try { 
    FileUtils.deleteDirectory(context.getCacheDir()); 
} catch (IOException e) { 
    // Do some error handling 
} 

Answer 5

可以調用系統服務clearApplicationUserData（）（只工作爲> =奇巧版）

這樣你就可以進行版本做了檢查，然後一切都會罰款:) 這裏是代碼：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { 
      ((ActivityManager) getActivity().getSystemService(Context.ACTIVITY_SERVICE)) 
        .clearApplicationUserData(); 
    }