清理缓存加载loading，如何正确显示代码实现

//清除缓存带加载框
private void clearnAllCache(Context mContext) {
        showProgressDialog(mContext, false, "清理缓存");
         try {
                String data = DataCleanManager.getTotalCacheSize(mContext);
                 new Thread(new Runnable() {
                 @Override
                 public void run() {
                              DataCleanManager.cleanApplicationData(mContext);
                              DataCleanManager.clearAllCache(mContext);
                              runOnUiThread(new Runnable() {
                                  @Override
                                  public void  run() {                                        
                                    if (!isFinishing()) {                                        
                                         Message message = handler.obtainMessage();                                       
                                         message.obj = data;                                         
                                         handler.sendMessageDelayed(message, 300);
                                    }
                                }
                            });
                    }
             }).start();
         } catch (Exception ex) {
        }
 }

 Handler handler = new Handler() {
       @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            hideProgressDialog();            
            ToastUtils.showShort(MineSettingActivity.this,  msg.obj.toString());
        }
    };
}

调用clearnAllCache（context）方法即可