如何覆盖bd文件

Question

有这样的任务：从服务器接收数据库文件（格式为.db）并覆盖新文件上的旧文件。

我试试：

@Override
public void onSuccess(int statusCode, cz.msebera.android.httpclient.Header[] headers,
                                      File file) {
    if (statusCode != 200) {
        Toast.makeText(SettingsActivity.this, getResources().getText(R.string.error),
                                Toast.LENGTH_SHORT).show();
        return;
    }
    Log.v(TAG, "response - success - " + file);

    try {
        FileInputStream input = new FileInputStream(file);
        String outputFile = String.valueOf(getApplicationContext().getDatabasePath("name_db"));
        OutputStream output = new FileOutputStream(outputFile);
        byte[] buffer = new byte[input.available()];
        int i;
        while ((i = input.read(buffer)) > 0) {
             output.write(buffer, 0, i);
        }
        output.flush();
        output.close();
        input.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    pd.cancel();
}

但它不起作用。实现这个的最佳方法是什么？

以防万一，将文件发送到服务器的代码：

 RequestParams params_ = new RequestParams();
 AsyncHttpClient client = new AsyncHttpClient(true, 80, 443);

 Context context = getApplicationContext();

 File dbFile = new File(String.valueOf(context.getDatabasePath("name_db")));

 try {
      params_.put("db", dbFile);
 } catch(FileNotFoundException e) {
      Log.v(TAG, "error - file not found");
 }

 client.post("example.com", params_, new JsonHttpResponseHandler() {
        @Override
        public void onSuccess(int statusCode, cz.msebera.android.httpclient.Header[] headers, JSONObject json) {
             Log.v(TAG, "response -- " + json);
             try {
                  if (0 == json.getInt("status")) {
                      Toast.makeText(SettingsActivity.this, getResources().getText(R.string.successfully),
                                    Toast.LENGTH_SHORT).show();
                  } else {
                      Toast.makeText(SettingsActivity.this, getResources().getText(R.string.error),
                                    Toast.LENGTH_SHORT).show();
                  }
              } catch (JSONException e) {
                  e.printStackTrace();
              }
              pd.cancel();
         }
   });