Question

数据加载两次...意味着AsyncTask onPostExecute加载相同的数据两次？我的 AsyncTask onPostExecute 运行两次加载相同的数据...... 我正在运行异步任务来从服务器加载结果。在gridview中显示数据，但数据显示两次...我很困惑为什么AsyncTask输出数据两次。 请帮帮我 这是我的代码：

 <form method='post' class="form-inline">
      <div class="form-group">
         <div id="result_table">
              <!--  dynamic load -->
          </div>
        </div>
  </form>

这是parseJsonResponse

public class InfoAccountsascyn extends AsyncTask <String, String, String>{

    String result;
    String s;
    private Activity activity;
    private String url;
    private String user_id;
    private ProgressDialog pDialog;
    JSONObject json;
    JSONParser jsonParser = new JSONParser();
    private static final String TAG_SUCCESS = "Success";
    int Success;

    public InfoAccountsascyn(Activity activity, String url,String user_id) {
        super();
        this.activity = activity;
        this.url = url;
        this.user_id=user_id;
    }
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(activity);
        pDialog.setMessage("Loading Items...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.setCanceledOnTouchOutside(false);
        pDialog.show();
    }

    protected String doInBackground(String... args) {
        try {

            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("customer_id", user_id));
            //if(Last_id!=null){
            // params.add(new BasicNameValuePair("last_product_id", Last_id));
            // }

            json = jsonParser.makeHttpRequest(url, "POST", params);

            Success = json.getInt(TAG_SUCCESS);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        if (Success == 1) {
            result = json.toString();
        }else{
            try {
                result = json.getString("CartData");
                //s=result;
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        return result;
    }

    protected void onPostExecute(String result) {
        ((DetaildAddress) activity).parseJsonResponse(result);
        pDialog.dismiss();

   }
   }

这是OnCreate，我称之为AsyncTask

public void parseJsonResponse(String result) {

String res = result;
    if (res !=null) {
        try {
            JSONObject jObjects = new JSONObject(result);
            JAS = jObjects.getJSONArray("Data");
            for (int i = 0; i < JAS.length(); i++) {
                JSONObject c = JAS.getJSONObject(i);
                DetailedAddressInfo productinfo = new DetailedAddressInfo();
                productinfo.setFirstname(c.optString("firstname"));
                productinfo.setLastname(c.optString("lastname"));
                productinfo.setStreet(c.optString("street"));
                productinfo.setCity(c.optString("city"));
                productinfo.setRegion(c.optString("region"));
                productinfo.setPostcode(c.optString("postcode"));
                productinfo.setTelephone(c.optString("telephone"));
                productinfo.setFax(c.optString("fax"));
                productinfo.setAddId(c.optString("customer_address_id"));
                productinfo.setBilling(c.optString("is_default_billing"));
                productinfo.setShipping(c.optString("is_default_shipping"));


                products.add(productinfo);
                if (i == JAS.length() - 1) {
                    Last_id = c.optString("product_id");
                }
            }
            adapter = new DetailedAddressAdapter(DetaildAddress.this, R.layout.deshbord_address, products);
            gridView.setAdapter(adapter);
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
    else {
        new AlertDialog.Builder(DetaildAddress.this)
        .setTitle("No Address Available")
                .setMessage("You Want to Add New Address")
                .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Intent intent=new Intent(DetaildAddress.this,NewAddress.class);
                        String ok = "0";
                        intent.putExtra("ok", ok);
                        startActivity(intent);
                    }
                })
                .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        // do nothing
                    }
                })
                .setIcon(android.R.drawable.ic_dialog_alert)
                .show();
    } if (pDialog != null) {
        pDialog.dismiss();
    }
}

Answer 1

你应该在初始化JSONObject之前使用Arraylist的clear（）方法，如下所示：

if(products.size()>0)
 products.clear();

Answer 2

我遇到了同样的问题。我在我的代码中发现了一个小问题我没有忽略我在AsyncTask的onPostExecute（）中打开的对话框，以便在AsyncTask工作之后做一些额外的工作。

当我打电话给myCustomDialog.dismiss()时，一切正常。

数据加载两次...意味着AsyncTask onPostExecute加载相同的数据两次？

2 个答案: