Question

我正在尝试通过从服务器获得的事务列表来填充回收站视图。但除非我放Thread.sleep(7000)，否则它不会填充。是否需要这么多时间从服务器端获取数据？如果是的话，还有更快的选择吗？

或从json响应获取字符串并将对象添加到列表是耗时的？因为这个睡眠只是为了在列表中添加5行。当我尝试为整行数运行循环时，我没有得到任何数据。

我的主人是PythonAnywhere。 Api响应在json中，有大约400条记录：

http://sairav.pythonanywhere.com/getTransaction

使用：

Android异步Http客户端::: 编译＆＃39; com.loopj.android：android-async-http：1.4.9＆＃39;

public List<Transaction> getTransactions(final boolean getAll) {
        Thread bgThread =null;

       final List<Transaction> trList=new ArrayList<>();
        RequestParams requestParams = new RequestParams();

        requestParams.put("uid", Profile.getCurrentProfile().getId());

        PAAPI.post("/getTransaction", requestParams, new JsonHttpResponseHandler() {

 @Override
            public void onSuccess(int statusCode, Header[] headers, JSONArray jsonArray) {

                Transaction trr = null;
                if (getAll) {


                    for (int i = 0; i < 5; i++) {

                        try {
                            //String a = jsonArray.getString(i);
                            JSONObject jsonObject = jsonArray.getJSONObject(i);
                            //JSONArray arrayWithElements = jsonObject.toJSONArray(new JSONArray(new String[]{"name","desc","amount","ttype","uid","ttime"}));

                            trr =  new Transaction(context);

                            trr.uname = jsonObject.getString("uname");
                            trr.desc = jsonObject.getString("description");
                            trr.amount = jsonObject.getString("amount");
                            trr.type = jsonObject.getString("type");
                            trr.uid = jsonObject.getString("uid");
                            trr.date = jsonObject.getString("ttime");

                            trList.add(trr);
                           // Toast.makeText(context,"size is bro :"+trList.size(),Toast.LENGTH_SHORT).show();
                            if (i == 1) {
                   //             Toast.makeText(context, trr.uname + "-" + desc + "-" + trr.amount + "-" + trr.type + "-" + trr.uid + "-" + trr.date, Toast.LENGTH_SHORT).show();
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }

                    }

                    // Do something with the response

                } 
 });
        try {
           Toast.makeText(context,"sleeping bo",Toast.LENGTH_SHORT).show();

           Thread.sleep(7000);

        } catch (InterruptedException e) {
            e.printStackTrace();
        }

      //  Toast.makeText(context, "listsize final is" +  trList.size(), Toast.LENGTH_SHORT).show();
        return  trList;
    }



class PAAPI {
    protected static final String BASE_URL = "http://sairav.pythonanywhere.com";

    private static AsyncHttpClient client = new AsyncHttpClient();

    public static void get(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
        client.post(getAbsoluteUrl(url), params, responseHandler);
    }

    public static void post(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
        client.post(getAbsoluteUrl(url), params, responseHandler);
    }

    private static String getAbsoluteUrl(String relativeUrl) {
        return BASE_URL + relativeUrl;
    }
}

Answer 1

使用可用的改造库从json url检索或发布数据...它非常易于使用且效率很高

Answer 2

如果您确定getString()操作需要花费太多时间才能执行，那么您可以使用进度对话框而不是Thread.sleep()

private class PAAPI extends AsyncTask<Boolean, Void, List<Transaction> {

   ProgressDialog dialog = new ProgressDialog(MainActivity.this);

   @Override
   protected void onPreExecute() {
      //set message of the dialog
      dialog.setMessage("Loading...");
      //show dialog
      dialog.show();
      super.onPreExecute();
   }

   protected Void doInBackground(Boolean... args) {
      // do background work here
      return null;
   }

   protected void onPostExecute(List<Transaction> result) {
     // do UI work here
     if(dialog != null && dialog.isShowing()){
       dialog.dismiss()
     }
   }
}

稍后将其用作new PAAPI().execute(getAll);

从服务器获取数据太慢了？（机器人）

2 个答案:

从服务器获取数据太慢了？ （机器人）

2 个答案:

从服务器获取数据太慢了？（机器人）