Question

当我尝试通过HttpPost刷新或更新listview适配器时，我遇到了问题。

我想创建一个无休止的线程来调用HttpPost连接，以便获取数据并存储在适配器中。最后，我想将适配器重新设置为listview。我可以按钮工作。但我希望使用保持循环到mysql数据的线程。

请帮帮我。我找不到任何解决办法。

        public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    lv1=(ListView)findViewById(R.id.ListView01);
    lv2=(ListView)findViewById(R.id.ListView02);

    tvalert=(TextView)findViewById(R.id.textviewalert);

    getServerDatas("http://172.50.2.66/ChefGetOrdered.php");

  tv = new TextView(this);
   tv.setText("Incoming Order");

    tv1 = new TextView(this);
    tv1.setText(" Waiting list");

    lv1.addHeaderView(tv);
    lv2.addHeaderView(tv1);
    lv2.setAdapter(adapter);
    lv2.setClickable(true); 
    lv2.setTextFilterEnabled(true);

    lv1.setAdapter(adapter);
    lv1.setClickable(true);
    lv1.setDivider(null);
    lv1.setDividerHeight(0);
    lv1.setTextFilterEnabled(true);

    lv1.setOnItemClickListener(new AdapterView.OnItemClickListener() {


      public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {

        Object o = lv1.getItemAtPosition(position);
        int a = (int) lv1.getItemIdAtPosition(position);
        int ab = a+1;

        Toast.makeText(Chef.this, o.toString() , Toast.LENGTH_LONG).show();
        Toast.makeText(Chef.this, ab+"", Toast.LENGTH_LONG).show();


      }
    });
    Button button2 = (Button) findViewById(R.id.ButtonCheck);
    button2.setOnClickListener(this);



     }






        private String getServerDatas(String returnString) {

        InputStream is = null;
   String result = "";
  List<Order> listOfPhonebook = new ArrayList<Order>();



    try{

            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost(returnString);

           HttpResponse response = httpclient.execute(httppost);
            HttpEntity entity = response.getEntity();
            is = entity.getContent();

    }catch(Exception e){
         Toast.makeText(Chef.this, e.toString()+"Number 1 " , Toast.LENGTH_LONG).show();
    }

    //convert response to string
    try{

            BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                    sb.append(line + "\n");
            }
            is.close();
            result=sb.toString();
    }catch(Exception e){
            Log.e("log_tag", "Error converting result "+e.toString());
    }

         try{

             JSONArray jArray = new JSONArray(result);


           totalorder = jArray.length();

           array_list=new String[totalorder];
            table_list= new String[totalorder];




             for(int i=0;i<jArray.length();i++){
                JSONObject json_data = jArray.getJSONObject(i);





            table_list[i]=json_data.getString("table_id");


            listOfPhonebook.add(new Order("Table :"+json_data.getString("table_id")+"\n Time:",json_data.getString("order_foodname"),json_data.getString("order_quantity")));

             }

        adapter = new OrderAdapter(this, listOfPhonebook);





    }catch(JSONException e){
            Log.e("log_tag", "Error parsing data "+e.toString());
    }


    return returnString; 
}

Answer 1

循环和获取数据的抽象，从其他线程更新UI所必需的是Handler。阅读更多here。

使用httppost检查传入数据的Android无限循环

1 个答案: