Question

我从网络服务器上获取了一个PHP脚本作为JSON数组。我想在Android Hive enter link description here

中的本教程中查看列表视图中的数据

首先，应用程序没有响应，但现在它正在工作但未在列表视图中填充。

这是我的代码：

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;

public class Event extends ListActivity {

    private ProgressDialog pDialog;


    JSONParser jParser = new JSONParser();

    ArrayList<HashMap<String, String>> eventList;


    private static String url_all_events = "http://examplesite.lk/sports/data.php";

    // JSON Node names
    private static final String TAG_ID = "id";
    private static final String TAG_EVENTS = "events";
    private static final String TAG_SID = "sportsid";
    private static final String TAG_VS = "vs";
    private static final String TAG_DATE = "date";
    private static final String TAG_VENUE = "venue";

    // products JSONArray
    JSONArray events = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.all_events);


        eventList = new ArrayList<HashMap<String, String>>();


        new LoadAllEvents().execute();


    }

    class LoadAllEvents extends AsyncTask<String, String, String> {


        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(Event.this);
            pDialog.setMessage("Loading events. Please wait...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
            pDialog.show();
        }

        protected String doInBackground(String... args) {

            List<NameValuePair> params = new ArrayList<NameValuePair>();

            JSONObject json = jParser.makeHttpRequest(url_all_events, "GET", params);


            Log.d("All Products: ", json.toString());

            try {

                events = json.getJSONArray(TAG_EVENTS);

                for (int i = 0; i < events.length(); i++) {
                    JSONObject c = events.getJSONObject(i);

                    String id = c.getString(TAG_ID);
                    String sid = c.getString(TAG_SID);
                    String vs = c.getString(TAG_VS);
                    String date = c.getString(TAG_DATE);
                    String venue = c.getString(TAG_VENUE);

                    HashMap<String, String> map = new HashMap<String, String>();

                    map.put(TAG_ID, id);
                    map.put(TAG_SID, sid);
                    map.put(TAG_VS, vs);
                    map.put(TAG_DATE, date);
                    map.put(TAG_VENUE, venue);



                    eventList.add(map);
                }

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

            return null;
        }


        protected void onPostExecute(String file_url) {

            pDialog.dismiss();


            runOnUiThread(new Runnable() {
                public void run() {

                    ListAdapter adapter = new SimpleAdapter(
                            Event.this, eventList,
                            R.layout.list_item, new String[] { TAG_VS,
                                    TAG_DATE},
                                    new int[] { R.id.opponent, R.id.time });

                    setListAdapter(adapter);
                }
            });

        }

    }

}

主要列表视图是：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="@drawable/bg" >

    <ListView
        android:id="@android:id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

，列表项布局为：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:background="@drawable/borders"
    android:layout_margin="5dp"
    >

    <TextView
        android:id="@+id/opponent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@color/text_color"
        android:textSize="14sp"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="5dp"
        android:layout_toRightOf="@+id/vs" />

    <TextView
        android:id="@+id/time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/school"
        android:layout_centerHorizontal="true"
        android:textColor="@color/text_color"
        android:textSize="42sp"
        android:layout_marginTop="15dp" 
        android:layout_marginBottom="15dp" />


</RelativeLayout>

Json数组是

{"events":[{"id":"2","sportid":"1","vs":"CollegeA","date":"2014-05-02 17:30:00","venue":"Grounds"},{"id":"1","sportid":"1","vs":"CollegeB","date":"2014-04-17 17:30:00","venue":"Grounds"}]}

谁能告诉我哪里出错了。以及为什么数据不在列表视图中生成

Answer 1

我知道错误。我的服务器中存在一些错误和一些语法错误。无论如何谢谢你们。只需将此代码添加到工作

ListView lv = getListView();

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