带有简单适配器的 Android ListView [英] Android ListView with Simple Adapter

问题描述

我创建了 ListView 活动来列出从服务器检索到的一些数据.

I created ListView activity to list some data retrieved from server.

这是ListAtmActivity.

public class ListAtmActivity extends ListActivity{

private static String url ="http://10.0.2.2:8080/hello/AvailabilityResponse";

private static final String ATM_NO = "atmbrno";
private static final String ATM_PLACE = "atmbrname";

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


    String brName=getIntent().getExtras().getString("key");


    // Hashmap for ListView
    ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();

    // Creating JSON Parser instance
    JSONParser jParser = new JSONParser();

    // getting JSON string from URL
    JSONArray contacts = jParser.getJSONFromUrl(url,brName);

    try{

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

            // Storing each json item in variable
            String atm_id = json_data.getString(ATM_NO);
            String atm_name = json_data.getString(ATM_PLACE);

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

            map.put(ATM_NO, atm_id);
            map.put(ATM_PLACE, atm_name);

            contactList.add(map);                
        }                       
    }

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

    }
    /**
     * Updating parsed JSON data into ListView
     * */
   ListAdapter adapter = new SimpleAdapter(this, contactList,
            R.layout.list_main,
            new String[] { ATM_NO, ATM_PLACE }, new int[] {
                    R.id.name , R.id.email });

    setListAdapter(adapter); 

    //setContentView(R.layout.list_main);

}}

我的联系人数组是这样的.

My contact array is like this.

{"atmbrname":"ANURADAPURA [ATM 2]","atmbrno":"ATM084"},
{"atmbrname":"MANNAR BRANCH ","atmbrno":"ATM344"}

这里还有我的两个 xml 文件.

Here my two xml file also.

list_item.xml

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

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

list_main.xml

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

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">
    <!-- Name Label -->
    <TextView
        android:id="@+id/name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textColor="#43bd00"
        android:textSize="16sp"
        android:textStyle="bold"
        android:paddingTop="6dip"
        android:paddingBottom="2dip" />
    <!-- Description label -->
    <TextView
        android:id="@+id/email"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textColor="#acacac"
        android:paddingBottom="2dip">
    </TextView>

</LinearLayout>

但我无法获得列表视图.没有错误来.我认为我的 xml 文件有问题.谁能帮我解决这个问题..

But I can't get list view. No errors came. I think problem with my xml files. can anyone help me to solve this problem..

推荐答案

我会尝试将高度设置为match_parent".但不确定这是否能解决您的问题.

I would try to set the height to "match_parent". But not sure if that fixes your problem.

我只有 ListActivity 有问题，因此我总是使用普通的 Activity 并从 Activity 的 Contentview 中检索 ListView.

I only had problems with ListActivity, therefore I am using always a normal Activity and retrieve the ListView from the Contentview of the activity.

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