android - 设置动态列表 Activity

Question

请指导以下代码有什么问题，它没有创建正确的列表 Activity ，包括来自服务器的动态图像及其描述输出。这是图像

应该是这样的

可以看到只加载了一张图片，没有描述，其余没有图片甚至没有空间，请指导xml和代码有什么问题。这是代码

主类

public class Test extends ListActivity  {


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

        // install handler for processing gui update messages
        ArrayList<HashMap<String, Object>> mylist = new ArrayList<HashMap<String, Object>>(); 
       JSONObject json = JSONfunctions.getJSONfromURL("http://midsweden.gofreeserve.com/proj/androidjson.php?identifier=123" );


        try{

            JSONArray  earthquakes = json.getJSONArray("services");

            for(int i=0;i<earthquakes.length();i++){                        
                HashMap<String, Object> map = new HashMap<String, Object>();
                 JSONObject e = earthquakes.getJSONObject(i);

                map.put("id", e.getString("taskid"));
                map.put("pic", "Service name : " + e.getString("employeepic"));
                map.put("serviceinfo", "" +  e.getString("employeename")+ " : "+ e.getString("starttime")
                        +" To " +  e.getString("endtime"));


                 String imageid = e.getString("employeepic");


                    ImageView iv = (ImageView) findViewById(R.id.image);
                    Bitmap b = getUserPic(imageid);
                    iv.setImageBitmap(b);


                    map.put("img",b);
                mylist.add(map);            
            }       
        }catch(JSONException e)        {
             Log.e("log_tag", "Error parsing data "+e.toString());
        }

        SimpleAdapter adapter = new SimpleAdapter(this, mylist , R.layout.test,new String[] {"img", "servicename", "serviceinfo" }, 
                        new int[] {  R.id.image ,R.id.items, R.id.item_subtitle });

        setListAdapter(adapter);

        final ListView lv = getListView();
        lv.setTextFilterEnabled(true);  
        lv.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {              
                @SuppressWarnings("unchecked")
                HashMap<String, String> o = (HashMap<String, String>) lv.getItemAtPosition(position);                   
                Toast.makeText(Test.this, "ID '" + o.get("id") + "' was clicked.", Toast.LENGTH_SHORT).show(); 

            }
        });

    }

    public Bitmap getUserPic(String picID) {
        String imageURL;
        Bitmap bitmap = null;
        Log.d("BITMAP", "Loading Picture");
        imageURL = "http://midsweden.gofreeserve.com/proj/admin/"+picID;
        try {
            bitmap = BitmapFactory.decodeStream((InputStream)new URL(imageURL).getContent());
        } catch (Exception e) {
            Log.d("BITMAP", "Loading Picture FAILED");
            e.printStackTrace();
        }
        return bitmap;
    }


}

这是我认为需要发布的 jsonfunction 类，但只是为了让其他人理解

public class JSONfunctions {

    public static JSONObject getJSONfromURL(String url){
        InputStream is = null;
        String result = "";
        JSONObject jArray = null;

        //http post
        try{
                HttpClient httpclient = new DefaultHttpClient();
                HttpPost httppost = new HttpPost(url);
                HttpResponse response = httpclient.execute(httppost);
                HttpEntity entity = response.getEntity();
                is = entity.getContent();

        }catch(Exception e){
                Log.e("log_tag", "Error in http connection "+e.toString());
        }

      //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{

            jArray = new JSONObject(result);            
        }catch(JSONException e){
                Log.e("log_tag", "Error parsing data "+e.toString());
        }

        return jArray;
    }
}

除了这个项目的主文件之外，我还有两个 xml 文件，它们是测试文件

<TextView  

    android:id="@+id/items"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:padding="2dp"
    android:textSize="20dp" />
    <TextView  
    android:id="@+id/item_subtitle"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:padding="2dp"
    android:textSize="18dp" />
</LinearLayout>

列表占位符

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">    
     <ImageView
      android:id="@+id/image"
      android:layout_width="50dip"
      android:layout_height="50dip"
       android:scaleType="centerCrop"/>
    <ListView
        android:id="@id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:drawSelectorOnTop="false" />

    <TextView
        android:id="@id/android:empty"
        android:layout_width="fill_parent"
       android:layout_height="wrap_content"
        android:text="No data"/>

</LinearLayout>

我知道有 lazylist 可用，但我想根据我的理解设置它。谢谢

Answer 1

好的，我为您准备了另一个示例项目，您可以下载 here.它的代码太多无法发布，所以我压缩了项目以便您可以下载它。如果您不确定任何东西是如何工作的，那就问吧!享受吧。

顺便说一句，它看起来像这样: