请指出以下代码的错误,即它没有创建正确的列表活动,包括动态图像及其来自服务器的描述
输出。这是图像
应该是这样的
因为可以看到只有一个图像没有描述而加载,其余的图像没有图像,即使没有空格,请指出xml和代码的错误。 这是代码
主要班级
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jsonfunction类,我认为需要发布,但只是为了理解其他人遵循
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;
}
}
我有两个xml文件,然后是这个项目的主要文件 的test.xml
<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>
listplace holder
<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进行设置。谢谢
答案 0 :(得分:4)
答案 1 :(得分:0)
几天前我遇到了同样的问题。 AFAIK您需要创建一个自定义ArrayAdapter。这篇文章对我有所帮助:
http://www.softwarepassion.com/android-series-custom-listview-items-and-adapters/
..这篇文章似乎也是一个很好的方法: