我正在使用 json 解析器将图像 url 和描述传递到我的列表视图中。现在我设法加载了图像，但是如何更改列表视图的文本？目前它只显示第 0 项、第 1 项等等。我如何将描述传递给lazyadapter？
主要活动：
public class MainActivity extends Activity {
// CREATING JSON PARSER OBJECT
JSONParser jParser = new JSONParser();
JSONArray guide = null;
ListView list;
LazyAdapter adapter;
String[] mImageIds;
ArrayList<String> guideList =new ArrayList<String>();
ArrayList<String> descriptionList =new ArrayList<String>();
// GUIDE URL
private static String url_guide = "http://58.185.41.178/magazine_android/get_guide.txt";
private static final String TAG_GUIDES = "guides"; //the parent node of my JSON
private static final String TAG_DESCRIPTION = "description";
private static final String TAG_IMAGE = "image";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// LOADING Guide IN BACKGROUND THREAD
new LoadGuide().execute();
list=(ListView)findViewById(R.id.list);
adapter=new LazyAdapter(this,guideList);
list.setAdapter(adapter);
Button b=(Button)findViewById(R.id.button1);
b.setOnClickListener(listener);
}
@Override
public void onDestroy()
{
list.setAdapter(null);
super.onDestroy();
}
public OnClickListener listener=new OnClickListener(){
@Override
public void onClick(View arg0) {
adapter.imageLoader.clearCache();
adapter.notifyDataSetChanged();
}
};
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadGuide extends AsyncTask<String, String, String> {
/**
* getting All videos from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_guide, "GET", params);
// CHECKING OF JSON RESPONSE
Log.d("All guide: ", json.toString());
try {
guide = json.getJSONArray(TAG_GUIDES);
for (int i = 0; i < guide.length(); i++) {
JSONObject c = guide.getJSONObject(i);
//String title = c.getString(TAG_DESCRIPTION);
String image = c.getString(TAG_IMAGE);
String description = c.getString(TAG_DESCRIPTION);
guideList.add(image);
descriptionList.add(description);
System.out.println(guideList);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// UPDATING UI FROM BACKGROUND THREAD
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
adapter.notifyDataSetChanged();
}
});
}
}
}
图像适配器：
public class LazyAdapter extends BaseAdapter {
private Activity activity;
private ArrayList<String> data;
private static LayoutInflater inflater=null;
public ImageLoader imageLoader;
public LazyAdapter(Activity a, ArrayList<String> guideList) {
activity = a;
data=guideList;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
imageLoader=new ImageLoader(activity.getApplicationContext());
}
public int getCount() {
return data.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View vi=convertView;
if(convertView==null)
vi = inflater.inflate(R.layout.item, null);
TextView text=(TextView)vi.findViewById(R.id.text);;
ImageView image=(ImageView)vi.findViewById(R.id.image);
text.setText("item "+position);
imageLoader.DisplayImage(data.get(position), image);
return vi;
}
}