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Show data in listview with Asynctask

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滥情空心 2021-01-23 07:42

I success show my data from web service JSON in listview, but I want to add Asyntask. Where I can put code Asyntask in my code.

This my code to show data in list

2条回答
  • 走了就别回头了
    走了就别回头了 (楼主)
    2021-01-23 08:37

    This is my code please try this one,

    MAinActivity.java

    public class MyActivity extends Activity {

private ListView contests_listView;
private ProgressBar pgb;
ActivitiesBean bean;
ArrayList listActivities;
ActivityAdapter adapter;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_listview);

    contests_listView = (ListView) findViewById(R.id.activity_listView);
    pgb = (ProgressBar) findViewById(R.id.contests_progressBar);
    listActivities = new ArrayList();

    new FetchActivitesTask().execute();


}

public class FetchActivitesTask extends AsyncTask {

    int i =0;
    @Override
    protected void onPreExecute() {
        // TODO Auto-generated method stub
        super.onPreExecute();
         pgb.setVisibility(View.VISIBLE);
    }

    @Override
    protected Void doInBackground(Void... params) {
        // TODO Auto-generated method stub

        String url = "Your URL Here";
        String strResponse = util.makeWebCall(url);

        try {
            JSONObject objResponse = new JSONObject(strResponse);

            JSONArray jsonnodes = objResponse.getJSONArray(nodes);

            for (i = 0; i < jsonnodes.length(); i++) 
            {
                String str = Integer.toString(i); 
                Log.i("Value of i",str);

                JSONObject jsonnode = jsonnodes.getJSONObject(i); 

                JSONObject jsonnodevalue = jsonnode.getJSONObject(node);

                bean = new ActivitiesBean();

                bean.title = jsonnodevalue.getString(title);
                bean.image = jsonnodevalue.getString(field_activity_image_fid);

                listActivities.add(bean);

            }               
        }
        catch (JSONException e) {

            e.printStackTrace();
      }

        return null;
    }

    @Override
    public void onPostExecute(Void result) {
        // TODO Auto-generated method stub
        super.onPostExecute(result);

        pgb.setVisibility(View.GONE);
        displayAdapter();
    }
}

public void displayAdapter()
{
    adapter = new ActivityAdapter(this, listActivities);
    contests_listView.setAdapter(adapter);
    contests_listView.setOnItemClickListener(new OnItemClickListener() {

        //@Override
        public void onItemClick(AdapterView arg0, View arg1,
                int position, long id) {
            // your onclick Activity
        }

    });

}
}



    util.class
    


    public static String makeWebCall(String url) {

    DefaultHttpClient client = new DefaultHttpClient();

    HttpGet httpRequest = new HttpGet(url);
  //  HttpPost post = new HttpPost(url);

    try {

        HttpResponse httpResponse = client.execute(httpRequest);

         final int statusCode = httpResponse.getStatusLine().getStatusCode();

         if (statusCode != HttpStatus.SC_OK) {

            return null;
         }

         HttpEntity entity = httpResponse.getEntity();

         InputStream instream = null;

         if (entity != null) {
              instream = entity.getContent();
         }

            return iStream_to_String(instream);
    }
    catch (IOException e) {
        httpRequest.abort();
      // Log.w(getClass().getSimpleName(), "Error for URL =>" + url, e);
    }

    return null;

 }

public static String iStream_to_String(InputStream is1) {
    BufferedReader rd = new BufferedReader(new InputStreamReader(is1), 4096);
    String line;
    StringBuilder sb = new StringBuilder();
    try {
        while ((line = rd.readLine()) != null) {
            sb.append(line);
        }
        rd.close();

    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    String contentOfMyInputStream = sb.toString();
    return contentOfMyInputStream;
}

}

    


    ActivityBean.java
    


    public class ActivitiesBean implements Serializable{

/**
 * 
 */
private static final long serialVersionUID = 1L;

public String title;
public String image;

public String getTitle() {
    return title;
}
public void setTitle(String title) {
    this.title = title;
}
public String getImage() {
    return image;
}
public void setImage(String image) {
    this.image = image;
}

    
    
    
             
    
                                                        
    
            
            
    
              
                
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