我正在尝试从异步任务中解析后返回推文列表,但是我无法从任务中获取到ArrayList。 请问有没有人能提供一个解决方案?
public class Main extends ListActivity {
String MY_APP_TAG = "com.list";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ArrayList listItems = new ArrayList();
new myAsyncTask().execute(listItems);
setListAdapter(new ArrayAdapter(this, R.layout.tweet, R.id.tweet,listItems));
ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// When clicked, show a Toaster
Toast.makeText(getApplicationContext(), ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
}
});
}
private class myAsyncTask extends AsyncTask<ArrayList<Object>, Void, Void>
{
ArrayList<Object> listItems;
ProgressDialog dialog;
@Override
protected void onPreExecute() {
dialog = ProgressDialog.show(Main.this, "", "Loading....");
}
@Override
protected Void doInBackground(ArrayList<Object>... params) {
String host = "api.twitter.com";
String twitterURL = "http://"+host+"/1/statuses/user_timeline.json?screen_name=i1990jain&count;=10";
try {
HttpClient client = new DefaultHttpClient();
BasicHttpContext localContext = new BasicHttpContext();
HttpHost targetHost = new HttpHost(host, 80, "http");
HttpGet httpget = new HttpGet(twitterURL);
httpget.setHeader("Content-Type", "application/json");
HttpResponse response = client.execute(targetHost, httpget, localContext);
HttpEntity entity = response.getEntity();
Object content = EntityUtils.toString(entity);
Log.d(MY_APP_TAG, "OK: " + content.toString());
JSONArray ja = new JSONArray(content.toString());
for(int i = 0; i < ja.length(); i++){
JSONObject jo = ja.getJSONObject(i);
listItems.add(jo.getString("text"));
}
} catch(Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
dialog.dismiss();
}
}
}