我是安卓新手。我为 JSON 解析编写了一个代码。在这段代码中，我需要反复调用 JSON Web 服务。我该怎么做。请帮我
代码：
public class MainActivity extends Activity implements OnItemClickListener {
private static final String rssFeed = "https://www.dropbox.com/s/rhk01nqlyj5gixl/jsonparsing.txt?dl=1";
private static final String ARRAY_NAME = "student";
private static final String ID = "id";
private static final String NAME = "name";
private static final String CITY = "city";
private static final String GENDER = "Gender";
private static final String AGE = "age";
private static final String BIRTH_DATE = "birthdate";
List<Item> arrayOfList;
ListView listView;
NewsRowAdapter objAdapter;
private static final String TAG = "Your Service";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
listView = (ListView) findViewById(R.id.listview);
listView.setOnItemClickListener(this);
arrayOfList = new ArrayList<Item>();
if (Utils.isNetworkAvailable(MainActivity.this)) {
new MyTask().execute(rssFeed);
} else {
//showToast("No Network Connection!!!");
}
}
// My AsyncTask start...
class MyTask extends AsyncTask<String, Void, String> {
ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Loading...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected String doInBackground(String... params) {
return Utils.getJSONString(params[0]);
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if (null != pDialog && pDialog.isShowing()) {
pDialog.dismiss();
}
if (null == result || result.length() == 0) {
showToast("No data found from web!!!");
MainActivity.this.finish();
} else {
try {
JSONObject mainJson = new JSONObject(result);
JSONArray jsonArray = mainJson.getJSONArray(ARRAY_NAME);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject objJson = jsonArray.getJSONObject(i);
Item objItem = new Item();
objItem.setId(objJson.getInt(ID));
objItem.setName(objJson.getString(NAME));
objItem.setCity(objJson.getString(CITY));
objItem.setGender(objJson.getString(GENDER));
objItem.setAge(objJson.getInt(AGE));
objItem.setBirthdate(objJson.getString(BIRTH_DATE));
arrayOfList.add(objItem);
}
} catch (JSONException e) {
e.printStackTrace();
}
Collections.sort(arrayOfList, new Comparator<Item>() {
@Override
public int compare(Item lhs, Item rhs) {
return (lhs.getAge() - rhs.getAge());
}
});
setAdapterToListview();
}
}
}
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
showDeleteDialog(position);
}
private void showDeleteDialog(final int position) {
AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this)
.create();
alertDialog.setTitle("Delete ??");
alertDialog.setMessage("Are you sure want to Delete it??");
alertDialog.setButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
alertDialog.setButton2("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
arrayOfList.remove(position);
objAdapter.notifyDataSetChanged();
}
});
alertDialog.show();
}
public void setAdapterToListview() {
objAdapter = new NewsRowAdapter(MainActivity.this, R.layout.row,
arrayOfList);
listView.setAdapter(objAdapter);
}
public void showToast(String msg) {
Toast.makeText(MainActivity.this, msg, Toast.LENGTH_LONG).show();
}
}