android-async-http

添加依賴：

compile ‘com.loopj.android:android-async-http:1.4.9’

代碼實現：

public class  AsyncHttpHelper extends AsyncHttpResponseHandle{
private List<User> userData;
private Context context;
private ListView listView;
private static AsyncHttpHelper instance;
//單例模式
private AsyncHttpHelper(){}
public static AsyncHttpHelper getInstance(Context context,ListView listView){
if(instance==null){
   instance=new AsyncHttpHelper();
 }
 instance.context=context;
 instance.listView=listView;
 return instance;
}
public static AsyncHttpHelper getInstance(){
    return instance;
}
public List<User> getUserData(){
    return userData;
}
  public void updateUserDate() {
        if (userData == null) {
            userData = new ArrayList<>();
        }
        userData.clear();
        AsyncHttpClient client = AsyncHttpClientHelper.getInstance();
        client.get(URL, this);
    }

private void onSuccessReferenceView() {
        if (context != null && listView != null) {
                listView.setAdapter(newUserAdapter(context,userData));
        }
public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
        String result = new String(responseBody);
        Log.d("JokeHelper", result);
        try {
            JSONObject object = new JSONObject(result);
            if (object.has("reason")) {
                JSONObject objectJSONObject = object.getJSONObject("result");
                JSONArray data = objectJSONObject.getJSONArray("data");
                for (int i = 0; i < data.length(); i++) {
                    JSONObject ob = data.getJSONObject(i);
                    JokeBean joke = new JokeBean();
                    joke.setId(i);
                    joke.setTitle(ob.getString("content"));
                    jokeList.add(joke);
                }
                onSuccessReferenceView();
            } else {
                if (context != null) {
                    Toast.makeText(context, "請求失敗", Toast.LENGTH_LONG).show();
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
        if (context != null) {
            Toast.makeText(context, "請求網絡失敗", Toast.LENGTH_SHORT).show();
        }
    }

 }