Java 在异步http请求后更新片段UI

我正在使用loop4j进行HttpAsync获取请求

我正在调用来自片段的请求：

RestHttpClientUsage.registerUser(m_context);

这是我的rest客户端代码：

public static void registerUser(Context context) throws JSONException 
{   
    RestHttpClient.get("?Operation=RegisterUser" , params, new JsonHttpResponseHandler() 
    {                   
        @Override
        public void onSuccess(int statusCode, Header[] headers, JSONObject response) 
        {
            ...
        }

        @Override
        public void onFailure(int statusCode, Header[] headers,String responseString, Throwable throwable) 
        {
            ...
        }

    });
}

我的问题是如何从onSuccess/onFailure回调中访问调用片段

我需要在调用结束后调用我的片段UpdateUI

---

我可以从上下文对象中获取片段吗？

您可以做的只是将响应（本例中为json对象/数组）序列化为全局变量或POJO，然后您可以从loop4j上下文外部调用UI

---

这对您有意义吗？

因为它在UI线程上提供响应（您在UI上创建请求），我认为您可以这样做：

callingFragment.this.getActivity().getSupportFragmentManager().findFragmentBytag("your calling fragment tag").updatUI;

---

您可以使用专用

广播接收器
来更新UI。下面是
BroadcastReceiver
的声明：

public class MyFragment extends Fragment {
    // Declare UI elements
    private final BroadcastReceiver receiver = new MyBroadcastReceiver();

    // Initialize elements in onCreate

    @Override
    public void onResume() {
        super.onResume();
        IntentFilter filter = new IntentFilter("UPDATE_MY_FRAGMENT");
        getActivity().registerReceiver(receiver, filter);
    }

    @Override
    public void onPause() {
        super.onPause();
        getActivity().unregisterReceiver(receiver);
    }

    private class MyBroadcastReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {

            // Read data from intent.getExtras()
            // update UI elements
        }
    }
}

public static void registerUser(final Context context) throws JSONException 
{   
    RestHttpClient.get("?Operation=RegisterUser" , params, new JsonHttpResponseHandler() 
    {                   
        @Override
        public void onSuccess(int statusCode, Header[] headers, JSONObject response) 
        {
            Intent intent = new Intent("UPDATE_MY_FRAGMENT");
            // pass data using intent.putExtra based on response
            context.sendBroadcast(intent);
        }

        @Override
        public void onFailure(int statusCode, Header[] headers,String responseString, Throwable throwable) 
        {
            Intent intent = new Intent("UPDATE_MY_FRAGMENT");
            // pass data using intent.putExtra based on response
            context.sendBroadcast(intent);
        }

    });
}

并将
intent
从
registerUser
发送到私有
brodcastereceiver
：

public class MyFragment extends Fragment {
    // Declare UI elements
    private final BroadcastReceiver receiver = new MyBroadcastReceiver();

    // Initialize elements in onCreate

    @Override
    public void onResume() {
        super.onResume();
        IntentFilter filter = new IntentFilter("UPDATE_MY_FRAGMENT");
        getActivity().registerReceiver(receiver, filter);
    }

    @Override
    public void onPause() {
        super.onPause();
        getActivity().unregisterReceiver(receiver);
    }

    private class MyBroadcastReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {

            // Read data from intent.getExtras()
            // update UI elements
        }
    }
}

public static void registerUser(final Context context) throws JSONException 
{   
    RestHttpClient.get("?Operation=RegisterUser" , params, new JsonHttpResponseHandler() 
    {                   
        @Override
        public void onSuccess(int statusCode, Header[] headers, JSONObject response) 
        {
            Intent intent = new Intent("UPDATE_MY_FRAGMENT");
            // pass data using intent.putExtra based on response
            context.sendBroadcast(intent);
        }

        @Override
        public void onFailure(int statusCode, Header[] headers,String responseString, Throwable throwable) 
        {
            Intent intent = new Intent("UPDATE_MY_FRAGMENT");
            // pass data using intent.putExtra based on response
            context.sendBroadcast(intent);
        }

    });
}

保存数据不是我的问题，我的问题是如何在处理完http响应后立即调用我的片段ui update使用接口进行回调，您的片段必须实现该接口，然后查看是否有方法将回调发送到您处理响应的位置。这是否可行？