新线程网络请求，回调方法在主线程中进行

最新推荐文章于 2022-05-10 11:43:01 发布

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最新推荐文章于 2022-05-10 11:43:01 发布

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分类专栏： Android 文章标签： android

本文链接：https://blog.youkuaiyun.com/qq_28597523/article/details/50475971

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新建HttpUtil类
写出其中的Http请求方法sendHttpRequest,定义回调接口。

public class HttpUtil {
    public static void sendHttpRequest(final String address,final HttpCallbackListenner listener){
        new Thread(new Runnable() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                HttpURLConnection connection=null;
                try {
                    URL url=new URL(address);
                    connection=(HttpURLConnection) url.openConnection();
                    connection.setReadTimeout(8000);
                    connection.setConnectTimeout(8000);
                    connection.setRequestMethod("GET");
                    InputStream is=connection.getInputStream();
                    BufferedReader reader=new BufferedReader(new InputStreamReader(is));
                    String str;
                    StringBuilder response=new StringBuilder();
                    while((str=reader.readLine())!=null){
                        response.append(str);
                    }
                    if(listener!=null){
                        listener.onComplete(response.toString());
                    }
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    if(listener!=null)
                        listener.onError(e);
                }
                finally{
                    if(connection!=null)
                        connection.disconnect();
                }
            }
        }).start();
    }
    public interface HttpCallbackListenner{
        void onComplete(String response);
        void onError(Exception e);
    }
}

现在onComplete和onError方法是在新开线程总执行的，不能进行更新UI等一系列操作，所以需要我们新建方法requestInMainThread方法，让回调能在主线程中进行：

private Handler handler = new Handler(Looper.getMainLooper());
    public void requestInMainLooper(String address,final HttpCallbackListenner listener) {
        sendHttpRequest(address, new HttpCallbackListenner() {

            @Override
            public void onComplete(final String response) {
                handler.post(new Runnable() {

                    @Override
                    public void run() {
                        listener.onComplete(response);
                    }
                });
            }
            @Override
            public void onError(final Exception e) {
                handler.post(new Runnable() {

                    @Override
                    public void run() {
                        listener.onError(e);
                    }
                });
            }

        });
    }

end.