连接网络请求+Get请求+AsyncTask

public class Http {

    //网络连接
    public static boolean isNetWorkConnected(Context context){
        if (context!=null){
            ConnectivityManager connectivityManager= (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo info = connectivityManager.getActiveNetworkInfo();
            if (info!=null){
                return  info.isAvailable();
            }
        }
        return false;
    }

    //GET请求
    public  static String HttpGet(String strurl){
        try {
            URL url=new URL(strurl);
            HttpURLConnection connection= (HttpURLConnection) url.openConnection();
            //设置请求方式
            connection.setRequestMethod("GET");
            //设置连接主机时间
            connection.setConnectTimeout(5000);
            //设置读取时间
            connection.setReadTimeout(5000);
            int code = connection.getResponseCode();
            if (code==HttpURLConnection.HTTP_OK){
                InputStream inputStream = connection.getInputStream();
                BufferedReader reader=new BufferedReader(new InputStreamReader(inputStream,"utf-8"));
                String str="";
                StringBuilder builder=new StringBuilder();
                while ((str=reader.readLine())!=null){
                    builder.append(str);
                }
                return builder.toString();
            }
            connection.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return  null;
    }
    //AsyncTask
    public static void MyAsyncTask(String str,final CallBackSSS callBackSSS){
        new AsyncTask<String,Integer,String>(){

            @Override
            protected String doInBackground(String... strings) {
                return HttpGet(strings[0]);
            }

            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                callBackSSS.getData(s);
            }
        }.execute(str);
    }
    public interface CallBackSSS{
        void getData(String s);
    }
}

//AsyncTask使用
if (Http.isNetWorkConnected(ShowActivity.this)) {
Http.MyAsyncTask(str, new Http.CallBackSSS() {
@Override
public void getData(String s) {
Gson gson = new Gson();
JsonBean jsonBean = gson.fromJson(s, JsonBean.class);
data = jsonBean.getData();
adapter_xlv = new MyBaseAdapter_xlv(data, ShowActivity.this);
xlv.setAdapter(adapter_xlv);

            }
        });