Handler mhandler=new Handler(){
    @Override
    public void handleMessage(Message msg) {
      super.handleMessage(msg);
      //数据处理逻辑
    }
  };

new JsonText(mhandler);

public class JsonTest {
  Handler handler;
  public JsonTest(Handler handler) {
    this.handler = handler;
    thread.start();
  }

  Thread thread=new Thread(new Runnable() {
    @Override
    public void run() {
      Message msg=new Message();
      try{
        InputStream in=null;
        HttpURLConnection connection=null;
        URL url=new URL("http://guolin.tech/api/china");
        connection=(HttpURLConnection)url.openConnection();
        connection.setRequestMethod("GET");//设置请求方式，可以不设置，默认是GET
        connection.setConnectTimeout(5000);//设置请求超时时间
        in=connection.getInputStream();
        msg.arg1=0x01;
        msg.obj=in.toString();
        handler.sendMessage(msg);
      }catch (Exception e){
        e.printStackTrace();
        msg.arg1=0x02;
        handler.sendMessage(msg);
      }finally {
        connection.disconnect();
      }
    }
  });
}

dependencies {
compile 'com.squareup.okhttp3:okhttp:3.4.1'
}

OkHttpClient client =new OkHttpClient();
//创建实例
Request request =new Request.Builder().build();

Request request =new Request.Builder().url("www.baidu.com").build();

Response response=client.newCall(request).excute();
String str=response..body().toString();//得到值