我试图通过创建连接到服务器的HttpUrlConnection和BufferedReader进行读取来解析JSON。但是获取NetworkOnMainThreadException

Question

当前，我正在使用SdkVersion28。在运行虚拟设备并单击时。结果程序崩溃了。希望HttpUrlConnection或语法中可能存在问题。请找出我的问题。 ：（

 btnHit.setOnClickListener(new View.OnClickListener() {

         @Override
         public void onClick(View v) {
         HttpURLConnection connection = null;
         BufferedReader reader = null;
               try {
                URL url= new URL("https://jsonparsingdemo- 
            cec5b.firebaseapp.com/jsonData/moviesDemoItem.txt");
            connection= (HttpURLConnection)url.openConnection();
            connection.connect();

                InputStream stream= connection.getInputStream();
                reader= new BufferedReader(new 
                InputStreamReader(stream));
                StringBuffer buffer= new StringBuffer();
                String line;

                while((line= reader.readLine()) != null){
                    buffer.append(line);
                }
                tvData.setText("buffer");
                 } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if(connection != null) {
                    connection.disconnect();
                }
                try {
                    if(reader != null){
                        reader.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    });

   **Error is coming out--**

     E/AndroidRuntime: FATAL EXCEPTION: main
     android.os.NetworkOnMainThreadException
     DelegatingHttpsURLConnection.connect
          (DelegatingHttpsURLConnection.java:89)
     HttpsURLConnectionImpl.connect(Unknown Source:0)
    at com.example.akashb.jsons.Activity1$1.onClick(Activity1.java)
    ActivityThread.main(ActivityThread.java:6494)
    at java.lang.reflect.Method.invoke(Native Method)