[안드로이드]networkonmainthreadexception 오류

알면 별거 아닌데, 몇일 동안 끙끙 구굴링, 삽질하다가 찾아 냈다..

 

networkonmainthreadexception 오류는 프로그램 정책을 바꾸면 된다.

 

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);
        
        .........
	}
}

 

package com.example.myapplication;

import android.net.Uri;
import android.os.Bundle;
import android.os.StrictMode;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class MainActivity extends AppCompatActivity {
    private static final String TAG = null ;
    HttpURLConnection conn;
    URL url = null;
    //

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);


        TextView textview = (TextView)findViewById(R.id.textview);

        try {

            // Enter URL address where your php file resides
            url = new URL("http://192.168.168.227/b.php");
            textview.setText(url + "성공......");
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            textview.setText(e.toString());
            e.printStackTrace();
        }


        try {
            // Setup HttpURLConnection class to send and receive data from php and mysql
            conn = (HttpURLConnection)url.openConnection();
            //conn.setReadTimeout(READ_TIMEOUT);
            //conn.setConnectTimeout(CONNECTION_TIMEOUT);
            conn.setRequestMethod("POST");

            // setDoInput and setDoOutput method depict handling of both send and receive
            conn.setDoInput(true);
            conn.setDoOutput(true);

            // Append parameters to URL
            String[] params = new String[5];

            params[0] = "홍길동";
            params[1] = "1234";

            Uri.Builder builder = new Uri.Builder()
                    .appendQueryParameter("name", params[0])
                    .appendQueryParameter("pwd", params[1]);

            String query = builder.build().getEncodedQuery();

            textview.setText("파라메터 : " + query);

            try {
                // Open connection for sending data
                OutputStream os = conn.getOutputStream();
                BufferedWriter writer = new BufferedWriter(
                        new OutputStreamWriter(os, "UTF-8"));

                writer.write(query);
                writer.flush();
                writer.close();
                os.close();

                if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
                    textview.setText("성공.....");

                    BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
                    String line;
                    String page = "";

                    // 라인을 받아와 합친다.
                    while ((line = reader.readLine()) != null){
                        page += line;
                    }
                    textview.setText(page);

                }
                else {

                    textview.setText("실패....");
                }

                conn.connect();

            } catch (Exception e) {
                textview.setText(e.toString());
            }


        } catch (IOException e1) {
            // TODO Auto-generated catch block
            textview.setText(e1.toString());

            e1.printStackTrace();
        }

    }
}