5-3-2 웹으로 요청하기

MainActivity

package com.example.boostcoursepractice;
 
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
 
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;
 
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
 
import androidx.annotation.NonNull;
import androidx.core.view.GravityCompat;
import androidx.appcompat.app.ActionBarDrawerToggle;
 
import android.view.MenuItem;
 
import com.google.android.material.navigation.NavigationView;
 
import androidx.drawerlayout.widget.DrawerLayout;
 
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.fragment.app.Fragment;
 
import android.view.Menu;
import android.widget.Button;
import android.widget.EditText;
import android.widget.FrameLayout;
import android.widget.TextView;
import android.widget.Toast;
 
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.HttpURLConnection;
import java.net.Socket;
import java.net.URL;
 
public class MainActivity extends AppCompatActivity {
 
    EditText editText;
    TextView textView;
    Handler handler = new Handler() ;
    String urlStr ;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        editText = (EditText) findViewById(R.id.editText);
        textView = (TextView) findViewById(R.id.textView);
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                urlStr = editText.getText().toString();
                RequestThread thread = new RequestThread();
                thread.start();
            }
        });
 
 
    }
 
    class RequestThread extends Thread {
        @Override
        public void run() {
            super.run();
 
            try {
                URL url = new URL(urlStr);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                if (conn != null) {
                    conn.setConnectTimeout(10000);
                    conn.setRequestMethod("GET");
                    conn.setDoInput(true);
                    conn.setDoOutput(true);
 
                    int resCode = conn.getResponseCode();
 
                    BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                    String line = null ;
 
                    while(true)
                    {
                        line = reader.readLine() ;
                        if(line == null) break ;
 
                        println(line);
                    }
                }
 
            } catch (Exception e) {
                e.printStackTrace();
            }
 
        }
    }
 
    public void println(final String data) {
 
        handler.post(new Runnable() {
 
            @Override
            public void run() {
                textView.append(data + "\n");
            }
        });
    }
}
 
 
 
 
 

 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
 
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
 
        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="요청하기" />
 
        <EditText
            android:id="@+id/editText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:inputType="textPersonName"
            android:text="http://m.naver.com" />
    </LinearLayout>
 
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/colorAccent">
 
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
 
            <TextView
                android:id="@+id/textView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
        </LinearLayout>
    </ScrollView>
 
</LinearLayout>
 

 

웹은 HTTP를 이용해서 통신을 하는 것이다. 위의 코드와 같이 하면 되고 중요한 것은 안드로이드에서는 웹을 요청할 때 스레드를 이용해서 요청한다는 것이다.

 

 

 

 

결과화면