개발자연습생

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"
    tools:context=".MainActivity">

    <!-- WebView 생성 -->
    <WebView
        android:id="@+id/webView"	<!-- MainActivity.java로 보낼 ID -->
        android:layout_width="match_parent"
        android:layout_height="match_parent"></WebView>

</LinearLayout>

MainActivity.java

package com.example.study_1;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.KeyEvent;
import android.webkit.WebChromeClient;
import android.webkit.WebResourceRequest;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends AppCompatActivity {

    private WebView webView;
    private String url = "https://www.google.com";  // 접속할 URL

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

        webView = (WebView) findViewById(R.id.webView);
        webView.getSettings().setJavaScriptEnabled(true); // 스크립트 실행 허용 여부
        webView.loadUrl(url);	// 앱 실행시 접속할 URL
        webView.setWebChromeClient(new WebChromeClient());   // 크롬으로 열기
        webView.setWebViewClient(new WebViewClientClass());  // 웹뷰 열기
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
		// 뒤로가기 버튼 처리
        if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
            webView.goBack();
            return true;
        }

        return super.onKeyDown(keyCode, event);
    }
	
    // 웹뷰 실행하여 URL접속
    private class WebViewClientClass extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
            view.loadUrl(String.valueOf(request.getUrl()));
            return true;
        }

//        안드로이드 27버전 이후로 잠겼음
//        @Override
//        public boolean shouldOverrideUrlLoading(WebView view, String url) {
//            view.loadUrl(url);
//            return true;
//        }
    }
}

AndriodManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">
	
    <!-- 이 부분 추가 -->
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/Theme.Study_1"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

출처 : 인프런 홍드로이드님 강의 중.