1. activity_main.xml 코드

<androidx.appcompat.widget.LinearLayoutCompat
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <androidx.appcompat.widget.LinearLayoutCompat
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <EditText
            android:id="@+id/etUrl"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:hint=" URL 을 입력하세요"/>
        <androidx.appcompat.widget.AppCompatButton
            android:id="@+id/btnMove"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#63D6C9"
            android:text="이동"
            android:layout_margin="2dp"/>
        <androidx.appcompat.widget.AppCompatButton
            android:id="@+id/btnBack"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#BF5353"
            android:text="이전"
            android:layout_margin="2dp"/>
    </androidx.appcompat.widget.LinearLayoutCompat>

    <WebView
        android:id="@+id/webView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</androidx.appcompat.widget.LinearLayoutCompat>

2. MainActivity.java 코드

public class MainActivity extends AppCompatActivity {

    private EditText etUrl;
    private AppCompatButton btnMove, btnBack;
    private WebView webView;

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

    public void init(){
        etUrl = findViewById(R.id.etUrl);
        btnMove = findViewById(R.id.btnMove);
        btnBack = findViewById(R.id.btnBack);
        webView = findViewById(R.id.webView);
        webView.setWebViewClient(new WebViewClient());
    }

    public void initLr(){
        WebSettings webSet = webView.getSettings();
        webSet.setBuiltInZoomControls(true);
        webSet.setJavaScriptEnabled(true);

        btnMove.setOnClickListener(v -> {
            webView.loadUrl(etUrl.getText().toString());
        });

        btnBack.setOnClickListener(v -> {
            webView.goBack();
        });
    }
    class WebViewClient extends android.webkit.WebViewClient {

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            return super.shouldOverrideUrlLoading(view, url);
        }
    }
}

3. AndroidManifest.xml 코드

<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.com.project6_2">

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:usesCleartextTraffic="true"
        android:allowBackup="true"
        android:icon="@drawable/ic_test"
        android:label="예제 웹브라우저"
        android:roundIcon="@drawable/ic_web"
        android:supportsRtl="true"
        android:theme="@style/Theme.Project6_2">
        <activity android:name=".MainActivity"
            android:label="간단 웹브라우저">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>