안드로이드 webview 웹뷰 사용법

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

이걸 Mainfast에 써줘야지 인터넷 웹뷰가 사용가능하다.
이 권한을 부여안해준다면 err_cache_miss란 에러가 뜬다 꼭. 꼭. 추가하도록

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context=".MainActivity">
    <RelativeLayout
        android:id="@+id/top_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <EditText
            android:id="@+id/et_url"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_toLeftOf="@id/btn_move"
            android:text="http://google.co.kr" />
        <Button
            android:id="@+id/btn_move"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:text="이동" />
    </RelativeLayout>
    <RelativeLayout
        android:id="@+id/middle_layout"
        android:layout_above="@id/bottom_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/top_layout">
        <WebView
            android:id="@+id/webview"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </RelativeLayout>
    <RelativeLayout
        android:id="@+id/bottom_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:gravity="center"
        >
        <Button
            android:id="@+id/btn_back"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Back" />
        <Button
            android:id="@+id/btn_forward"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="forward"
            android:layout_toRightOf="@id/btn_back"
            />
    </RelativeLayout>
</RelativeLayout>
package com.example.webview;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private EditText et_url;
    private Button btn_move, btn_back, btn_forward;
    private WebView webview;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et_url = findViewById(R.id.et_url);
        btn_move = findViewById(R.id.btn_move);
        btn_back = findViewById(R.id.btn_back);
        btn_forward = findViewById(R.id.btn_forward);
        webview = findViewById(R.id.webview);
        // 이벤트 장착
        webview.setWebViewClient(new MyBrowser());
        WebSettings settings = webview.getSettings();
        settings.setJavaScriptEnabled(true);
        settings.setBuiltInZoomControls(true);
        btn_move.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String url = et_url.getText().toString();
                if (url != null && url.length() > 0) {
                    webview.loadUrl(url);
                }
            }
        });
    }// oncreate close
    private class MyBrowser extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }
    }
    @Override
    public void onClick(View v) {
    }
}


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