WebView

1.Permission

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

2.WebView

class MainActivity : AppCompatActivity() {

    @RequiresApi(Build.VERSION_CODES.KITKAT)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        setButtons()
        setWebView()

    }

    fun setWebView(){

        var url: String? = "https://naver.com"

        // 웹뷰의 인스턴스를 가져온다
        val settings = webView.settings

        // 자바스크립트 사용가능 유무
        settings.javaScriptEnabled = true

        // cache유무
        settings.setAppCacheEnabled(true)
        settings.cacheMode = WebSettings.LOAD_DEFAULT
        settings.setAppCachePath(cacheDir.path)


        // zoom
        settings.setSupportZoom(true)
        settings.builtInZoomControls = true
        settings.displayZoomControls = true


        // 텍스트만 zoom
        //settings.textZoom = 125


        // 웹뷰에서 이미지 보지 않기설정
        settings.blockNetworkImage = false
        // 웹뷰가 이미지의 리소스를 로드할 것인지 유무
        settings.loadsImagesAutomatically = true


        // More web view settings
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            settings.safeBrowsingEnabled = true  // api 26
        }

        //settings.pluginState = WebSettings.PluginState.ON
        settings.useWideViewPort = true
        settings.loadWithOverviewMode = true
        settings.javaScriptCanOpenWindowsAutomatically = true
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            settings.mediaPlaybackRequiresUserGesture = false
        }

        // More optional settings, you can enable it by yourself
        settings.domStorageEnabled = true
        settings.setSupportMultipleWindows(true)
        settings.loadWithOverviewMode = true
        settings.allowContentAccess = true
        settings.setGeolocationEnabled(true)
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            settings.allowUniversalAccessFromFileURLs = true
        }

        settings.allowFileAccess = true

        // webView settings
        webView.fitsSystemWindows = true

        /* SDK version 19이상이면 하드웨어가속, 그렇지 않으면 소프트웨어 가속  */
        webView.setLayerType(View.LAYER_TYPE_HARDWARE, null)
        webView.loadUrl(url)


        // Set web view client
        webView.webViewClient = object : WebViewClient() {
            override fun onPageStarted(view: WebView, url: String, favicon: Bitmap?) {
                // Page loading started
                // Do something
                Log.d("SSS","OnPageStart: " + url)
            }

            override fun onPageFinished(view: WebView, url: String) {
                // Page loading finished
                // Enable disable back forward button
                Log.d("SSS","페이지 로딩 종료")

            }
        }
    }


    fun setButtons(){

        link1_btn.setOnClickListener {
            webView.loadUrl("http://naver.com")
        }

        link2_btn.setOnClickListener {
            webView.loadUrl("http://sunpil.tistory.com")
        }
    }
}