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1. Android.webkit.Classes.WebChromeClient
	: https://developer.android.com/reference/android/webkit/WebChromeClient

1-1. Alert
	: https://developer.android.com/reference/android/webkit/WebChromeClient#onJsAlert(android.webkit.WebView,%20java.lang.String,%20java.lang.String,%20android.webkit.JsResult)
1-2. Confirm
	: https://developer.android.com/reference/android/webkit/WebChromeClient#onJsConfirm(android.webkit.WebView,%20java.lang.String,%20java.lang.String,%20android.webkit.JsResult)

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        webView.setWebChromeClient(new WebChromeClient() {

            @Override
            public boolean onJsAlert(WebView view, String url, String message, final android.webkit.JsResult result){
                new AlertDialog.Builder(view.getContext())
                        .setTitle("KMCERT ALERT")
                        .setMessage(message)
                        .setPositiveButton(android.R.string.ok,
                                new AlertDialog.OnClickListener(){
                                    public void onClick(DialogInterface dialog, int which) {
                                        result.confirm();
                                    }
                                })
                        .setCancelable(true)
                        .create()
                        .show();

                return true;
            };

            @Override
            public boolean onJsConfirm(WebView view, String url, String message, final android.webkit.JsResult result){
                new AlertDialog.Builder(view.getContext())
                        .setTitle("KMCERT CONFIRM")
                        .setMessage(message)
                        .setPositiveButton(android.R.string.ok,
                                new DialogInterface.OnClickListener() {
                                    public void onClick(DialogInterface dialog, int which) {
                                        result.confirm();
                                    }
                                })
                        .setNegativeButton(android.R.string.cancel,
                                new DialogInterface.OnClickListener() {
                                    public void onClick(DialogInterface dialog, int which) {
                                        result.cancel();
                                    }
                                })
                        .create()
                        .show();
                return true;
            };
        });