PowenKo, Android, Tutorial 054-3, internet, WebView in view and display loading progress

package com.powenko.Tutorial_UI_WebView_onProgressChanged;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.KeyEvent;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class Tutorial_UI_WebView_onProgressChangedActivity extends Activity {
private WebView webview;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        webview = (WebView) findViewById(R.id.webView1);
        webview.getSettings().setJavaScriptEnabled(true);
        webview.loadUrl("http://www.powenko.com/en");

        webview.setWebViewClient(new HelloWebViewClient());

        final Activity activity = this;
        webview.setWebChromeClient(new WebChromeClient() {

     	   public void onProgressChanged(WebView view, int progress)
            {

                if(progress == 100){
                    activity.setTitle(R.string.app_name);
                }else{
                	 activity.setTitle("Loading..."+progress);
                     activity.setProgress(progress * 100);

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

    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) {
            webview.goBack();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }
    private class HelloWebViewClient extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }
    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />
       <android.webkit.WebView android:id="@+id/webView1" android:layout_width="fill_parent" android:layout_height="fill_parent"></android.webkit.WebView>

</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.powenko.Tutorial_UI_WebView_onProgressChanged"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="4" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Tutorial_UI_WebView_onProgressChangedActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

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

sample code:
Tutorial_UI_WebView_onProgressChangedActivity