android webview网页控件

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

    <WebView
            android:id="@+id/webview"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"/>

</LinearLayout>

package com.example.basicUI;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ZoomButtonsController;

import java.lang.reflect.Field;

/**
 * 作者：Heyiyong，2014年2月1日23:53:18
 */
public class MainActivity extends FragmentActivity {

    private WebView webView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        webView = (WebView) findViewById(R.id.webview);
        webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
        WebSettings webSettings = webView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setBuiltInZoomControls(true);
        webView.loadUrl("http://www.baidu.com/");
        setZoomControlGone(webView);
        webView.setWebViewClient(new MyWebViewClient());
    }

    /**
     * 为了能够响应链接继续在本webview控件中显示，要声明此类。
     * 如果没有这个类，点击了一个链接后，系统会自动选择浏览器浏览
     */
    private class MyWebViewClient extends WebViewClient {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }
    }

    /**
     * 设置webview的后退，如果后退没有网页了，则关闭该activity
     */
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
            webView.goBack();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    /**
     * 隐藏放大缩小控件
     */
    public void setZoomControlGone(View view) {
        Class classType;
        Field field;
        try {
            classType = WebView.class;
            field = classType.getDeclaredField("mZoomButtonsController");
            field.setAccessible(true);
            ZoomButtonsController mZoomButtonsController = new ZoomButtonsController(
                    view);
            mZoomButtonsController.getZoomControls().setVisibility(View.GONE);
            try {
                field.set(view, mZoomButtonsController);
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
    }
}

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