在assets下新建html文件夹，在html文件夹中新建show_js.html和
delete_js.html，在res下存放一名为pic_m的图片。
在show_js.html中：
<head>
<title>我的Android博客</title>
<meta http-equiv="Content-Type" content="text/html;charset=GBK">
<script language="javascript">
function openAlert(){
window.alert("我的Android博客\nblog.sina.com.cn/u/2853310902") ;
}
function openConfirm(){
if (window.confirm("是否删除此信息？")) {
window.location = "delete_js.html" ;
}
}
</script>
</head>
<input type="button" value="弹出警告框" onclick="openAlert()">
<input type="button" value="弹出确认框" onclick="openConfirm()">
在delete_js.html中：
<head>
<title>魔乐科技软件学院：www.mldnjava.cn</title>
<meta http-equiv="Content-Type" content="text/html;charset=GBK">
</head>
<h1>信息已删除！</h1>
在main.xml中：
<?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">
<WebView
android:id="@+id/webview"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
在MyWebViewDemo.java中：
package com.li.webview;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.webkit.JsResult;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.widget.Toast;
public class MyWebViewDemo extends Activity {
private WebView webview = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.webview = (WebView) super.findViewById(R.id.webview);
this.webview.getSettings().setJavaScriptEnabled(true); // 启用JavaScript
this.webview.getSettings().setBuiltInZoomControls(true); // 控制页面缩放
this.webview.setWebChromeClient(new WebChromeClientImpl());
this.webview.loadUrl("file:/android_asset/html/show_js.html");
}
private class WebChromeClientImpl extends WebChromeClient {
@Override
public boolean onJsAlert(WebView view, String url, String message,
final JsResult result) {
Dialog dialog = new AlertDialog.Builder(MyWebViewDemo.this)
.setIcon(R.drawable.pic_m)
.setTitle("MLDN警告")
.setMessage(message)
.setPositiveButton(android.R.string.ok,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
Toast.makeText(MyWebViewDemo.this, "关闭警告框",
Toast.LENGTH_SHORT).show();
result.cancel();
}
}).create();
dialog.show() ;
return true;
}
@Override
public boolean onJsConfirm(WebView view, String url, String message,
final JsResult result) {
Dialog dialog = new AlertDialog.Builder(MyWebViewDemo.this)
.setIcon(R.drawable.pic_m)
.setTitle("确定删除？")
.setMessage(message)
.setPositiveButton("删除",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
Toast.makeText(MyWebViewDemo.this, "确定删除",
Toast.LENGTH_SHORT).show();
result.confirm();
}
})
.setNegativeButton("取消",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
Toast.makeText(MyWebViewDemo.this, "取消删除",
Toast.LENGTH_SHORT).show();
result.cancel();
}
}).create();
dialog.show() ;
return true;
}
@Override
public void onReceivedTitle(WebView view, String title) {
MyWebViewDemo.this.setTitle(title) ;
super.onReceivedTitle(view, title) ;
}
}
}
在AndroidManifest.xml中修改权限：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.li.webview"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MyWebViewDemo"
android:label="@string/title_activity_my_web_view_demo">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>