Android WebView的使用

<?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" />
        <EditText android:hint="请输入URL" android:id="@+id/EditText01"
                android:layout_width="fill_parent" android:layout_height="wrap_content"></EditText>
        <Button android:text="OK" android:id="@+id/Button01"
                android:layout_width="fill_parent" android:layout_height="wrap_content"></Button>
        <WebView android:id="@+id/WebView" android:layout_width="fill_parent"
                android:layout_height="wrap_content"></WebView>
</LinearLayout>

package com.Aina.Android;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.webkit.JsPromptResult;
import android.webkit.JsResult;
import android.webkit.URLUtil;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Test extends Activity {
    /** Called when the activity is first created. */
        private EditText et = null;
        private Button btn = null;
        private WebView wv = null;
        private WebSettings ws = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        et = (EditText) this.findViewById(R.id.EditText01);
        btn = (Button) this.findViewById(R.id.Button01);
        wv = (WebView) this.findViewById(R.id.WebView);
        ws = wv.getSettings();
        ws.setAllowFileAccess(true);//设置允许访问文件数据
        ws.setJavaScriptEnabled(true);//设置支持javascript脚本
        ws.setBuiltInZoomControls(true);//设置支持缩放
        wv.setWebViewClient(new WebViewClient(){
                public boolean shouldOverrideUrlLoading(WebView view,String url){
                        //当有新连接时，使用当前的 WebView
                        view.loadUrl(url);
                        return true;
                }
        });
        wv.setWebChromeClient(new WebChromeClient(){
                public boolean onJsAlert(WebView view,String url,String message,final JsResult result){
                        //构建一个Builder来显示网页中的alert对话框
                        Builder builder = new Builder(Test.this);
                        builder.setTitle("提示对话框");
                        builder.setMessage(message);
                        builder.setPositiveButton(android.R.string.ok, new AlertDialog.OnClickListener(){

                                        @Override
                                        public void onClick(DialogInterface dialog, int which) {
                                                // TODO Auto-generated method stub
                                                result.confirm();
                                        }
                                
                        });
                        builder.setCancelable(false);
                        builder.create();
                        builder.show();
                        return true;
                }
                public boolean onJsConfirm(WebView view,String url,String message,final JsResult result){
                        Builder builder = new Builder(Test.this);
                        builder.setTitle("带选择的对话框");
                        builder.setMessage(message);
                        builder.setPositiveButton(android.R.string.ok, new AlertDialog.OnClickListener(){

                                        @Override
                                        public void onClick(DialogInterface dialog, int which) {
                                                // TODO Auto-generated method stub
                                                result.confirm();
                                        }
                                
                        });
                        builder.setNeutralButton(android.R.string.cancel, new AlertDialog.OnClickListener(){

                                        @Override
                                        public void onClick(DialogInterface dialog, int which) {
                                                // TODO Auto-generated method stub
                                                result.cancel();
                                        }
                                        
                        });
                        builder.setCancelable(false);
                        builder.create();
                        builder.show();
                        return true;
                }
                public boolean onJsPrompt(WebView view,String url,String message,String defaultValue,final JsPromptResult result){
                        LayoutInflater inflater = LayoutInflater.from(Test.this);
                        final View v = inflater.inflate(R.layout.prom_dialog, null);
                        //设置 TextView对应网页中的提示信息
                        ((TextView)v.findViewById(R.id.TextView_PROM)).setText(message);
                        //设置EditText对应网页中的输入框
                        ((EditText)v.findViewById(R.id.EditText_PROM)).setText(defaultValue);
                        Builder builder = new Builder(Test.this);
                        builder.setTitle("带输入的对话框 ");
                        builder.setView(v);
                        builder.setPositiveButton(android.R.string.ok, new AlertDialog.OnClickListener(){

                                        @Override
                                        public void onClick(DialogInterface dialog, int which) {
                                                // TODO Auto-generated method stub
                                                String value = ((EditText)v.findViewById(R.id.EditText_PROM)).getText().toString();
                                                result.confirm(value);
                                        }
                                
                        });
                        builder.setNegativeButton(android.R.string.cancel, new AlertDialog.OnClickListener(){

                                        @Override
                                        public void onClick(DialogInterface dialog, int which) {
                                                // TODO Auto-generated method stub
                                                result.cancel();
                                        }
                                
                        });
                        builder.setOnCancelListener(new DialogInterface.OnCancelListener(){

                                        @Override
                                        public void onCancel(DialogInterface dialog) {
                                                // TODO Auto-generated method stub
                                                result.cancel();
                                        }
                                
                        });
                        builder.create();
                        builder.show();
                        return true;
                }
                //设置网页加载的进度条
                public void onProgressChanged(WebView view,int newProgress){
                        Test.this.getWindow().setFeatureInt(Window.FEATURE_PROGRESS, newProgress*100);
                        super.onProgressChanged(view, newProgress);
                }
                //设置应用程序的标题
                public void onReceivedTitle(WebView view,String title){
                        Test.this.setTitle(title);
                        super.onReceivedTitle(view, title);
                }
        });
        btn.setOnClickListener(new Button.OnClickListener(){

                        @Override
                        public void onClick(View v) {
                                // TODO Auto-generated method stub
                                String url = et.getText().toString();
                                //判断输入的内容是不是网址
                                if(URLUtil.isNetworkUrl(url)){
                                        wv.loadUrl(url);
                                }else{
                                        et.setHint("输入的网址不合法，请重新输入");
//                                      et.setText("输入的网址不合法，请重新输入");
                                }
                        }
                
        });
    }
        @Override
        public boolean onKeyDown(int keyCode, KeyEvent event) {
                if(keyCode==KeyEvent.KEYCODE_BACK && wv.canGoBack()){
                        wv.goBack();//返回前一个页面
                        return true;
                }
                return super.onKeyDown(keyCode, event);
        }
    
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    >
    <TextView 
        android:id="@+id/TextView_PROM"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
    <EditText 
        android:id="@+id/EditText_PROM"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:selectAllOnFocus="true"
        android:scrollHorizontally="true"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.Aina.Android" android:versionCode="1" android:versionName="1.0">
        <application android:icon="@drawable/icon" android:label="@string/app_name">
                <activity android:name=".Test" 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> 

<%@ page language="java" contentType="text/html; charset=GBK" pageEncoding="GBK"%>

<html>
  <head>
    <title>index.jsp</title>
<script type="text/JavaScript">   
function s(){
alert("Good Morning!");    
}
function d(){
confirm("Are you ok?")
}
function f(){
prompt("What’s your name?")
}
</script> 
  </head>
  
  <body>
  下面我们演示三种对话框
  <br/><br/>
  <input type="button" value="警告，提醒对话框" onclick="s()">
  <br/><br/>
  <input type="button" value="带选择的对话框" onclick="d()">
  <br/><br/>
  <input type="button" value="要求用户输入的对话框" onclick="f()">
  </body>
</html>