android之WebView的使用

为了先体验一下效果，截了一个图

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" />
	<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);
	}
    
}

prom_dialog.xml

<?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> 

注意不要忘记加上网络权限啊！

<%@ 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>