Android WebView的使用

Java代码

<?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>

Java代码

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);

}

}

Java代码

<?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>

Java代码

<?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>

Java代码

<%@ 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>