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 {



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>