在Android的webview中定做js的alert,confirm和prompt对话框的方法

在Android的webview中定制js的alert,confirm和prompt对话框的方法
http://618119.com/archives/2010/12/20/199.html
1.首先继承android.webkit.WebChromeClient实现MyWebChromeClient。

2.在MyWebChromeClient.java中覆盖onJsAlert,onJsConfirm,onJsPrompt三个方法。

3.在初始化Webview时设置调用webview.setWebChromeClient(new MyWebChromeClient());

4.在Webview载入的html中使用window.alert,window.confirm,window.prompt方法，系统弹出的将是自定义实现的对应对话框。

MyWebChromeClient.java的代码如下：

Java代码


import android.app.AlertDialog;

import android.content.DialogInterface;

import android.content.DialogInterface.OnCancelListener;

import android.content.DialogInterface.OnClickListener;

import android.content.DialogInterface.OnKeyListener;

import android.graphics.Bitmap;

import android.os.Message;

import android.util.Log;

import android.view.KeyEvent;

import android.webkit.JsPromptResult;

import android.webkit.JsResult;

import android.webkit.WebChromeClient;

import android.webkit.WebView;

import android.widget.EditText;

/**

* http://618119.com/archives/2010/12/20/199.html
*/

//****************************************************************************

public class MyWebChromeClient extends WebChromeClient {

@Override

public void onCloseWindow(WebView window) {

super.onCloseWindow(window);

}

@Override

public boolean onCreateWindow(WebView view, boolean dialog,

boolean userGesture, Message resultMsg) {

return super.onCreateWindow(view, dialog, userGesture, resultMsg);

}

/**

* 覆盖默认的window.alert展示界面，避免title里显示为“：来自file:////”

*/

public boolean onJsAlert(WebView view, String url, String message,

JsResult result) {

final AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext());

builder.setTitle("对话框")

.setMessage(message)

.setPositiveButton("确定", null);

// 不需要绑定按键事件

// 屏蔽keycode等于84之类的按键

builder.setOnKeyListener(new OnKeyListener() {

public boolean onKey(DialogInterface dialog, int keyCode,KeyEvent event) {

Log.v("onJsAlert", "keyCode==" + keyCode + "event="+ event);

return true;

}

});

// 禁止响应按back键的事件

builder.setCancelable(false);

AlertDialog dialog = builder.create();

dialog.show();

result.confirm();// 因为没有绑定事件，需要强行confirm,否则页面会变黑显示不了内容。

return true;

// return super.onJsAlert(view, url, message, result);

}

public boolean onJsBeforeUnload(WebView view, String url,

String message, JsResult result) {

return super.onJsBeforeUnload(view, url, message, result);

}

/**

* 覆盖默认的window.confirm展示界面，避免title里显示为“：来自file:////”

*/

public boolean onJsConfirm(WebView view, String url, String message,

final JsResult result) {

final AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext());

builder.setTitle("对话框")

.setMessage(message)

.setPositiveButton("确定",new OnClickListener() {

public void onClick(DialogInterface dialog,int which) {

result.confirm();

}

})

.setNeutralButton("取消", new OnClickListener() {

public void onClick(DialogInterface dialog, int which) {

result.cancel();

}

});

builder.setOnCancelListener(new OnCancelListener() {

@Override

public void onCancel(DialogInterface dialog) {

result.cancel();

}

});

// 屏蔽keycode等于84之类的按键，避免按键后导致对话框消息而页面无法再弹出对话框的问题

builder.setOnKeyListener(new OnKeyListener() {

@Override

public boolean onKey(DialogInterface dialog, int keyCode,KeyEvent event) {

Log.v("onJsConfirm", "keyCode==" + keyCode + "event="+ event);

return true;

}

});

// 禁止响应按back键的事件

// builder.setCancelable(false);

AlertDialog dialog = builder.create();

dialog.show();

return true;

// return super.onJsConfirm(view, url, message, result);

}

/**

* 覆盖默认的window.prompt展示界面，避免title里显示为“：来自file:////”

* window.prompt('请输入您的域名地址', '618119.com');

*/

public boolean onJsPrompt(WebView view, String url, String message,

String defaultValue, final JsPromptResult result) {

final AlertDialog.Builder builder = new AlertDialog.Builder(view.getContext());

builder.setTitle("对话框").setMessage(message);

final EditText et = new EditText(view.getContext());

et.setSingleLine();

et.setText(defaultValue);

builder.setView(et)

.setPositiveButton("确定", new OnClickListener() {

public void onClick(DialogInterface dialog, int which) {

result.confirm(et.getText().toString());

}

})

.setNeutralButton("取消", new OnClickListener() {

public void onClick(DialogInterface dialog, int which) {

result.cancel();

}

});

// 屏蔽keycode等于84之类的按键，避免按键后导致对话框消息而页面无法再弹出对话框的问题

builder.setOnKeyListener(new OnKeyListener() {

public boolean onKey(DialogInterface dialog, int keyCode,KeyEvent event) {

Log.v("onJsPrompt", "keyCode==" + keyCode + "event="+ event);

return true;

}

});

// 禁止响应按back键的事件

// builder.setCancelable(false);

AlertDialog dialog = builder.create();

dialog.show();

return true;

// return super.onJsPrompt(view, url, message, defaultValue,

// result);

}

@Override

public void onProgressChanged(WebView view, int newProgress) {

super.onProgressChanged(view, newProgress);

}

@Override

public void onReceivedIcon(WebView view, Bitmap icon) {

super.onReceivedIcon(view, icon);

}

@Override

public void onReceivedTitle(WebView view, String title) {

super.onReceivedTitle(view, title);

}

@Override

public void onRequestFocus(WebView view) {

super.onRequestFocus(view);

}

}