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

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;

//****************************************************************************
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);
 }
}