android WebView onJsAlert onJsConfirm

package com.html;

import com.sqlite.Dao.NcpRegisterDAO;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.webkit.JsResult;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.widget.Toast;

public class Register_protocolActivity extends Activity {
  

    private Handler mHandler = new Handler();
    private WebView mWebView;
    private NcpRegisterDAO dao = null;
   
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
       
        //踩上一脚，记录有了就知道复位的时候要去哪里
        dao = new NcpRegisterDAO(Register_protocolActivity.this);
        String name = "MainActivity";
        dao.add_Stepped(name);
       
        //隐藏标题栏
        //requestWindowFeature(Window.FEATURE_NO_TITLE);
        //隐藏状态栏
        //getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
        //该ACTIVITY不需要layout设置，所以直接指向MainActivity的main
        setContentView(R.layout.protocol);
        //将WebView实例化
        mWebView = (WebView) this.findViewById(R.id.webView);
        //WebView打开权限
        mWebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
        mWebView.getSettings().setJavaScriptEnabled(true);
        //WebView，SWF文件运行权限
        mWebView.getSettings().setPluginsEnabled(true);

        mWebView.addJavascriptInterface(new Action(), "ncp"); 
    
       mWebView.loadUrl("file:///android_asset/protocol.html");

      
         
          // 创建WebViewChromeClient
               WebChromeClient wvcc = new WebChromeClient() {            
          // 处理Alert事件
            
             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(Register_protocolActivity.this);
                                 builder.setTitle("计算1+2的值");
                                 builder.setMessage(message);
                                 builder.setPositiveButton(android.R.string.ok, new AlertDialog.OnClickListener() {
                                     @Override
                                     public void onClick(DialogInterface dialog, int which) {
                                         result.confirm();
                                     }
                                 });
                                builder.setCancelable(false);
                                 builder.create();
                                 builder.show();
                                 return true;
                             }
            
            
             // 处理Confirm事件
                     public boolean onJsConfirm(WebView view, String url, String message, final JsResult result) {
                         Builder builder = new Builder(Register_protocolActivity.this);
                         builder.setTitle("退出确认");
                         builder.setMessage(message);
                         builder.setPositiveButton(android.R.string.ok, new AlertDialog.OnClickListener() {
                             public void onClick(DialogInterface dialog, int which) {
                                 //result.confirm();
                                // 从协义开始到发送注册信息，这些步骤退出后直接清零复位表，不然如果非正常关机后再重启会再次进入该页
                                dao.Clear_NcpStep_Set0();
                                 finish();
                                
                             }
        
                         });
                         builder.setNeutralButton(android.R.string.cancel, new AlertDialog.OnClickListener() {
        
                          public void onClick(DialogInterface dialog, int which) {
                                 result.cancel();
                             }
        
                         });
                         builder.setCancelable(false);
                         builder.create();
                         builder.show();
                         return true;
                     }
            
          };
       // 设置setWebChromeClient对象
          mWebView.setWebChromeClient(wvcc);
      
      
      
    }
   
    final class Action { 
       
        Action() { 
        } 
        
        public void clickOnAndroid_register() { 
           mHandler.post(new Runnable() { 
                public void run() { 
                   // mWebView.loadUrl("javascript:wave()");           
                    Toast.makeText(getBaseContext(), "欢迎进入注册！", Toast.LENGTH_SHORT).show();
                    //Intent intent = new Intent(MainActivity.this,Register.class);
                    Intent intent = new Intent(Register_protocolActivity.this,Register_IDcard.class);
                    Register_protocolActivity.this.startActivity(intent);
                      //设置切换动画，从右边进入，左边退出
                    overridePendingTransition(R.xml.in_from_right, R.xml.out_to_left);
                   
                } 
            }); 
        }  
       
       
        public void clickOnAndroid_quit() { 
            mHandler.post(new Runnable() { 
                 public void run() { 
                     finish();
                 } 
             }); 
         }
    } 

     //禁止回退
    public void onBackPressed() {
               // TODO Auto-generated method stub
               return;
               //super.onBackPressed();
    }
   
    @Override
    protected void onStop() {
        super.onStop();
        System.out.println("onStop!!");
        finish();
        // The activity is no longer visible (it is now "stopped")
    }

}