Android WebView中使用Java调用JavaScript方法并获取返回值

package com.financial.activity;

import java.util.Iterator;

import org.json.JSONObject;

import com.financial.R;

import com.financial.bll.AccountBLL;

import com.financial.fund.widget.ScreenManager;

import com.kit.CallBack;

import com.loopj.android.http.RequestParams;

import android.R.string;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.view.View;

import android.view.View.OnClickListener;

import android.webkit.WebChromeClient;

import android.webkit.WebView;

import android.webkit.WebViewClient;

import android.widget.ImageView;

import android.widget.Toast;

public class WeBActivity extends Activity implements OnClickListener{

private WebView web;

/** @Fields retBtn : 返回按钮*/

private ImageView retBtn;

private AccountBLL bll;

private Handler handler;

private String path="";

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.web_activity);

ScreenManager.getInstance().addActivity(this);

bll=new AccountBLL(this);

web=(WebView) findViewById(R.id.web);

// web.loadUrl("www.aviationmaterial.com");

retBtn=(ImageView) findViewById(R.id.backbtn);

retBtn.setOnClickListener(this);

getRutl();

}

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(v==retBtn){

WeBActivity.this.finish();

}

}

public void getRutl(){

web.setWebChromeClient(new WebChromeClient());

web.setWebViewClient(new WebViewClient());

web.getSettings().setJavaScriptEnabled(true);

String s="https://hao.360.cn/?src=bm";//WebView访问的网址

web.loadUrl(s);

web.addJavascriptInterface(new Handler(), "handler");

web.setWebViewClient(new WebViewClient() {

@Override

public void onPageFinished(WebView view, String url) {

//ChinaPNRCmdId 获取值得参数

view.loadUrl("javascript:window.handler.show(document.getElementById('ChinaPNRCmdId').value);");

super.onPageFinished(view, url);

}

});

}

class Handler {

public void show(String data) {

//获取到的值

Toast.makeText(WeBActivity.this, data, 0).show();

}

}