android控件之webview和js与java交互

首先添加权限：<uses-permission android:name="android.permission.INTERNET"/>

布局文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity" >

    <TextView

        android:id="@+id/preNums"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:gravity="center"

        android:padding="10dp"

        android:text="当前进度：0%" />

    <WebView

        android:id="@+id/webView1"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_below="@+id/preNums" />

</RelativeLayout>

html5页面代码：

<!DOCTYPE html>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0;"/>

<meta name="format-detection" content="telephone=no"/>

<title>手机网页</title>

<style>

*{ padding:0px; margin:0px;}

div{ margin:0px auto;}

.mytop{ height:60px; background-color:#000000; text-align:center;}

.myfont{ color:#FFFFFF; font-size:16px; font-weight:bold; line-height:60px;}

.mytest{ background-color:#FF0000; margin:20px auto; width:100px; height:100px; border-radius:50px;  box-shadow:8px 8px 8px #0000FF; line-height:100px; text-align:center;}

</style>

<script>

function ChangeDiv(){

	//document.getElementById("insertDiv").innerHTML='哈哈';

	//调用java代码

	MyAndroid.MyFun("哈哈可以调用");

}

// 被java调用的方法

function ToJavaFun(outstr){

	document.getElementById("insertDiv").innerHTML=outstr;

}

</script>

</head>

<body>

<div class="mytop">

<a href="http://www.baidu.com" class="myfont">前往百度</a>

</div>

<div class="mytest" id="insertDiv">

</div>

<div style="text-align:center; padding:10px;">

	<input name="" type="button" value="执行" onClick="ChangeDiv('你好');" >

</div>

</body>

</html>

java代码：

package com.example.mywebview;

import android.os.Bundle;

import android.os.Handler;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.view.Menu;

import android.webkit.JavascriptInterface;

import android.webkit.WebChromeClient;

import android.webkit.WebView;

import android.webkit.WebViewClient;

import android.widget.TextView;

import android.widget.Toast;

/*

 * author：future

 *

 * sijienet.com

 *

 * */

@SuppressLint({ "JavascriptInterface", "SetJavaScriptEnabled" })

public class MainActivity extends Activity {

	WebView webView;

	TextView textView;

	Handler handler;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		handler = new Handler();

		webView = (WebView) findViewById(R.id.webView1);

		textView = (TextView) findViewById(R.id.preNums);

		// 开启js接口模式

		webView.getSettings().setJavaScriptEnabled(true);

		webView.addJavascriptInterface(new MyAndroidFun(), "MyAndroid");

		webView.setWebViewClient(new MyWebClient());

		webView.setWebChromeClient(new MyChrome());// 配置默认参数

		webView.loadUrl("file:///android_asset/index.html");

	}

	class MyChrome extends WebChromeClient {

		@Override

		public void onProgressChanged(WebView view, int newProgress) {

			// 进度更新

			textView.setText("当前进度：" + newProgress + "%");

			super.onProgressChanged(view, newProgress);

		}

	}

	class MyAndroidFun {// 调用类作用于

		@JavascriptInterface

		public void MyFun(String msg) {

			Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_SHORT)

					.show();

			handler.post(new Runnable() {

				@Override

				public void run() {

					// TODO Auto-generated method stub

					String outString = "我的内容";

					webView.loadUrl("javascript:ToJavaFun('" + outString + "')");

				}

			});

		}

	}

	@Override

	public void onBackPressed() {

		// TODO Auto-generated method stub

		if (webView.canGoBack()) {

			webView.goBack();

		}

		// super.onBackPressed();

	}

	class MyWebClient extends WebViewClient {

		@Override

		public boolean shouldOverrideUrlLoading(WebView view, String url) {

			// TODO Auto-generated method stub

			if (url != null && url.length() > 0) {

				if (url.indexOf("http://") != -1

						|| url.indexOf("https://") != -1) {// 不存在

				} else {

					// 添加前缀

					url = "http://" + url;

				}

				view.loadUrl(url);

				return true;

			}

			return super.shouldOverrideUrlLoading(view, url);

		}

	}

}

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android控件之webview和js与java交互

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