android编程之 js调用java的方法介绍

绝地灬酷狼 2024-03-29 15:05 170阅读 0赞

![87749204406ccbe6dbd362df630052aa.jpeg][]

转自：[微点阅读][Link 1] [https://www.weidianyuedu.com][Link 1]

[ajax][]调用java后台的方法,其实是通过url链接来访问。下面是小编为大家带来一篇ajax调用[java方法][java]，希望对大家有所帮助。

**　　android js调用java方法(一)**

\[java\] view plaincopypublic class JsInterface \{

/\*interface for javascript to invokes\*/

public interface wvClientClickListener \{

public void wvHasClickEnvent();

private wvClientClickListener wvEnventPro = null;

public void setWvClientClickListener(wvClientClickListener listener) \{

wvEnventPro = listener;

public void javaFunction() \{

if(wvEnventPro != null)

wvEnventPro.wvHasClickEnvent();

/\*Js2JavaActivity.JAVA\*/

/\*程序入口\*/

\[java\] view plaincopypublic class Js2JavaActivity extends Activity\{

private Button btn\_show,btn\_hide;

private [WebView][] wv;

private JsInterface JSInterface2 = new JsInterface();

@Override

protected void onCreate(Bundle savedInstanceState) \{

// TODO Auto-generated method [stub][]

super.onCreate(savedInstanceState);

setContentView(R.layout.js2java);

btn\_show = (Button)findViewById(R.id.btn\_java2js\_show);

btn\_hide = (Button)findViewById(R.id.btn\_java2js\_hide);

wv = (WebView)findViewById(R.id.wv\_js2java);

wv.getSettings().setJavaScriptEnabled(true);

wv.addJavascriptInterface(JSInterface2,"JSInterface2");

wv.setWebViewClient(new webviewClient());

wv.loadUrl("file:///android\_asset/index.html");

class webviewClient extends WebViewClient \{

@Override

public void onPageFinished(WebView view, String url) \{

// TODO Auto-generated method stub

super.onPageFinished(view, url);

btn\_show.setOnClickListener(new OnClickListener() \{

@Override

public void onClick(View v) \{

// TODO Auto-generated method stub

Toast.makeText(getBaseContext(), "You click show button", 1000).show();

wv.loadUrl(String.format("javascript：java2js(0)"));//这里是java端调用webview的JS

\});

btn\_hide.setOnClickListener(new OnClickListener() \{

@Override

public void onClick(View v) \{

// TODO Auto-generated method stub

Toast.makeText(getBaseContext(), "You click hide button", 1000).show();

wv.loadUrl(String.format("javascript：java2js(1)"));//这里是java端调用webview的JS

\});

JSInterface2.setWvClientClickListener(new webviewClick());//这里就是js调用java端的具体实现

class webviewClick implements wvClientClickListener \{

@Override

public void wvHasClickEnvent() \{

// TODO Auto-generated method stub

Toast.makeText(getBaseContext(), "link be on click", 1000).show();

**　　android js调用java方法(二)**

JavaJsDemo.java

package com.demo.android.JavaJsDemo;

import android.app.Activity;

import android.os.Bundle;

import android.webkit.WebView;

import java.util.ArrayList;

import java.util.List;

public class JavaJsDemo extends Activity \{

/\*\* Called when the activity is first created. \*/

private WebView web;

public List<String> list;

@Override

public void onCreate(Bundle savedInstanceState) \{

super.onCreate(savedInstanceState);

initData();

setContentView(R.layout.main);

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

//开启javascript设置

web.getSettings().setJavaScriptEnabled(true);

//把RIAExample的一个实例添加到js的全局对象window中

//这样就可以使用window.javatojs来调用它的方法

web.addJavascriptInterface(this, "javatojs");

//加载网页

web.loadUrl("file:///android\_asset/index.html");

void initData()\{

list=new ArrayList<String>();

for(int i=0;i<5;i++)\{

list.add("我是List中的第"+(i+1)+"行");

/\*\*

\* 该方法将在js脚本中，通过window.javatojs.....()进行调用

\* @return

\*/

public Object getObject(int index)\{

return list.get(index);

public int getSize()\{

return list.size();

public void Callfunction()\{

web.loadUrl("javascript： GetList()");

index.html

DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "

<html>

<head>

<title>demotitle>

function GetList()\{

var i=window.javatojs.getSize();

for(var n=0;n<i;n++)\{

var jsdata= window.javatojs.getObject(n);//拿到activity里面的属性javadata

var datalistdiv = document.getElementById("datalist"); //得到页面的div

pnode = document.createElement("p");//创建一个p标签，再建个textnode

tnode = document.createTextNode(jsdata);

pnode.appendChild(tnode);//p中加入数据

datalistdiv.appendChild(pnode);//div中键入新的p

script>

head>

<body οnlοad="javascript：window.javatojs.Callfunction()">//调用java方法

this is a demo

div>

body>

html>

[87749204406ccbe6dbd362df630052aa.jpeg]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/28/5387849ba77e4a82aa491c70853dff74.png
[Link 1]: https://www.weidianyuedu.com/
[ajax]: https://so.csdn.net/so/search?q=ajax&spm=1001.2101.3001.7020
[java]: https://so.csdn.net/so/search?q=java%E6%96%B9%E6%B3%95&spm=1001.2101.3001.7020
[WebView]: https://so.csdn.net/so/search?q=WebView&spm=1001.2101.3001.7020
[stub]: https://so.csdn.net/so/search?q=stub&spm=1001.2101.3001.7020