標籤：android與js互動 javascrip 注入js
一、思路分析
經過測試發現，JS中的點擊事件只能寫一個，如果寫了多個，也只會響應第一個，如果寫的方法是android端的方法，在web端運行時，後台會報未定義這個方法的錯誤，前台點擊無響應。
所以，如果想要web中某個按鈕在web端響應的是JS中的方法，而在android端響應的是android端的方法，就需要自己在頁面載入完畢時，手動注入JS函數監聽。
二、代碼
demo3.html
該段代碼是放在assets檔案夾下的
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" "http://www.wapforum.org/DTD/xhtml-mobile10.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" /> <title>veikr的部落格 </title> <meta name="generator" content="WordPress 3.5.1" /> <meta name="wap-version" content="1.10 (2008.8.3)" /> <link rel="alternate" type="application/rss+xml" title="veikr的部落格 RSS Feed" href="http://veikr.com/feed" /> <link rel="pingback" href="http://veikr.com/xmlrpc.php" /> <link rel="shortcut icon" href="http://veikr.com/wp-content/themes/twentyten/favicon.ico" type="image/x-icon" /> <link rel="stylesheet" href="wap.css" type="text/css" media="all" /> </head><body><input type="button" id="testbtn" value="我是按鈕1"onClick="window.imagelistner.openImage()" onClick="test2()"/><input onClick="test()" type="button" id="testbtn2" value="我是按鈕2"/><a onClick="test3()"><div style="width:80px;margin:0px auto;padding:10px;text-align:center;border:2px solid #202020;" ><img id="droid" src="http://www.baidu.com/img/bd_logo1.png" /><br>Click me!</div></a></body><script language="javascript">function test(){ alert("點擊了按鈕2"); }function test2(){ alert("點擊了按鈕1"); }function test3(){ alert("點擊了圖片"); }function wave() { alert("點擊了andorid中的按鈕");}</script> </html>
main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <WebView android:id="@+id/webview" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="9" /></LinearLayout>
package wst.webview;import android.annotation.SuppressLint;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.graphics.Bitmap;import android.os.Bundle;import android.webkit.WebView;import android.webkit.WebViewClient;@SuppressLint("SetJavaScriptEnabled")public class MainActivity extends Activity {private WebView contentWebView = null;@SuppressLint("SetJavaScriptEnabled")@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);contentWebView = (WebView) findViewById(R.id.webview);// 啟用javascriptcontentWebView.getSettings().setJavaScriptEnabled(true);// 載入本地html檔案，內容如上contentWebView.loadUrl("file:///android_asset/demo3.html");// 添加js互動介面類，並起別名 imagelistnercontentWebView.addJavascriptInterface(new JavascriptInterface(this), "imagelistner");contentWebView.setWebViewClient(new MyWebViewClient());}// 注入js函數監聽<span style="white-space:pre"></span>//下面提供了三種js注入函數，可以根據需求選擇相應的JS函數private void addImageClickListner() {// 這段js函數的功能就是，遍曆所有的img幾點，並添加onclick函數，在還是執行的時候調用本地介面傳遞url過去contentWebView.loadUrl("javascript:(function(){" +"var objs = document.getElementsByTagName(\"img\"); " + "for(var i=0;i<objs.length;i++) " + "{"+ " objs[i].onclick=function() " + " { " + " window.imagelistner.openImage(this.src); " + " } " + "}" + "})()");//這段Js函數的功能是捕捉JS中的代碼，對其中的id為testbtn的按鈕，重新添加點擊事件contentWebView.loadUrl("javascript:(function(){" +"var obj = document.getElementById(\"testbtn\");" +"obj.onclick=function() " + " { " + " window.imagelistner.clickButton(); " + " } " + "})()");//這段js函數的功能是遍曆所有的input幾點，添加點擊事件contentWebView.loadUrl("javascript:(function(){" +"var objs = document.getElementsByTagName(\"input\"); " + "for(var i=0;i<objs.length;i++) " + "{"+ " objs[i].onclick=function() " + " { " + " window.imagelistner.clickButton(); " + " } " + "}" + "})()");}// js通訊介面public class JavascriptInterface {private Context context;public JavascriptInterface(Context context) {this.context = context;}public void openImage(String img) {System.out.println(img);//Intent intent = new Intent();intent.putExtra("image", img);intent.setClass(context, ShowWebImageActivity.class);context.startActivity(intent);System.out.println(img);}public void clickButton(){Intent intent = new Intent(context,SecondActivity.class);startActivity(intent);}}// 監聽private class MyWebViewClient extends WebViewClient {@Overridepublic boolean shouldOverrideUrlLoading(WebView view, String url) {return super.shouldOverrideUrlLoading(view, url);}@Overridepublic void onPageFinished(WebView view, String url) {view.getSettings().setJavaScriptEnabled(true);super.onPageFinished(view, url);// html載入完成之後，添加監聽圖片的點擊js函數addImageClickListner();}@Overridepublic void onPageStarted(WebView view, String url, Bitmap favicon) {view.getSettings().setJavaScriptEnabled(true);super.onPageStarted(view, url, favicon);}@Overridepublic void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {super.onReceivedError(view, errorCode, description, failingUrl);}}}
點擊圖片，響應android端注入的JS函數監聽；但是在web端響應的還是原來的監聽。按鈕也同樣如此。
Android與JavaScrip進行互動（二）
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
