webview跟javascript交互
android使用html5作布局文件http://www.cnblogs.com/andgoo/archive/2011/10/11/2207936.html
Android中webview跟JAVASCRIPT中的交互http://www.oschina.net/question/4873_27156
android软件开发之webView.addJavascriptInterface循环渐进【一】:http://www.sollyu.com/android-software-development-webview-addjavascriptinterface-cycle-of-gradual-one
android软件开发之webView.addJavascriptInterface循环渐进【二】:http://www.sollyu.com/586
WebView注入Java对象注意事项
在android4.2以前,注入步骤如下:
webview.getSetting().setJavaScriptEnable(true); class JsObject { public String toString() { return "injectedObject"; } } webView.addJavascriptInterface(new JsObject(), "injectedObject");
Android4.2及以后,注入步骤如下:
webview.getSetting().setJavaScriptEnable(true); class JsObject { @JavascriptInterface public String toString() { return "injectedObject"; } } webView.addJavascriptInterface(new JsObject(), "injectedObject");
发现区别没?4.2之前向webview注入的对象所暴露的接口toString没有注释语句@JavascriptInterface,而4.2及以后的则多了注释语句@JavascriptInterface
经过查官方文档所知,因为这个接口允许JavaScript控制宿主应用程序,这是个很强大的特性,但同时,在4.2的版本前存在重大安全隐患,因为JavaScript可以使用反射访问注入webview的java对象的publicfields,在一个包含不信任内容的WebView中使用这个方法,会允许攻击者去篡改宿主应用程序,使用宿主应用程序的权限执行java代码。因此4.2以后,任何为JS暴露的接口,都需要加@JavascriptInterface,注释,这样,这个Java对象的fields将不允许被JS访问。
HTML调用android的方法:
1.配置android支持js
WebSettingswebSettings=webview.getSettings();
webSettings.setJavaScriptEnabled(true);//启用javascript支持
2.定义和暴露接口给js
webview.addJavascriptInterface(new PersonPlugin(), "Person");
private final class PersonPlugin { @JavascriptInterface public void getPersonList() { ...... } }
3.js访问
Person.getPersonList();
Android访问HTML方法
1.在html定义方法
function show(){ document.write("This is a test message."); }
2.在android中访问js方法:
webview.loadUrl("javascript:show('" + JSONStr + "')");
例子:
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package com.example.html5Java; import android.app.Activity; import android.content.Intent; import android.graphics.Bitmap; import android.net.Uri; import android.os.Bundle; import android.util.Log; import android.webkit.*; import com.example.html5Java.app.Person; import com.example.html5Java.app.PersonService; import org.json.JSONArray; import org.json.JSONObject; import java.util.List; public class MyActivity extends Activity { private static final String LOG_TAG = "WebViewDemo"; private PersonService service; private WebView webview; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); service = new PersonService(); webview = (WebView) this.findViewById(R.id.webView);//android内置浏览器对象 WebSettings webSettings = webview.getSettings(); webSettings.setJavaScriptEnabled(true);//启用javascript支持 webSettings.setSavePassword(false); webSettings.setSaveFormData(false); webSettings.setSupportZoom(false); webview.setWebChromeClient(new MyWebChromeClient()); //添加一个js交互接口,方便html布局文件中的javascript代码能与后台java代码直接交互访问 webview.addJavascriptInterface(new PersonPlugin(), "Person");//new类名,交互访问时使用的别名 // <body onload="javascript:Person.getPersonList()"> //其实可以把这个html布局文件放在公网中,这样方便随时更新维护 例如 webview.loadUrl("www.xxxx.com/index.html"); webview.loadUrl("file:///android_asset/index.html");//加载本地的html布局文件 webview.setWebViewClient(new WebViewClient() { //网页加载开始时调用,显示加载提示旋转进度条 @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { // TODO Auto-generated method stub super.onPageStarted(view, url, favicon); } //网页加载完成时调用,隐藏加载提示旋转进度条 @Override public void onPageFinished(WebView view, String url) { // TODO Auto-generated method stub super.onPageFinished(view, url); } //网页加载失败时调用,隐藏加载提示旋转进度条 @Override public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) { super.onReceivedError(view, errorCode, description, failingUrl); } }); } //定义一个内部类,从java后台(可能是从网络,文件或者sqllite数据库) 获取List集合数据,并转换成json字符串,调用前台js代码 private final class PersonPlugin { @JavascriptInterface public void getPersonList() { List<Person> list = service.getPersonList();//获得List数据集合 //将List泛型集合的数据转换为JSON数据格式 try { JSONArray arr = new JSONArray(); for (Person person : list) { JSONObject json = new JSONObject(); json.put("id", person.getId()); json.put("name", person.getName()); json.put("mobile", person.getMobile()); arr.put(json); } String JSONStr = arr.toString();//转换成json字符串 webview.loadUrl("javascript:show('" + JSONStr + "')");//执行html布局文件中的javascript函数代码-- Log.i("MainActivity", JSONStr); } catch (Exception e) { // TODO: handle exception } } @JavascriptInterface //打电话的方法 public void call(String mobile) { Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + mobile)); startActivity(intent); } } final class MyWebChromeClient extends WebChromeClient { @Override public boolean onJsAlert(WebView view, String url, String message, JsResult result) { Log.d(LOG_TAG, message); result.confirm(); return true; } } }
package com.dazhuo.domain; public class Person { private Integer id; public Integer getId() { return id; } public Person(Integer id, String name, String mobile) { super(); this.id = id; this.name = name; this.mobile = mobile; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getMobile() { return mobile; } public void setMobile(String mobile) { this.mobile = mobile; } private String name; private String mobile; }
package com.dazhuo.service; import java.util.ArrayList; import java.util.List; import com.dazhuo.domain.Person; public class PersonService { public List<Person> getPersonList() { List<Person> list =new ArrayList<Person>(); list.add(new Person(32, "aa", "13675574545")); list.add(new Person(32, "bb", "13698874545")); list.add(new Person(32, "cc", "13644464545")); list.add(new Person(32, "dd", "13908978877")); list.add(new Person(32, "ee", "15908989898")); return list; } }
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <script type="text/javascript"> function show(jsondata){ var jsonobjs = eval(jsondata); var table = document.getElementById("personTable"); for(var y=0; y<jsonobjs.length; y++){ var tr = table.insertRow(table.rows.length); //添加一行 //添加三列 var td1 = tr.insertCell(0); var td2 = tr.insertCell(1); td2.align = "center"; var td3 = tr.insertCell(2); td3.align = "center"; //设置列内容和属性 td1.innerHTML = jsonobjs[y].id; td2.innerHTML = jsonobjs[y].name; td3.innerHTML = "<a href='javascript:Person.call(\""+ jsonobjs[y].mobile+ "\")'>"+ jsonobjs[y].mobile+ "</a>"; } } function test(){ alert("======================>Alert测试"); document.write("执行测试"); } </script> </head> <!-- js代码通过webView调用其插件中的java代码 --> <body onload="Person.getPersonList();"> <table border="0" width="100%" id="personTable" cellspacing="0"> <tr> <td width="20%">编号</td><td width="40%" align="center">姓名</td><td align="center">电话</td> </tr> </table> <a href="javascript:window.location.reload();">刷新本页面</a> <a href="javascript:test()">测试函数</a> </body> /</html>
转自:http://blog.csdn.net/dinglang_2009/article/details/6862627