Android Activity 和 HTML 數據通信

Android activity 和 html一起開發難免有之間通訊的問題。今天簡單測試了一下：

代碼很簡單：

activity：

1. package com.lmn.webview.html;  
2.   
3. import android.app.Activity;  
4. import android.app.AlertDialog;  
5. import android.app.AlertDialog.Builder;  
6. import android.content.DialogInterface;  
7. import android.os.Bundle;  
8. import android.os.Handler;  
9. import android.os.Message;  
10. import android.view.Window;  
11. import android.webkit.JsResult;  
12. import android.webkit.WebChromeClient;  
13. import android.webkit.WebSettings;  
14. import android.webkit.WebStorage;  
15. import android.webkit.WebView;  
16. import android.widget.Toast;  
17.   
18. public class MainActivity extends Activity {  
19.     private WebView mWebView;  
20.   
21.     /** Called when the activity is first created. */  
22.     @Override  
23.     public void onCreate(Bundle savedInstanceState) {  
24.         super.onCreate(savedInstanceState);  
25.         setContentView(R.layout.main);  
26.         mWebView = (WebView) findViewById(R.id.webview);  
27.   
28.         WebSettings webSettings = mWebView.getSettings();  
29.         webSettings.setSavePassword(false);  
30.         webSettings.setSaveFormData(false);  
31.         webSettings.setJavaScriptEnabled(true);  
32.         webSettings.setSupportZoom(true);  
33.   
34.         // Horizontal水平方向，Vertical豎直方向   
35.         mWebView.setHorizontalScrollBarEnabled(false);  
36.         mWebView.setVerticalScrollBarEnabled(false);  
37.   
38.         mWebView.setWebChromeClient(new WebChromeClient() {  
39.             // 處理javascript中的alert   
40.             public boolean onJsAlert(WebView view, String url, String message,  
41.                     final JsResult result) {  
42.                 // 構建一個Builder來顯示網頁中的對話框   
43.                 Builder builder = new Builder(MainActivity.this);  
44.                 builder.setTitle("Alert");  
45.                 builder.setMessage(message);  
46.                 builder.setPositiveButton(android.R.string.ok,  
47.                         new AlertDialog.OnClickListener() {  
48.                             public void onClick(DialogInterface dialog,  
49.                                     int which) {  
50.                                 // 點擊確定按鈕之後,繼續執行網頁中的操作   
51.                                 result.confirm();  
52.                             }  
53.                         });  
54.                 builder.setCancelable(false);  
55.                 builder.create();  
56.                 builder.show();  
57.                 return true;  
58.             };  
59.   
60.             // 處理javascript中的confirm   
61.             public boolean onJsConfirm(WebView view, String url,  
62.                     String message, final JsResult result) {  
63.                 Builder builder = new Builder(MainActivity.this);  
64.                 builder.setTitle("confirm");  
65.                 builder.setMessage(message);  
66.                 builder.setPositiveButton(android.R.string.ok,  
67.                         new AlertDialog.OnClickListener() {  
68.                             public void onClick(DialogInterface dialog,  
69.                                     int which) {  
70.                                 result.confirm();  
71.                             }  
72.                         });  
73.                 builder.setNegativeButton(android.R.string.cancel,  
74.                         new DialogInterface.OnClickListener() {  
75.                             public void onClick(DialogInterface dialog,  
76.                                     int which) {  
77.                                 result.cancel();  
78.                             }  
79.                         });  
80.                 builder.setCancelable(false);  
81.                 builder.create();  
82.                 builder.show();  
83.                 return true;  
84.             };  
85.   
86.             // 設置網頁加載的進度條   
87.             public void onProgressChanged(WebView view, int newProgress) {  
88.                 MainActivity.this.getWindow().setFeatureInt(  
89.                         Window.FEATURE_PROGRESS, newProgress * 100);  
90.                 super.onProgressChanged(view, newProgress);  
91.             }  
92.   
93.             // 設置應用程序的標題title   
94.             public void onReceivedTitle(WebView view, String title) {  
95.                 MainActivity.this.setTitle(title);  
96.                 super.onReceivedTitle(view, title);  
97.             }  
98.   
99.             public void onReachedMaxAppCacheSize(long spaceNeeded,  
100.                     long totalUsedQuota, WebStorage.QuotaUpdater quotaUpdater) {  
101.                 quotaUpdater.updateQuota(spaceNeeded * 2);  
102.             }  
103.         });  
104.   
105.           
106.         mWebView.addJavascriptInterface(new JavaScriptInterface(), "demo");  
107.         mWebView.loadUrl("file:///android_asset/demo.html");  
108.     }  
109.   
110.     final class JavaScriptInterface {  
111.         JavaScriptInterface() {  
112.         }  
113.   
114.         public int mydata() {  
115.             return 10;  
116.         }  
117.   
118.         public void DataFromHtml(String resHtml) {  
119.             Message m = new Message();  
120.             m.obj = resHtml;  
121.             h.sendMessage(m);  
122.         }  
123.     }  
124.   
125.     Handler h = new Handler() {  
126.         public void handleMessage(Message msg) {  
127.             Toast.makeText(MainActivity.this, msg.obj + "", Toast.LENGTH_LONG)  
128.                     .show();  
129.         }  
130.     };  
131. }  

HTML:

1. <!DOCTYPE html >  
2. <html>  
3.     <head>  
4.         <meta http-equiv="Content-Type" content="text/html; charset=GBK">  
5.         <meta name="viewport" content="width=device-width, initial-scale=1.0, initial-scale = 1.0 ,user-scalable=no , maximum-scale = 1.0 ">  
6.         <link rel="stylesheet" href="css/jquery.mobile.min.css" />  
7.         <script  src="js/jquery-1.7.1.min.js"></script>  
8.         <title>Insert title here</title>  
9.         <script type="text/javascript">  
10.             $(function() {  
11.                 $("#btn_getHtml").click(function(event) {  
12.                     demo.DataFromHtml("From Html");  
13.                 });  
14.   
15.                 $("#btn_getActivity").click(function(event) {  
16.                     alert(demo.mydata());  
17.                 });  
18.             });  
19.         </script>  
20.         <script src="js/jquery.mobile.min.js"></script>  
21.     </head>  
22.     <body>  
23.         <div data-role="page" id="home">  
24.             <div data-role="content">  
25.                 -----------這是一個html頁面----------  
26.                 <button id="btn_getActivity">  
27.                     獲取Activity中的數據  
28.                 </button>  
29.                 <button id="btn_getHtml">  
30.                     獲取Html中的數據  
31.                 </button>  
32.             </div>  
33.         </div>  
34.     </body>  
35. </html>