Android-----js and Android Intermodulation

http://code.google.com/p/apps-for-android/source/browse/trunk/Samples/WebViewDemo/

I modified it, and added a simple comment, this example is not only the operation of JS, it is also a simple introduction to the Android browser,
These I will explain in the note one by one.

The JavaScript pop-up box has the following three kinds:

1. alert ();
2. Window.confirm ("is you srue?");
3. Window.prompt ("Please input some word";,"This is Text");

Three kinds of dialog were captured in Webchromeclient, but unfortunately, there is no callback function to use,
Or, you can't get the result of a user clicking "OK" or "Cancel".
Personally, these methods are set up to be used to test some applications that involve HTML operations.
The following methods are also available in webchromeclient:

1. Onprogresschanged (WebView view, int newprogress);
2. Onreceivedicon (WebView view, Bitmap icon);
3. Onreceivedtitle (WebView view, String title);
4. Onrequestfocus (WebView view);
5. Onclosewindow (WebView window);
6. Onprogresschanged (WebView view, int newprogress)

The use of these methods will be described in a later blog post.
Please look at the focus of today's explanation

2. Public class Webviewdemo extends Activity {
6. private static final String Log_tag = "Webviewdemo";
8. private WebView Mwebview;
10. private TextView Mreusulttext;
12. private Handler Mhandler = new Handler ();
16. @Override
18. public void OnCreate (Bundle icicle) {
22. super.oncreate (icicle);
24. Setcontentview (R.layout.main);
26. //Get browser Components
28. //webview is a simple browser.
30. //android Browser source code exists in the Linux\android\package\apps\browser
32. all operations are carried out around the WebView .
34. Mwebview = (WebView) Findviewbyid (R.id.webview);
36. Mreusulttext = (TextView) Findviewbyid (R.id.resulttext);
38. //websettings Almost all of the browser settings are in this class
40. WebSettings websettings = Mwebview.getsettings ();
42. Websettings.setsavepassword (false);
44. Websettings.setsaveformdata (false);
46. Websettings.setjavascriptenabled (true);
48. Websettings.setsupportzoom (false);
50. Mwebview.setwebchromeclient (new Mywebchromeclient ());
52. /* 
54. * Demojavascriptinterface class provides interface for JS calling Android server side
56. * Android as the client interface of the Demojavascriptinterface class is called by JS
58. * The specific method of invocation is defined in Demojavascriptinterface:
60. * For example, clickonandroid in this instance
62. */
64. Mwebview.addjavascriptinterface (new Demojavascriptinterface (),"Androd");
66. Mwebview.loadurl ("file:///android_asset/page.html");
68. }
72. final class Demojavascriptinterface {
74. Demojavascriptinterface () {}
78. /** 
80. * This method is called by the browser side
82. */
84. public void Clickonandroid () {
86. Mhandler.post (new Runnable () {
88. public Void Run () {
90. //Call the Onjsandroid method in JS
92. Mwebview.loadurl ("javascript:onjsandroid ()");
94. }
96. });
98. }
100. }
104. /** 
106. * Inherit Webchromeclient class
108. * Processing of JS popup time
110. *
112. */
114. final class Mywebchromeclient extends Webchromeclient {
118. /** 
120. * Handle Alert Popup box
122. */
124. @Override
126. Public Boolean onjsalert (WebView view,string URL,
128. String Message,jsresult result) {
130. LOG.D (Log_tag,"Onjsalert:" +message ");
132. Mreusulttext.settext ("Alert:" +message);
134. //Simple package for alert
136. New Alertdialog.builder (Webviewdemo.   This).
138. Settitle ("Alert"). Setmessage (Message). Setpositivebutton ("OK",
140. New Dialoginterface.onclicklistener () {
142. @Override
144. public void OnClick (Dialoginterface arg0, int arg1) {
146. //todo
148. }
150. }). Create (). Show ();
152. Result.confirm ();
154. return true;
156. }
160. /** 
162. * Processing Confirm popup Box
164. */
166. @Override
168. Public Boolean onjsconfirm (WebView view, string URL, String message,
170. Jsresult result) {
172. LOG.D (Log_tag, "onjsconfirm:" +message);
174. Mreusulttext.settext ("Confirm:" +message);
176. Result.confirm ();
178. return super.onjsconfirm (view, URL, message, result);
180. }
184. /** 
186. * Processing Prompt popup box
188. */
190. @Override
192. Public Boolean onjsprompt (WebView view, string URL, String message,
194. String DefaultValue, jspromptresult result) {
196. LOG.D (Log_tag,"onjsprompt:" +message);
198. Mreusulttext.settext ("Prompt input is:" +message);
200. Result.confirm ();
202. return super.onjsprompt (view, URL, message, message, result);
204. }
206. }
208. }

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Android-----js and Android Intermodulation