在android里如何利用WebView实现和javascript通信

1、为确保有权限访问网页，在AndroidManifest.xml里面添加代码如下：

<uses-permission android:name="android.permission.INTERNET"/>

2、在res/layout/main.xml里添加

3、activity 里面添加

 1 package com.phoneplus;
 2 import android.app.Activity;
 3 import android.content.Intent;
 4 import android.os.Build;
 5 import android.os.Bundle;
 6 import android.util.DisplayMetrics;
 7 import android.util.Log;
 8 import android.webkit.JsResult;
 9 import android.webkit.WebChromeClient;
10 import android.webkit.WebSettings;
11 import android.webkit.WebView;
12 import android.widget.Toast;
13 
14 public class DemoActivity extends Activity {
15      WebView webView;
16      String  url = "http://10.254.58.32/demo/gradeplan/activitydetail.php?v=1";
17     private WebSettings settings;
18      
19     /** Called when the activity is first created. */
20     @Override
21     public void onCreate(Bundle savedInstanceState) {
22         super.onCreate(savedInstanceState);
23         setContentView(R.layout.main);
24        //测试WebView
25         webView = (WebView) findViewById(R.id.webview);
26         webView.getSettings().setSavePassword(false);
27         webView.getSettings().setJavaScriptEnabled(true);
28         webView.getSettings().setUseWideViewPort(true);  
29         webView.getSettings().setLoadWithOverviewMode(true);  
30         webView.getSettings().setBuiltInZoomControls(true);   
31         webView.getSettings().setSupportZoom(true);  
32         display(webView);
33         //显示网页
34         webHtml(url);
35         webView.setWebChromeClient(new MyWebChromeClient());
36      }
37     
38     class MyWebChromeClient extends WebChromeClient{
39         @Override
40         public boolean onJsAlert(WebView view, String url, String message, JsResult result){           
41     
42             Log.d("==message==",message);
43             Log.d("==url==",url);
44             Log.d("==JsResult==",result.toString());
45  
46             result.confirm();
47             return true;            
48         }
49         
50     }
51     
52     /**  直接网页显示   */   
53     private void webHtml(String url) {   
54         try {   
55             webView.loadUrl(url);   
56         } catch (Exception ex) {  
57             ex.printStackTrace();  
58         }   
59     }  
60      
61     /**
62      * 分辨率自适应
63      * @param webView
64      */
65     private void display(WebView webView){
66         DisplayMetrics dm = new DisplayMetrics();
67         getWindowManager().getDefaultDisplay().getMetrics(dm);
68         int width = (int) (dm.widthPixels * dm.density);
69 
70         if ( Build.VERSION.SDK_INT >= 14 && width >= 480 ) {
71             webView.setInitialScale(100);
72         }else if ( Build.VERSION.SDK_INT ==14 && width >= 320 ) {
73             webView.setInitialScale(67);
74         }else if ( Build.VERSION.SDK_INT == 14 && width < 320 ) {
75             webView.setInitialScale(50);
76         }else {
77             webView.setInitialScale(1);
78         }
79     }
80 }

4、HTML里面

 1  <script type="text/javascript">  
 2         
 3      function get_activity(str_flag){  
 4         <?php 
 5             //android
 6             if( $_GET['v'] == '1'){ 
 7                 echo 'alert(str_flag); ';
 8             }
 9             //ios
10             else {
11                 echo 'document.location = str_flag;';
12             }
13         ?>
14       }  
15 </script>

posted on 2013-01-06 16:49 lsl8966 阅读(348) 评论(0) 编辑收藏举报