android中WebView和javascript实现数据交互实例

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);   
        wView = (WebView)findViewById(R.id.wv1);  
          
       WebSettings wSet = wView.getSettings();  
        wSet.setJavaScriptEnabled(true); 

        ProxyBridge pBridge = new ProxyBridge();  
        wView.addJavascriptInterface(pBridge, "AliansBridge");  
        
        wView.loadUrl("file:///android_asset/index.html");  
          
    }  
 
 private class ProxyBridge {  
  public int one () {  
   return 1;  
  }  
 }  
 
}

<a onClick="window.demo.clickOnAndroid()">
 <div style="width:100px;  
            margin:0px auto;  
            padding:10px;  
            text-align:center;  
            border:2px solid #202020;" > 
                <img id="droid" src="android_normal.png" mce_src="android_normal.png"/><br> 
                Click me!  
        </div>
 </a>
<input type="submit" value="change to 1" onclick="document.getElementById('output').innerHTML

=AliansBridge.one()" />     
</body>
</html>