android javascript 调用activity

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WebView 里有一个 addJavascriptInterface (Object obj, String interfaceName)方法，object为一个实例对象，你想用javascript调用的函数写在这代码如下：

package com.webview;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.util.Log;import android.webkit.JsResult;import android.webkit.WebChromeClient;import android.webkit.WebSettings;import android.webkit.WebView;import android.widget.Toast;public class MainActivity extends Activity {    private static final String LOG_TAG = "WebViewDemo";    private WebView mWebView;    private Handler mHandler = new Handler();    @Override    public void onCreate(Bundle icicle) {        super.onCreate(icicle);        setContentView(R.layout.main);        mWebView = (WebView) findViewById(R.id.webview);        WebSettings webSettings = mWebView.getSettings();        webSettings.setSavePassword(false);        webSettings.setSaveFormData(false);        webSettings.setJavaScriptEnabled(true);        webSettings.setSupportZoom(false);        mWebView.addJavascriptInterface(new DemoJavaScriptInterface(), "demo");        mWebView.loadUrl("http://192.168.1.201:8080/java.html");    }    final class DemoJavaScriptInterface {        DemoJavaScriptInterface() {        }        /**         * This is not called on the UI thread. Post a runnable to invoke         * loadUrl on the UI thread.         */        public void clickOnAndroid() {            mHandler.post(new Runnable() {                public void run() {                   // mWebView.loadUrl("javascript:wave()");                Toast.makeText(getBaseContext(), "123", Toast.LENGTH_SHORT).show();                }            });        }    }    /**     * Provides a hook for calling "alert" from javascript. Useful for     * debugging your javascript.     */    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;        }            }}

在html里调用写法如下：

 <a onClick="window.demo.clickOnAndroid()">click me</a>

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