一、使用WebView

1.加入权限

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

2.创建一个webView

通过布局

  <WebView
            android:id="@+id/webkit"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" />

xml创建webview

或则直接在代码中创建

WebView webView=new WebView(this);

3.通过WebViewClient加载

mWebView.setWebViewClient(new WebViewClient(){       
                    public boolean shouldOverrideUrlLoading(WebView view, String url) {       
                        view.loadUrl(url);       
                        return true;       
                    }       
        });

4.辅助类WebSettings

通过browser.getSettings()获取WebSettings

a)可以集成对JS的脚本支持

 browser.getSettings().setJavaScriptEnabled(true);

b)对网页的缩放

browser.getSettings().setSupportZoom(true);//网页缩放

对于android4.0版本(4.1是否存在,有待研究)上述方式是不能够实现的

需要继续加入代码

browser.getSettings().setBuiltInZoomControls(true);
                browser.getSettings().setDefaultZoom(ZoomDensity.CLOSE);//默认缩放模式
                browser.setInitialScale(100);

5.加载本地资源assert目录下文件

browser.loadUrl("file:///android_asset/testChart.html");

6.对于返回的控制

重写WebViewClient的onKeyDown方法

public boolean onKeyDown(int keyCode, KeyEvent event) {       
           if ((keyCode == KeyEvent.KEYCODE_BACK) && browser.canGoBack()) {       
                browser.goBack();       
                       return true;       
            }    
            return super.onKeyDown(keyCode, event);       
        }

7.加入对JS的调用

<script language="javascript">
        /* This function is invoked by the activity */
        function wave() {
            alert("1");
           // document.getElementById("droid").src="android_waving.png";
            alert("2");
        }
    </script>
    <body>
        <!-- Calls into the javascript interface for the activity -->
        <a onClick="window.demo.clickOnAndroid()"><div style="80px;
            margin:0px auto;
            padding:10px;
            text-align:center;
            border:2px solid #202020;" >
                Click me!
        </div></a>
    </body>

   mWebView.addJavascriptInterface(new DemoJavaScriptInterface(), "demo");

  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()");
                    }
                });

            }
        }

ps:貌似android2.3版本会有VM aborting的问题。

如果需要调用alert的话,需要重写WebChromeClient

mWebView.setWebChromeClient(new MyWebChromeClient());

 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;*/
                return super.onJsAlert(view, url, message, result);
            }
        }

当然我们也可以捕获alert的内容,然后进行重写

mWebView.setWebChromeClient(new WebChromeClient() {
                @Override
                public boolean onJsAlert(WebView view, String url, String message, final JsResult result) {
                    AlertDialog.Builder b2 = new AlertDialog.Builder(MainActivity.this)
                            .setTitle("alert title").setMessage(message)
                            .setPositiveButton("ok",
                                    new AlertDialog.OnClickListener() {
                                        @Override
                                        public void onClick(DialogInterface dialog,
                                                int which) {
                                            result.confirm();
                                            // MyWebView.this.finish();
                                        }
                                    });

                    b2.setCancelable(false);
                    b2.create();
                    b2.show();
                    return true;
                }
            });

感谢vanekey兄的大力支持

更多移步这里:

https://code.google.com/p/android/issues/detail?id=12987

http://stackoverflow.com/questions/10104265/android-webview-javascript-doesnt-fire-the-call-back-function

http://www.linuxidc.com/Linux/2011-05/35782.htm