Android WebView使用详解包括js互调

<WebView
        android:id="@+id/webView1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginTop="10dp" />

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

webview = (WebView) findViewById(R.id.webView1);
webview.loadUrl("http://www.baidu.com/");
//webview.reload();// reload page

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

webview.setWebChromeClient(new WebChromeClient(){
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                //get the newProgress and refresh progress bar
            }
        });

webview.setWebChromeClient(new WebChromeClient(){
            @Override
            public void onReceivedTitle(WebView view, String title) {
                titleview.setText(title);//a textview
            }
        });

public class HttpThread extends Thread {


    private String mUrl;

    public HttpThread(String mUrl) {
        this.mUrl = mUrl;
    }
    
    @Override
    public void run() {
        URL url;
        try {
            url = new URL(mUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setDoInput(true);
            conn.setDoOutput(true);
            InputStream in = conn.getInputStream();
            
            File downloadFile;
            File sdFile;
            FileOutputStream out = null;
            if(Environment.getExternalStorageState().equals(Environment.MEDIA_UNMOUNTED)){
                downloadFile = Environment.getExternalStorageDirectory();
                sdFile = new File(downloadFile, "test.file");
                out = new FileOutputStream(sdFile);
            }
            
            //buffer 4k
            byte[] buffer = new byte[1024 * 4];
            int len = 0;
            while((len = in.read(buffer)) != -1){
                if(out != null)
                    out.write(buffer, 0, len);
            }
            
            //close resource
            if(out != null)
                out.close();
            
            if(in != null){
                in.close();
            }
            
            
            
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
}

//创建DownloadListener (webkit包)
class MyDownloadListenter implements DownloadListener{

        @Override
        public void onDownloadStart(String url, String userAgent,
                String contentDisposition, String mimetype, long contentLength) {
            System.out.println("url ==== >" + url);
            new HttpThread(url).start();
        }
        
    }

//给webview加入监听
webview.setDownloadListener(new MyDownloadListenter());

class MyDownloadListenter implements DownloadListener{

        @Override
        public void onDownloadStart(String url, String userAgent,
                String contentDisposition, String mimetype, long contentLength) {
            System.out.println("url ==== >" + url);
            //new HttpThread(url).start();
            
            Uri uri = Uri.parse(url);
            Intent intent = new Intent(Intent.ACTION_VIEW, uri);
            startActivity(intent);
        }
        
    }

webview.setWebViewClient(new WebViewClient(){
       
            @Override
            public void onReceivedError(WebView view, int errorCode,
                    String description, String failingUrl) {
                switch(errorCode)
                {
                case HttpStatus.SC_NOT_FOUND:
                    view.loadUrl("file:///android_assets/error_handle.html");
                    break;
                }
            }
        });

public class HttpCookie extends Thread {

    private Handler mHandler;

    public HttpCookie(Handler mHandler) {
        this.mHandler = mHandler;
    }
    
    @Override
    public void run() {
        HttpClient client = new DefaultHttpClient();
        HttpPost post = new HttpPost("");//this place should add the login address
        
        List<NameValuePair> list = new ArrayList<NameValuePair>();
        list.add(new BasicNameValuePair("name", "jason"));
        list.add(new BasicNameValuePair("pwd", "123456"));
        
        try {
            post.setEntity(new UrlEncodedFormEntity(list));
            HttpResponse reponse = client.execute(post);
            if(reponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
                AbstractHttpClient absClient = (AbstractHttpClient) client;
                List<Cookie> cookies = absClient.getCookieStore().getCookies();
                
                for(Cookie cookie:cookies){
                    if(cookie != null){
                        //TODO
                        //this place would get the cookies
                    }
                }
            }
            
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
}

if(cookie != null){
    //TODO
    //this place would get the cookies
    Message msg = new Message();
    msg.obj = cookie;
    if(mHandler != null){
        mHandler.sendMessage(msg);
        return;
    }
}

    private Handler mHandler = new Handler(){
        public void handleMessage(android.os.Message msg) 
        {
            
            CookieSyncManager.createInstance(MainActivity.this);
            CookieManager cookieMgr = CookieManager.getInstance();
            cookieMgr.setAcceptCookie(true);
            cookieMgr.setCookie("", msg.obj.toString());// this place should add the login host address(not the login index address)
            CookieSyncManager.getInstance().sync();
            
            webview.loadUrl("");// login index address
        };
    };

mWebView.loadUrl("javascript:do()");

<html>
    <script language="javascript">
        /* This function is invoked by the webview*/
        function do() {
            alert("1");
        }
    </script>
    <body>
        <a onClick="window.demo.clickOnAndroid()"><div style="width:80px;
            margin:0px auto;
            padding:10px;
            text-align:center;
            border:2px solid #111111;" >
                <img id="droid" src="xx.png"/><br>
                Click me!
        </div></a>
    </body>
</html>

package com.test.webview;
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() {
                    //TODO
                }
            });

        }
    }

mWebview.setJavaScriptEnabled(true);

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

<body onload="javascript:demo.clickOnAndroid()">  
    ...
</body>

-keep public class com.test.webview.DemoJavaScriptInterface{
    public <methods>;
}

-keep public class com.test.webview.DemoJavaScriptInterface$InnerClass{
    public <methods>;
}

-keepattributes *Annotation*  
-keepattributes *JavascriptInterface*