Android原生控件 -- WebView

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(keyCode == KeyEvent.KEYCODE_BACK && webView.canGoBack()){
            webView.goBack();
            return true;　　//返回true表示当前事件已被处理，返回false则当前事件还将会继续传递
        }
        return super.onKeyDown(keyCode, event);
    }

    @Override
    public void onBackPressed() {
        if(webView.canGoBack()){
            webView.goBack();
        }
        super.onBackPressed();
    }

public class MyWebViewClient extends WebViewClient{

    /**
     * 当页面跳转，就会调用该方法
     * @param view
     * @param request
     * @return
     */
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
        //我们不希望调用本地浏览器去打开连接，我们希望能够在当前WebView中继续加载
        view.loadUrl(request.getUrl().toString());
        return true;
    }

    /**
     * 页面加载时执行
     * @param view
     * @param url
     * @param favicon
     */
    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
        super.onPageStarted(view, url, favicon);
    }

    /**
     * 页面加载完成后执行
     * @param view
     * @param url
     */
    @Override
    public void onPageFinished(WebView view, String url) {
        super.onPageFinished(view, url);
    }
}

        webView.setWebViewClient(new MyWebViewClient());

public class MyWebChromeClient extends WebChromeClient{

    /**
     * 获取网页加载进度，可以实现进度条功能
     * @param view
     * @param newProgress
     */
    @Override
    public void onProgressChanged(WebView view, int newProgress) {
        super.onProgressChanged(view, newProgress);
    }

    /**
     * 设置网页的Title
     * @param view
     * @param title
     */
    @Override
    public void onReceivedTitle(WebView view, String title) {
        super.onReceivedTitle(view, title);
        setTitle(title);
    }
}

webView.loadUrl("javascript:alert(‘hello‘)");

webView.evaluateJavascript("javascript:alert(‘hello‘)",null);

webView.addJavascriptInterface();