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

<WebView
android:id="@+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent" />

Map<String,String> map=new HashMap<String,String>();map.put("User-Agent","Android");
webView.loadUrl("www.xxx.com/index.html",map);

String data = " Html 数据";
webView.loadData(data, "text/html", "utf-8");

String data = " Html 数据";
webView.loadDataWithBaseURL(null,data, "text/html", "utf-8",null);

WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);//设置支持javascript
webView.addJavascriptInterface(new JavaScriptInterface(), "xueleapp"); JavaScriptInterface 接口定义 
public class JavaScriptInterface {
@android.webkit.JavascriptInterface
public void doTrainFinish() {
finish();
}
}

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

webView.setWebChromeClient(new WebChromeClient() {
@Override
public void onProgressChanged(WebView view, int newProgress) {
if (newProgress == 100) {
//网页加载完成
} else {
//网页加载中
}
}
});

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (webView.canGoBack()) {
webView.goBack();//返回上一浏览页面
return true;
} else {
finish();//关闭Activity
}
}
return super.onKeyDown(keyCode, event);
}

WebSettings webSettings = webView.getSettings();
webSettings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);

WebSettings webSettings = webView.getSettings();
webSettings.setUseWideViewPort(true);
webSettings.setLoadWithOverviewMode(true);

WebSettings webSettings = webView.getSettings();
webSettings.setSupportZoom(true); //支持缩放
webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN); //支持内容重新布局
webSettings.supportMultipleWindows(); //多窗口
webSettings.setAllowFileAccess(true); //设置可以访问文件
webSettings.setNeedInitialFocus(true); //当webview调用requestFocus时为webview设置节点
webSettings.setBuiltInZoomControls(true); //设置支持缩放
webSettings.setJavaScriptCanOpenWindowsAutomatically(true); //支持通过JS打开新窗口
webSettings.setLoadsImagesAutomatically(true); //支持自动加载图片

webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
invalidate();
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}