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

package com.example.webview;import android.app.Activity;import android.app.ProgressDialog;import android.os.Bundle;import android.view.KeyEvent;import android.webkit.WebChromeClient;import android.webkit.WebSettings;import android.webkit.WebView;import android.webkit.WebViewClient;public class MainActivity extends Activity {    private WebView webView;    private String url = "http://www.baidu.com";    private ProgressDialog progressDialog;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initWebView();    }    private void initWebView() {        webView = (WebView) findViewById(R.id.webview);// 获取控件        webView.loadUrl(url);// 载入指定url（系统自带浏览器，若想用自身webview需要重写方法,提供client）        WebSettings webSettings = webView.getSettings();// 获取配置信息        webSettings.setJavaScriptEnabled(true);// 是否允许加载js文件        webSettings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);// 打开缓存        webView.setWebViewClient(new WebViewClient() {            /**             * 重写shouldOverrideUrlLoading，返回值若为true则用webview，false则是系统自身浏览器             */            @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) {// newProgress当前进度                if (newProgress == 100) {                    // 加载完毕，关闭进度条                    closeProgressDialog();                } else {                    //加载未完成，显示进度                    showProgressDialog(newProgress);                }                super.onProgressChanged(view, newProgress);            }            private void closeProgressDialog() {                progressDialog.dismiss();                progressDialog=null;                            }            private void showProgressDialog(int newProgress) {                if (progressDialog == null) {                    progressDialog = new ProgressDialog(MainActivity.this);                    progressDialog.setTitle("页面正在加载中..请稍后");                    progressDialog                            .setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);//设置进度条样式                    progressDialog.setProgress(newProgress);//设置进度                    progressDialog.show();                } else {                    progressDialog.setProgress(newProgress);                    progressDialog.show();                }            }        });    }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {// keyCode代表按键的数字标示符        if (keyCode == KeyEvent.KEYCODE_BACK) {            if (webView.canGoBack()) {                webView.goBack();                return true;            } else {                System.exit(0);            }        }        return super.onKeyDown(keyCode, event);    }}

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