main.xml如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
   <WebView 
       android:id="@+id/webView"
       android:layout_width="fill_parent"
       android:layout_height="fill_parent"
       android:layout_centerInParent="true"
</RelativeLayout>
MainActivity如下:

package c.c;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.KeyEvent;
import android.webkit.WebView;
import android.webkit.WebViewClient;
 * Demo描述: WebView超时的处理
public class MainActivity extends Activity {
	private Timer mTimer;
	private WebView mWebView;
	private TimerTask mTimerTask;
	private final int TIMEOUT = 10000;
	private final int TIMEOUT_ERROR = 9527;
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		init();
	private Handler mHandler = new Handler() {
		public void handleMessage(Message msg) {
			if (msg.what == TIMEOUT_ERROR) {
				System.out.println("===》 收到消息: webView超时");
	private void init() {
		mWebView = (WebView) findViewById(R.id.webView);
		mWebView.getSettings().setJavaScriptEnabled(true);
		mWebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
		mWebView.getSettings().setSupportZoom(true);
		mWebView.getSettings().setDomStorageEnabled(true);
		mWebView.getSettings().setAllowFileAccess(true);
		mWebView.getSettings().setPluginsEnabled(true);
		mWebView.getSettings().setUseWideViewPort(true);
		mWebView.getSettings().setBuiltInZoomControls(true);
		mWebView.getSettings().setLoadWithOverviewMode(true);
		mWebView.requestFocus();
		mWebView.loadUrl("your url");
		mWebView.setWebViewClient(new WebViewClient() {
			@Override
			public boolean shouldOverrideUrlLoading(WebView view, String url) {
				return super.shouldOverrideUrlLoading(view, url);
			@Override
			public void onLoadResource(WebView view, String url) {
				super.onLoadResource(view, url);
			@Override
			public void onPageStarted(WebView view, String url, Bitmap favicon) {
				super.onPageStarted(view, url, favicon);
				System.out.println("======> onPageStarted 开始加载");
				mTimer = new Timer();
				mTimerTask = new TimerTask() {
					@Override
					public void run() {
						// 在TIMEOUT时间后,则很可能超时.
						// 此时若webView进度小于100,则判断其超时
						// 随后利用Handle发送超时的消息
						System.out.println("======> mWebView.getProgress()="+ mWebView.getProgress());
						if (mWebView.getProgress() < 100) {
							Message msg = new Message();
							msg.what = TIMEOUT_ERROR;
							mHandler.sendMessage(msg);
							if (mTimer != null) {
								mTimer.cancel();
								mTimer.purge();
						if (mWebView.getProgress() == 100) {
							System.out.println("======> 未超时");
							if (mTimer != null) {
								mTimer.cancel();
								mTimer.purge();
				mTimer.schedule(mTimerTask, TIMEOUT, 1);
			@Override
			public void onPageFinished(WebView view, String url) {
				super.onPageFinished(view, url);
				System.out.println("======> onPageFinished 加载完成");
				if (mTimer != null) {
					mTimer.cancel();
					mTimer.purge();
	// 处理Back键
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == event.KEYCODE_BACK && mWebView.canGoBack()) {
			mWebView.goBack();
			return true;
		return super.onKeyDown(keyCode, event);
页面缓存：加载一个网页时的html、JS、CSS等页面或者资源数据，这些缓存资源是由于浏览器 
的行为而产生，开发者只能通过配置HTTP响应头影响浏览器的行为才能间接地影响到这些缓存数据。