Android Webview添加网页加载进度条实例详解

/*** 带进度条的Webivew* @author lirunzi@.com*/@SuppressWarnings("deprecation")public class ProgressWebView extends WebView {private final static String TAG = ProgressWebView.class.getSimpleName();private ProgressBar progressBar;private Context context;public ProgressWebView(Context context, AttributeSet attrs) {super(context, attrs);this.context = context;progressBar = new ProgressBar(context, null, android.R.attr.progressBarStyleHorizontal);progressBar.setLayoutParams(new AbsoluteLayout.LayoutParams(AbsoluteLayout.LayoutParams.MATCH_PARENT, , , ));progressBar.setProgressDrawable(getResources().getDrawable(R.drawable.wevbview_progressbar));addView(progressBar);setWebChromeClient(new WebChromeClient());}public class WebChromeClient extends android.webkit.WebChromeClient {@Overridepublic void onProgressChanged(WebView view, int newProgress) {Log.d(TAG, "newProgress" + newProgress);if (newProgress == ) {progressBar.setVisibility(GONE);} else {if (progressBar.getVisibility() == GONE)progressBar.setVisibility(VISIBLE);progressBar.setProgress(newProgress);}super.onProgressChanged(view, newProgress);}// 处理javascript中的console.log@Overridepublic boolean onConsoleMessage(ConsoleMessage cm){android.util.Log.d(TAG, "webview console " + cm.lineNumber() + " of " + cm.sourceId() + " : " + cm.message());return true;}// 处理javascript中的alert()@Overridepublic boolean onJsAlert(WebView view, String url, String message, JsResult result) {ToastUtil.showMessage(context, message, Toast.LENGTH_SHORT, Gravity.CENTER);result.cancel();return true;}}@Overrideprotected void onScrollChanged(int l, int t, int oldl, int oldt) {LayoutParams lp = (LayoutParams) progressBar.getLayoutParams();lp.x = l;lp.y = t;progressBar.setLayoutParams(lp);super.onScrollChanged(l, t, oldl, oldt);}} 

<cn.net.huami.ui.view.ProgressWebView android:id="@+id/them_webview"android:layout_width="match_parent"android:layout_height="match_parent" /> 

<?xml version="." encoding="utf-"?><layer-list xmlns:android="http://schemas.android.com/apk/res/android" ><!-- 背景 --><item android:id="@android:id/background"><shape><solid android:color="@color/default_bg" /></shape></item><!-- 进度条 --><item android:id="@android:id/progress"><clip><shape><solid android:color="#EAE" /></shape></clip></item></layer-list> 

ProgressWebView webView = (ProgressWebView)findViewById(R.id.them_webview);webView.setDownloadListener(new DownloadListener() {@Overridepublic void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {if (url != null && url.startsWith("http://"))startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));}});webView.loadUrl("网页url");