在 WebView 中添加进度条

本文介绍了在 WebView 中添加进度条的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在尝试向使用 WebView 的应用程序添加进度/加载栏.我对如何实现每次点击链接时出现的进度条感到困惑.

I am trying to add a progress/loading bar to my application that uses WebView. I am confused on how to implement a progress bar that appears every time a link is clicked.

当前代码:

public class CULearnBrowser extends Activity { WebView webview; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); webview = (WebView) findViewById(R.id.webview); webview.setWebViewClient(new HelloWebViewClient()); webview.getSettings().setJavaScriptEnabled(true); webview.loadUrl("culearn.colorado.edu/webct/entryPageIns.dowebct"); } private class HelloWebViewClient extends WebViewClient { @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { view.loadUrl(url); return true; } } public boolean onKeyDown(int keyCode, KeyEvent event) { if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) { webview.goBack(); return true; } return super.onKeyDown(keyCode, event); } }

活动布局:

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="schemas.android/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <WebView xmlns:android="schemas.android/apk/res/android" android:id="@+id/webview" android:layout_width="fill_parent" android:layout_height="fill_parent" /> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> </LinearLayout>

推荐答案

我在您的代码中添加了几行代码，现在它与进度条一起工作正常.

I have added few lines in your code and now its working fine with progress bar.

getWindow().requestFeature(Window.FEATURE_PROGRESS); setContentView(R.layout.main ); // Makes Progress bar Visible getWindow().setFeatureInt( Window.FEATURE_PROGRESS, Window.PROGRESS_VISIBILITY_ON); webview = (WebView) findViewById(R.id.webview); webview.setWebChromeClient(new WebChromeClient() { public void onProgressChanged(WebView view, int progress) { //Make the bar disappear after URL is loaded, and changes string to Loading... setTitle("Loading..."); setProgress(progress * 100); //Make the bar disappear after URL is loaded // Return the app name after finish loading if(progress == 100) setTitle(R.string.app_name); } }); webview.setWebViewClient(new HelloWebViewClient()); webview.getSettings().setJavaScriptEnabled(true); webview.loadUrl("www.google");