加载 WebView 时的 Android ProgressBar [英] Android ProgessBar while loading WebView

问题描述

在我的应用程序中，我有一个 WebView 可以从 Internet 加载任何 URL.现在，有时由于网络速度较慢，页面加载时间较长，用户只能看到空白屏幕.

In my application, I have a WebView which loads any URL from the internet. Now, sometimes due to slow networks the page takes a long time to load and the user sees only a blank screen.

我想在 WebView 加载时显示 ProgressBar 并在 WebView 获取时隐藏 ProgessBar已完全加载.

I want to show a ProgressBar while the WebView gets loaded and hide the ProgessBar when the WebView gets loaded completely.

我知道如何使用 ProgressBar 和 AsyncTasks，但这是我的问题.

I know how to use the ProgressBar and AsyncTasks, but here is my problem.

这是我用来加载我的 WebView 的代码.

This is the code that I use to load my WebView.

    mWebView = (WebView) findViewById(R.id.webview);
    mWebView.getSettings().setJavaScriptEnabled(true);
    mWebView.setWebViewClient(new HelloWebViewClient());
    mWebView.loadUrl(web_URL);

这是我的自定义 WebViewClient 类

private class HelloWebViewClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
}

现在，如果我尝试使用 AsyncTasks显示 ProgressBar 那么我想我将不得不提供代码来加载 URL在我的 AsyncTask 的 doInBackGround() 函数中，并通过 onProgressUpdate() 函数显示进度.

Now, if I try to show the ProgressBar using AsyncTasks then I guess I would have to give the code to load the URL in the doInBackGround() function of my AsyncTask and show the progress through the onProgressUpdate() function.

但是，我如何在 doInBackground() 中加载 URL，因为 doInBackground() 在 非 UI 线程 上运行，我将无法使用 mWebView.loadUrl(web_URL) 在里面.

But, how do I load the URL inside the doInBackground() as doInBackground() runs on the Non-UI thread and I wont be able to use mWebView.loadUrl(web_URL) inside it.

有什么建议吗?我错过了一些明显的东西吗?请指导我.

Any suggestions? Am I missing something obvious? Please guide me.

推荐答案

查看源代码.帮您解决问题...

Check the source code. Help you and solve your problem...

public class AppWebViewClients extends WebViewClient {
     private ProgressBar progressBar;

    public AppWebViewClients(ProgressBar progressBar) {
        this.progressBar=progressBar;
        progressBar.setVisibility(View.VISIBLE);
    }
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        // TODO Auto-generated method stub
        view.loadUrl(url);
        return true;
    }

    @Override
    public void onPageFinished(WebView view, String url) {
        // TODO Auto-generated method stub
        super.onPageFinished(view, url);
        progressBar.setVisibility(View.GONE);
    }
}

我认为它对你有帮助.

谢谢.

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