java - 如何设置进度条以在android中加载数据的 Activity

Question

这是我第一次进行 URL 加载的类(class)。

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

这是我的 Activity 类，其中数据在 WebView 中移动。

public class detailedview extends Activity
{
    WebView mWebView;
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.detailedview);
        GetSet gs = new GetSet();

        String title = gs.getTitle();
        String desc = gs.getDesc();

        mWebView = (WebView) findViewById(R.id.webview);
        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.getSettings().setBuiltInZoomControls(true);
        mWebView.getSettings().setSupportZoom(true);
        mWebView.getSettings().setTextSize(TextSize.SMALLER);
        mWebView.loadDataWithBaseURL("", "<p  align=\"justify\"><b> " + title+"</p></b><p align=\"justify\"><br>"+ desc + "</p></br>", "text/html", "utf-8", "");
        mWebView.setWebViewClient(new HelloWebViewClient());
    }
}

我想在我的 Activity 中添加加载数据的进度条，我已经尝试了很多，但我做不到。

能否请您编写代码或发布代码，以便我可以在根据我的代码加载数据时有一个进度条。

Answer 1

将此代码添加到您的代码中

ProgressDialog pd = new ProgressDialog(detailedview .this);
                                       ^^^^^^^^^^^^
        pd.setMessage("Loading...");
        pd.show(); <-----

mWebView.setWebViewClient(new WebViewClient() {
^^^^^^^^    

@Override 
public void onPageFinished(WebView view, String url) { <-----
     super.onPageFinished(view, url);
     pd.dismiss(); <-----
   }
});
-------------------------------------------------------------------------------


public class detailedview extends Activity
{
    WebView mWebView;
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.detailedview);
        ProgressDialog pd = new ProgressDialog(detailedview .this);

        pd.setMessage("Loading...");
        pd.show(); 

       mWebView.setWebViewClient(new WebViewClient() {


@Override 
public void onPageFinished(WebView view, String url) { 
     super.onPageFinished(view, url);
     pd.dismiss(); 
   }
});
        GetSet gs = new GetSet();

        String title = gs.getTitle();
        String desc = gs.getDesc();

        mWebView = (WebView) findViewById(R.id.webview);
        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.getSettings().setBuiltInZoomControls(true);
        mWebView.getSettings().setSupportZoom(true);
        mWebView.getSettings().setTextSize(TextSize.SMALLER);
        mWebView.loadDataWithBaseURL("", "<p  align=\"justify\"><b> " + title+"</p></b><p align=\"justify\"><br>"+ desc + "</p></br>", "text/html", "utf-8", "");
      //  mWebView.setWebViewClient(new HelloWebViewClient());
    }
}