如何在WebView中加载HTML页面时显示进度对话框

Question

我正在使用Web视图来显示HTML页面，并且我希望在加载页面之前显示进度对话框。完成后，对话框必须消失。我为此使用了AsyncTask，但对话框不显示。见下面我的代码：

class DownloadAysnc extends AsyncTask<String, String, Void> 
    { 
    ProgressDialog progressDialog; 
     @Override 
      protected void onPreExecute() { 
      super.onPreExecute(); 
      progressDialog = ProgressDialog.show(OverView.this, "", "Please Wait ..."); 
     } 

     @Override 
      protected Void doInBackground(String... arg0) { 
      webView.loadUrl("http://marico.com/html/investor/overview.php"); 
     return null; 
     } 

     @Override 
      protected void onPostExecute(Void result){ 
      super.onPostExecute(result); 
      progressDialog.dismiss(); 
     } 
    } 

如果我拿谷歌文档的帮助，以显示该网页，然后将HTML标记显示，而不是页面。以下是该代码：

String url = "http://google.co.in/"; 
String googleDocsUrl = "http://docs.google.com/viewer?url="+url; 
Intent intent = new Intent(Intent.ACTION_VIEW); 
intent.setDataAndType(Uri.parse(googleDocsUrl), "text/html"); 
startActivity(intent); 

this.myWebView.loadUrl(googleDocsUrl); 

有人可以帮助我吗？

Answer 1

使用此代码：

webView.setWebViewClient(new WebViewClient() { 
    ProgressDialog prDialog; 
    @Override 
    public void onPageStarted(WebView view, String url, Bitmap favicon) { 
     prDialog = ProgressDialog.show(Activity.this, null, "loading, please wait..."); 
     super.onPageStarted(view, url, favicon); 
    } 

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

webView.loadUrl(url); 

Answer 2

你可以试试下面的代码，

progDailog = ProgressDialog.show(loginAct,"Process ", "please wait....",true,true); 

new Thread (new Runnable() 
{ 
    public void run() 
    { 
     // your code goes here 
    } 
}).start(); 

Handler progressHandler = new Handler() 
{ 

    public void handleMessage(Message msg1) 
    { 
     progDailog.dismiss(); 
    } 
} 

Answer 3

您可以显示WebView的Progress在WebView中的标题栏。 Here是一个完整的示例，它显示WebView的Title栏中的ProgressStatus。

Answer 4

v.setWebChromeClient(new WebChromeClient(){ 
     @Override 
     public void onProgressChanged(WebView view, int newProgress) { 
      WebView v=(WebView)findViewById(R.id.wv); 
      //Toast.makeText(mContext, v.getUrl() + newProgress +"uploading...", Toast.LENGTH_SHORT).show(); 
      ProgressBar s=(ProgressBar)findViewById(R.id.progressBar1); 
      s.setMax(100); 
      s.setProgress(newProgress); 
      if(newProgress==100){       
       v.setVisibility(0); 
       //Toast.makeText(mContext, "upload finished...", Toast.LENGTH_SHORT).show(); 
     }else{ 
       v.setVisibility(8); 
       //Toast.makeText(mContext, "uploading...", Toast.LENGTH_SHORT).show(); 
      } 
     } 
    });