Question

我在android.it上有tab + swipe app工作正常。我使用asyntask方法在第二页上使用json从url加载数据，它也可以正常工作。但是当它加载数据时，我会显示进度条。问题是在第一页上看到进度对话框。我想只看到第二页。我怎么能这样做？

谢谢，

修改

这是我的代码

public class web_get_thread扩展了AsyncTask {

private ProgressDialog progressDialog = new ProgressDialog(context);
InputStream inputStream = null;
String result = ""; 

protected void onPreExecute() {
    progressDialog.setMessage("Loading data...");
    progressDialog.show();
    progressDialog.setOnCancelListener(new OnCancelListener() {
        public void onCancel(DialogInterface arg0) {
            web_api_get_thread.this.cancel(true);
        }
    });
}

@Override
protected String doInBackground(String... params) {

    StringBuilder builder = new StringBuilder();
    try {
        // Set up HTTP post

        // HttpClient is more then less deprecated. Need to change to URLConnection 
        HttpClient client = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(params[0]); 
        HttpResponse response = client.execute(httpGet);
        StatusLine statusLine = response.getStatusLine();
        int statusCode = statusLine.getStatusCode();
      if (statusCode == 200) {
        HttpEntity entity = response.getEntity();
        InputStream content = entity.getContent();
        BufferedReader reader = new BufferedReader(new InputStreamReader(content));
        String line;
        while ((line = reader.readLine()) != null) {
          builder.append(line);
        }
      } else {
       // Log.e(ParseJSON.class.toString(), "Failed to download file");
      }  
    } catch (UnsupportedEncodingException e1) {
        Log.e("UnsupportedEncodingException", e1.toString());
        e1.printStackTrace();
    } catch (ClientProtocolException e2) {
        Log.e("ClientProtocolException", e2.toString());
        e2.printStackTrace();
    } catch (IllegalStateException e3) {
        Log.e("IllegalStateException", e3.toString());
        e3.printStackTrace();
    } catch (IOException e4) {
        Log.e("IOException", e4.toString());
        e4.printStackTrace();
    }
    // Convert response to string using String Builder  
    return builder.toString(); 
} // protected Void doInBackground(String... params)


protected void onPostExecute(String string) {

    //parse JSON data
    try{
        JSONArray jArray = new JSONArray(string);

        this.progressDialog.dismiss();

    } catch (JSONException e) {

        Log.e("JSONException", "Error: " + e.toString());

    } // catch (JSONException e)


} // protected void onPostExecute(Void v)

}

Answer 1

您可以在开始加载网址时显示ProgressBar，并在加载完成后使其不可见。为此，您只需实施WebViewClient并扩展onPageStarted和onPageFinished()，如下所示：

mWebView.setWebViewClient(new WebViewClient() {

            @Override
            public void onPageStarted(WebView view, String url, Bitmap facIcon) {
                mProgressBar.setVisibility(View.VISIBLE);
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                mProgressBar.setVisibility(View.GONE);
            }
        });

当我在那里刷第二页时，我想看看progressdialog？

1 个答案: