Can I show progress dialog and error message when parsing XML with JavaScript?
I am developing an android web app for a blog like a website. To do this, I display a list of HTML page content categories which, when clicked, shows articles related to that category.
I am pulling these articles from website rss feeds which are in XML format and using JavaScript. I am parsing it for display on an HTML page.
This XML parsing process takes a long time to load the page. During this period, I get a blank screen. I have implemented a progress dialog that works fine when the page is loaded the first time, but when the XML is processed by JavaScript, it doesn't appear.
This is how I applied the Process dialog. Activity.java:
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
setContentView(R.layout.main);
getWindow().setFeatureInt(Window.FEATURE_PROGRESS,
Window.PROGRESS_VISIBILITY_ON);
webview = (WebView) findViewById(R.id.webview);
webview.getSettings().setJavaScriptEnabled(true);
webview.setBackgroundColor(0);
final ProgressDialog progressDialog = new ProgressDialog(activity);
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setMessage("Loading...please wait");
progressDialog.setCancelable(true);
webview.setWebViewClient(new WebViewClient()
{
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
view.loadUrl(url);
return true;
}
});
webview.loadUrl("file:///android_asset/HomePage.html");
// WebChromeClient give progress etc info
webview.setWebChromeClient(new WebChromeClient()
{
public void onProgressChanged(WebView view, int progress)
{
progressDialog.show();
progressDialog.setProgress(0);
activity.setProgress(progress * 1000);
progressDialog.incrementProgressBy(progress);
if (progress == 100 && progressDialog.isShowing())
progressDialog.dismiss();
}
});
}
- How can I show the progress dialog when XML is being processed by JavaScript?
- Also I want to show an error message if there is no internet connectivity for the same thing - is there any way to do this?
- I used a call function like "tel: phone number" which worked but after I added the public boolean shouldOverrideUrlLoading doesn't work? what I did wrong?
+3
source to share
1 answer
for your questions you can use the following code in your activity.java file
package com.package name;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.TextView;
import android.widget.Toast;
public class Myactivity extends Activity {
TextView myLabel;
WebView wv;
final Activity activity=this;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
setContentView(R.layout.main);
getWindow().setFeatureInt(Window.FEATURE_PROGRESS,Window.PROGRESS_VISIBILITY_ON);
wv=(WebView)findViewById(R.id.webview);
wv.getSettings().setJavaScriptEnabled(true);
wv.setBackgroundColor(0);
final ProgressDialog progressDialog = new ProgressDialog(activity);
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setMessage("Loading...please wait");
progressDialog.setCancelable(true);
wv.setWebViewClient(new WebViewClient()
{
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
if (url.startsWith("tel:")) {
Intent intent = new Intent(Intent.ACTION_DIAL,
Uri.parse(url));
startActivity(intent);
return true;
}else{
view.loadUrl(url);
return true;
}
}
});
wv.loadUrl("file:///android_asset/page.html");
// WebChromeClient give progress etc info
wv.setWebChromeClient(new WebChromeClient()
{
public void onProgressChanged(WebView view, int progress)
{
progressDialog.show();
progressDialog.setProgress(0);
activity.setProgress(progress * 1000);
progressDialog.incrementProgressBy(progress);
if (progress == 100 && progressDialog.isShowing())
progressDialog.dismiss();
}
});
if (AppStatus.getInstance(this).isOnline(this)) {
Toast t = Toast.makeText(this,"Welcome !!!!",8000);
t.show();
} else {
AlertDialog alertDialog = new AlertDialog.Builder(
CafeNashikActivity.this).create();
// Setting Dialog Title
alertDialog.setTitle("No Internet");
// Setting Dialog Message
alertDialog.setMessage("Internet Connection not available!");
// Setting Icon to Dialog
//alertDialog.setIcon(R.drawable.tick);
// Setting OK Button
alertDialog.setButton("Exit", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
MyActivity.this.finish();
}
});
// Showing Alert Message
alertDialog.show();
}
}
}
Hope this helps you.
+2
source to share