Check out the AsyncTask object:
http://developer.android.com/reference/android/os/AsyncTask.html
Simple sample would be like:
private class AsyncInit extends AsyncTask<Void, Void, Void>
{
public static boolean bThreadRunning = false;
public Context context;
private ProgressDialog pdDialog;
@Override
protected void onPreExecute()
{
bThreadRunning = true;
pdDialog = ProgressDialog.show( context, "", "Doing something,
please wait...", true );
}
@Override
protected void onPostExecute(Void result)
{
bThreadRunning = false;
pdDialog.dismiss();
}
@Override
protected Void doInBackground(Void... params)
{
// Do something here in the background
return null;
}
}
Then you can just activate that by this:
public void openBackground( Context context )
{
if( !AsyncInit.bThreadRunning )
{
AsyncInit atInit = new AsyncInit();
atInit.context = context;
atInit.execute( null, null, null );
}
}
There are other options available also, check out Threads, Handlers and
Runnables also.
Steven
Studio LFP
http://www.studio-lfp.com
On Sunday, October 9, 2011 8:12:51 AM UTC-5, Muchamad Jeffri wrote:
>
> hello, i want to ask how to implement progress bar spinner in
> background and then stop when parsing JSON data finish to list view.
> this my source code.
>
> package com.cob.json;
>
> import java.lang.reflect.Type;
> import java.util.ArrayList;
> import java.util.HashMap;
> import java.util.List;
> import java.util.Map;
>
> import android.app.Activity;
> import android.os.Bundle;
> import android.util.Log;
> import android.view.View;
> import android.widget.ListView;
> import android.widget.Toast;
>
> import com.google.gson.Gson;
> import com.google.gson.reflect.TypeToken;
>
> public class JSONListViewActivity extends Activity {
> /** Called when the activity is first created. */
> //ListView that will hold our items references back to main.xml
> ListView lstTest;
> //Array Adapter that will hold our ArrayList and display the items
> on the ListView
> ProjectsAdapter arrayAdapter;
>
> //List that will host our items and allow us to modify that array
> adapter
> ArrayList<Projects> prjcts=null;
> @Override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.main);
> //Initialize ListView
> lstTest= (ListView)findViewById(R.id.lstText);
>
> //Initialize our ArrayList
> prjcts = new ArrayList<Projects>();
> //Initialize our array adapter notice how it references the
> listitems.xml layout
> arrayAdapter = new ProjectsAdapter(JSONListViewActivity.this,
> R.layout.list_item,prjcts);
>
> //Set the above adapter as the adapter of choice for our list
> lstTest.setAdapter(arrayAdapter);
>
>
> //Instantiate the Web Service Class with he URL of the web
> service not that you must pass
> WebService webService = new WebService("http://
> frontine.hostoi.com/jsontest.json");
>
> //Pass the parameters if needed , if not then pass dummy one
> as follows
> Map<String, String> params = new HashMap<String, String>();
> params.put("var", "");
>
> //Get JSON response from server the "" are where the method
> name would normally go if needed example
> // webService.webGet("getMoreAllerts", params);
> String response = webService.webGet("", params);
>
> try
> {
> //Parse Response into our object
> Type collectionType = new TypeToken<ArrayList<Projects>>()
> {}.getType();
>
> //JSON expects an list so can't use our ArrayList from the
> lstart
> List<Projects> lst= new Gson().fromJson(response,
> collectionType);
>
> //Now that we have that list lets add it to the ArrayList
> which will hold our items.
> for(Projects l : lst)
> {
> prjcts.add(l);
> }
>
> //Since we've modified the arrayList we now need to notify
> the adapter that
> //its data has changed so that it updates the UI
> arrayAdapter.notifyDataSetChanged();
> }
> catch(Exception e)
> {
> Log.d("Error: ", e.getMessage());
> }
>
>
>
> }
> protected void onListItemClick(ListView lstTest, View v, int
> position, long id) {
> // TODO Auto-generated method stub
> //super.onListItemClick(l, v, position, id);
> String selection = lstTest.getItemAtPosition(position).toString();
> Toast.makeText(this, selection, Toast.LENGTH_LONG).show();
> }
>
>
> }
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