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BOOK: Professional Android Application Development ISBN: 978-0-470-34471-2
This is the forum to discuss the Wrox book Professional Android Application Development by Reto Meier; ISBN: 9780470344712
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Old March 16th, 2009, 05:06 PM
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Default Update Listview after Thread

Hi, I really dont fine a solution....
I like that my listview GUI appears immediatly when the app starts.
Than load some new data in the Background Thread and update the Listview when done. But always when the Thread is done, the Listview keeps unchanged.

Bellow an sample (if fixed) that would be help to finish my Project.

thanks chris


/***
Copyright (c) 2008-2009 CommonsWare, LLC

Licensed under the Apache License, Version 2.0 (the "License"); you may
not use this file except in compliance with the License. You may obtain
a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package com.commonsware.android.fancylists.three;

import android.app.Activity;
import android.app.ListActivity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.ArrayAdapter;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class DynamicDemo extends ListActivity
{
TextView selection;
String[] items =
{ "lorem", "ipsum", "dolor", "sit", "amet", "consectetuer", "adipiscing",
"elit", "morbi", "vel", "ligula", "vitae", "arcu", "aliquet",
"mollis", "etiam", "vel", "erat", "placerat", "ante", "porttitor",
"sodales", "pellentesque", "augue", "purus" };
private Handler mHandler;

int ddd = 0;


private static final String TAG = "CheckLister";

@Override
public void onCreate(Bundle icicle)
{
super.onCreate(icicle);

setContentView(R.layout.main);
setListAdapter (new IconicAdapter(this));

selection = (TextView) findViewById(R.id.selection);

items[1] = "123";
mHandler = new Handler();
checkUpdate.start();

}

private Thread checkUpdate = new Thread()
{
public void run()
{
try
{
// just to keep the thread a bit busy:
for (int j = 0; j < 2993779; j++)
{
ddd = ddd +j-3*2;
}

// --------

mHandler.post(showUpdate);
//runOnUiThread(showUpdate);

} catch (Exception e)
{
}

}

};



private Runnable showUpdate = new Runnable()
{
public void run()
{

items[1] = ""+ddd; //this should be updatete immediatly !!!
items[2] = "jkjkjkj";

}
};

public void onListItemClick(ListView parent, View v, int position, long id)
{
selection.setText(items[position]);

}

class IconicAdapter extends ArrayAdapter
{
Activity context;

public IconicAdapter(Activity context)
{
super(context, R.layout.row, items);

this.context = context;
}

public View getView(int position, View convertView, ViewGroup parent)
{

View row = convertView;
if (row == null)
{
LayoutInflater inflater = context.getLayoutInflater();
row = inflater.inflate(R.layout.row, null);
}

TextView label = (TextView) row.findViewById(R.id.label);

label.setText(items[position]);

if (items[position].length() > 4)
{
ImageView icon = (ImageView) row.findViewById(R.id.icon);

icon.setImageResource(R.drawable.delete);
}

return (row);
}
}
}
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