GridView Help - Android Q&A, Help & Troubleshooting

The only thing I can find on this is how to organize apps on the homescreen. I'm setting up a GridView for my primary menu. I'm wanting to know how I can move the individual icons around. I'm going to have a total of at least five activities for this app so I want one icon in each corner and then one in the middle. Also, wouldn't hurt to know how I could have the icons autosize themselves depending on screen size what not. Here's my current code for the gridview.
Code:
package com.ThatOneNoob.smarthaul;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context c) {
mContext = c;
}
[user=439709]@override[/user]
public int getCount() {
// TODO Auto-generated method stub
return mThumbIds.length;
}
[user=439709]@override[/user]
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
[user=439709]@override[/user]
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
[user=439709]@override[/user]
public int getItemViewType(int arg0) {
// TODO Auto-generated method stub
return 0;
}
[user=439709]@override[/user]
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ImageView imageView;
if (convertView == null) { // if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
imageView.setPadding(8, 8, 8, 8);
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(mThumbIds[position]);
return imageView;
}
// references to our images
private Integer[] mThumbIds = {
R.drawable.data2, R.drawable.routing2
};
}