How to stop gridview items shuffling when scrolling up/down in android

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Mobile

Android

I had an array list i am generating buttons inside the gridview ,The problem is when i starting to scroll up/down, all the previous button on the grid starting to show in different places. My guess I have a problem with the getView function inside my adapter. Please any help



public class CustomAdapter extends BaseAdapter {

private ArrayList mButtons = null;

public CustomAdapter(ArrayList b)
{
mButtons = b;
}

@Override
public int getCount()
{
return mButtons.size();
}

@Override
public Object getItem(int position)
{
return (Object) mButtons.get(position);

}

@Override
public long getItemId(int position)
{
//in our case position and id are synonymous
return position;

}

@Override
public View getView(int position, View convertView, ViewGroup parent)
{
CustomButton button;
if (convertView == null) {
button =(CustomButton) mButtons.get(position);
}
else
{
button = (CustomButton) convertView;
}
return button;

}

}