ListActivity ListView completed load

Question

I want to set the background color depending on the data for the row of the ListView. I implemented a ListActivity but I dont know how to get notified the load is completed so that I can access the rows of the ListView.

public class RouteList extends ListActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.route_list);

    CommuteDb db = new CommuteDb(this);
    Cursor cursor = db.getRouteList();
    ListAdapter adapter = new SimpleCursorAdapter(this, // Context.
        R.layout.route_row, //row template
        cursor, // Pass in the cursor to bind to.
        new String[] { BaseColumns._ID, "Name" }, //Columns from table
        new int[] { R.id.id, R.id.name }, //View to display data
        0); //FLAG_REGISTER_CONTENT_OBSERVER

    setListAdapter(adapter);

    ListView listView = (ListView) findViewById(android.R.id.list);
    Log.i("RouteList","listView.getChildCount()=" + listView.getChildCount()); //returns always 0
//Loop will not execute because no row yet
    for (int i=0; i < listView.getChildCount(); i++) {
        View rowView = listView.getChildAt(i);
        Log.i("RouteList",rowView.getClass().getName());
        rowView.setBackgroundColor(0x88ff0000);
    }

If I execute this loop later (for instance on user's request) I am able to get each row and assign the color I want. However I need to do this automatically after data are loaded in ListView.

You can use custom adpaters in this case and in getview methord you can check the data and set teh background color accordingly — Triode, Feb 19 '13 at 09:32
check this http://stackoverflow.com/questions/5300787/how-do-i-create-a-custom-cursor-adapter-for-a-listview-for-use-with-images-and-t — Naveen, Feb 19 '13 at 09:35

GuyOlivier · Accepted Answer · 2013-02-21T09:49:53.847

Thanx for the hint guys.
It works after modifying the code this way: I added a custom adapter (RouteAdapter) derived from SimpleCursorAdapter:

private class RouteAdapter extends SimpleCursorAdapter {

    public RouteAdapter(Context context, int layout, Cursor c,
            String[] from, int[] to, int flags) {
        super(context, layout, c, from, to, flags);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        //Let the default getView do the job (inflate the row layout and set views to their values from database  
        View view = super.getView(position, convertView, parent);
        //Get the resulting view (route_row) and do custom loading
        TextView isOffer = (TextView) view.findViewById(R.id.isOffer);
        if (isOffer.getText().equals("0"))
                view.setBackgroundColor(0x8800ff00); //seek=green
            else
                view.setBackgroundColor(0x88ff0000); //offer=red

        return view;
    }
}

Then in my original code I just replaced SimpleCursorAdapter by RouteAdapter:

ListAdapter adapter = new RouteAdapter(this, // Context.

ListActivity ListView completed load

1 Answers1