Why are my views not drawn?

Question

I am trying to make an android application with some dynamically inverted views. Currently, the only drawings that are visible are the circle in the middle of the view.

The views are in a grid, but they don't seem to draw them correctly.

This is what happens when the screen loads:

The orange block is a grid view with focus.

However, if I use my finger (or mouse) to drag the image, it will be correctly colored:

Why is this?

How can I get him to draw a second image all the time.

Here is the code I'm using:

public class ChooseTablePanel extends GamePanel {
    TableAdapter adapter;

    public ChooseTablePanel(Context context, GamePanel nextPanel,
            GamePanel failurePanel) {
        super(context, nextPanel, failurePanel);
        initialize();
    }

    public ChooseTablePanel(Context context, AttributeSet attrs,
            GamePanel nextPanel, GamePanel failurePanel) {
        super(context, attrs, nextPanel, failurePanel);
        initialize();
    }

    private void initialize() {     
        adapter = new TableAdapter(getContext());
        adapter.setTables(new int[] {5,4,3,2,1,6});

        GridView gridView = new GridView(getContext());
        gridView.setAdapter(adapter);
        gridView.setNumColumns(adapter.getCount()/3);

        this.addView(gridView);
        this.invalidate();
    }


    class TableAdapter extends BaseAdapter {
        private Context context;
        private TableView[] tables;

        public TableAdapter(Context context) {
            this.context = context;
        }

        public void setTables(int[] tables) {
            this.tables = new TableView[tables.length];

            for(int i = 0; i < tables.length; i++){
                this.tables[i] = new TableView(tables[i], context);
            }
        }

        public int getCount() {
            return tables.length;
        }

        public Object getItem(int position) {
            return tables[position];
        }

        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return 0;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            TableView tableView;
            if (convertView == null) {  // if it not recycled, initialize some attributes
                tableView = new TableView(1, this.context);
                tableView.setLayoutParams(new GridView.LayoutParams(85, 85));
                tableView.setPadding(8, 8, 8, 8);
            } else {
                tableView = (TableView) convertView;
            }

            tableView.invalidate();
            return tableView;
        }
    }

    class TableView extends View {
        private int seats;

        public TableView(int Seats, Context context) {
            super(context);
            this.seats = Seats;

            if(seats < 1){
                throw new IllegalArgumentException("Number of seats must be greater than one.");
            }
        }

        public int getSeats() {
            return seats;
        }

        @Override
        protected void onDraw(Canvas canvas){
            int tableWidth = canvas.getWidth() / 2;
            ShapeDrawable tableShape = new ShapeDrawable(new OvalShape());          
            tableShape.setBounds(canvas.getWidth()/2 - tableWidth/2, canvas.getHeight()/2 - tableWidth/2, canvas.getWidth()/2 + tableWidth/2, canvas.getHeight()/2 + tableWidth/2 );

            tableShape.draw(canvas);
            canvas.drawText(seats + "", 0, 0, new Paint());
        }


    }

}

Answer 1

Instead of using canvas.getWidth()and canvas.getHeight()try using this.getWidth()and this.getHeight().

Answer 2

, - , onDraw() Canvas . , Canvas:

@Override
protected void onDraw(Canvas canvas) {
    int tableWidth = canvas.getWidth() / 2;
    Log.i("onDraw", "w=" + canvas.getWidth() + ", h=" + canvas.getHeight());
    ShapeDrawable tableShape = new ShapeDrawable(new OvalShape());
    ...
}

Answer 3

Call me crazy, but what happens if you call invalidate () at the end of onDraw ()? For example, see this code snippet from APIDemos:

    @Override protected void onDraw(Canvas canvas) {
        canvas.drawColor(Color.WHITE);
        mDrawable.draw(canvas);
        invalidate();
    }