在黑莓树视图中添加图像图标

Question

我在blackberry java app中设计了一个简单的树视图。现在我需要在子节点中添加一个图像。

有可能吗？

Answer 1

找到这段代码

class TreefieldDemoScreen extends MainScreen
{
    public TreefieldDemoScreen()
    {             
        setTitle("Tree Field with icon");
        String parentNode =  new String("Parent");
        String firstChild =  new String("first child");
        String secondChild =  new String("second child");
        String thirdChild =  new String("third child");

        TreeCallback myCallback = new TreeCallback();
        TreeField myTree = new TreeField(myCallback, Field.FOCUSABLE);

        int node2 = myTree.addChildNode(0, parentNode);
        myTree.addChildNode(node2, firstChild);
        myTree.addChildNode(node2, secondChild);
        myTree.addChildNode(node2, thirdChild);
        add(myTree);
    }

    private class TreeCallback implements TreeFieldCallback 
    {
        public void drawTreeItem(TreeField _tree, Graphics g, int node, int y, int width, int indent) 
        {
            String text = (String)_tree.getCookie(node); 
            Bitmap b=Bitmap.getBitmapResource("icon_bb copy.png");
            g.drawText(text, indent+b.getWidth(), y);

            g.drawBitmap(indent, y, b.getWidth(), b.getHeight(), b, 0, 0);
        }
    }
}