如何为VerticalFieldManager和/或Horizo​​ntalFieldManager设置背景透明度和颜色？

Question

The following code isn't working, I would appreciate some help.

HorizontalFieldManager hfm = new HorizontalFieldManager();
hfm.setBackground(BackgroundFactory.createSolidTransparentBackground(Color.BLACK, 0));

Answer 1

You are using 0 as alpha value on createSolidTransparentBackground(int color, int alpha) .

It will create a fully transparent background (not visible). Check the range of the alpha value in documentation.

It says , alpha - 0 (clear) to 255 (opaque) . Try other values for alpha, eg 127 .