如何在屏幕底部添加按钮并将文本编辑为页面的第三列？

i want to create a page ,in such a way that a list should come in which first two columns,shows product name and its cost,and the third column should be an edit text to fill quantity.moreover i need three buttons at the bottom of the page.i am a newbie t android programming,plz helpi want to create a page ,in such a way that a l