1.Java中定义颜色
int color = Color.GRAY;
int color = Color.argb(127,255,0,0);////半透明红色
int color = 0xaaff0000; //带有透明度的红色
2.在XML中定义颜色
// res/values/color.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="red">#ff0000</color>
<color name="green">#00ff00</color>
</resources>
//在Java代码中引用是
int color = getResources().getColor(R.color.mycolor);