View进行透明度设置
对特定View进行透明度设置的代码片段：

public void setViewAlpha(ImageView mBtn, boolean isChecked) {// 这就是BUTTON不可用时盖在背景上面的颜色int m_disableColor = Color.argb(150, 255, 75, 75);Drawable bkDrawable = mBtn.getBackground().mutate();if (null != bkDrawable) {if (!isChecked) {bkDrawable.clearColorFilter();} else {bkDrawable.setColorFilter(m_disableColor,PorterDuff.Mode.DST_OUT);}}mBtn.setBackgroundDrawable(bkDrawable);}