android 数字选择器中文字颜色透明度渐变的实现_whuthm的专栏

首先看android View源码中渐变的实现

draw方法

boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0;
        boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0;boolean h