ItemDecor

RecyclerView.ItemDecoration的简易写法，轻松实现RecyclerView的Divider。

LinearItemDecor	GridItemDecor	MultiItemDecor

导入依赖

maven { url 'https://jitpack.io' }

implementation 'com.github.simplepeng:ItemDecor:v1.0.3'

LinearItemDecor

val itemDecor = LinearItemDecor().apply {
    size = 10
    color = Color.BLACK
    retainLast = true//
    margin = 33.5f
}
//过滤点不需要显示的divider
itemDecor.filter(0, 1, 2)
//或
itemDecor.filter { position: Int ->
    position % 2 == 0
}
rvVertical.addItemDecoration(itemDecor)
  
//高级点，使用KT扩展函数
rvVertical.divider(Color.RED, 10, 20f, 100f)

默认最后的ItemDecoration是没有画出来的，可以使用retainLast属性保留最后一个。

filter方法可以用来过滤掉不需要显示的ItemDecoration。

GridItemDecor

val spaceItemDecor = GridItemDecor().apply {
    margin = 10
}
rvGrid.addItemDecoration(spaceItemDecor)
//扩展函数
rvGrid.space(10)

MultiTypeItemDecor

val decoration1 = LinearItemDecor()
decoration1.size = 20
decoration1.color = Color.LTGRAY

val decoration2 = LinearItemDecor()
decoration2.color = Color.BLACK

val decoration3 = LinearItemDecor()
decoration3.color = Color.BLUE
decoration3.size = 20

val decoration4 = LinearItemDecor()
decoration4.color = Color.GREEN
decoration4.size = 3
decoration4.margin = 115f

val decoration5: AbsItemDecor = ShaderItemDecor()

val multiTypeItemDecor = MultiTypeItemDecor { position ->
    when (position) {
        0 -> decoration3
        1 -> decoration2
        2 -> decoration4
        3 -> decoration5
        else -> decoration1
    }
}
recyclerView.addItemDecoration(multiTypeItemDecor)
//扩展函数
recyclerView.multiType { position ->
    when (position) {
        0 -> decoration3
        1 -> decoration2
        2 -> decoration4
        3 -> decoration5
        else -> decoration1
    }
}

自定义ItemDecor

class ShaderItemDecor : AbsItemDecor() {

    private val mPaint = Paint(Paint.ANTI_ALIAS_FLAG)
    private val mHeight = 50

    override fun onDraw(
        canvas: Canvas, position: Int,
        bounds: Rect, itemView: View,
        parent: RecyclerView, state: RecyclerView.State
    ) {
        mPaint.shader = LinearGradient(
            0f,
            0f,
            parent.width.toFloat(),
            50f,
            Color.YELLOW,
            Color.GREEN,
            Shader.TileMode.CLAMP
        )
        val bottom = bounds.bottom + Math.round(itemView.translationY)
        val top = bottom - mHeight
        canvas.drawRect(Rect(0, top, parent.width, bottom), mPaint)
    }

    override fun onDrawOver(
        canvas: Canvas, position: Int,
        bounds: Rect, itemView: View,
        parent: RecyclerView, state: RecyclerView.State
    ) {
    }

    override fun setOutRect(
        outRect: Rect, position: Int,
        itemView: View,
        parent: RecyclerView, state: RecyclerView.State
    ) {
        outRect[0, 0, 0] = mHeight
    }
}

赞助

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扶贫方式 ---- 赞助列表

问题反馈

尽量先提issue，实在无解再加QQ群：1078185041

版本迭代

• v1.0.3：优化
• v1.0.2：升级为KT，写法更轻松。
• v1.0.1：修复bug
• v1.0.0：首次上传