自定义属性 declare-styleable数据类型简介：

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一、reference：参考指定Theme中资源ID。

1.定义：

2.使用：

二、Color：颜色

1.定义：

2.使用：

三、boolean：布尔值

1.定义：

2.使用：

四、dimension：尺寸值

1.定义：

2.使用：

五、float：浮点型

1.定义：

2.使用：

六、integer：整型

1.定义：

2.使用：

七、string：字符串

1.定义：

2.使用：

八、fraction：百分数

1.定义：

2.使用：

九、enum：枚举

1.定义：

2.使用：

十、flag：位或运算

1.定义：

2.使用：

属性定义时可以指定多种类型值：

使用：

例子和使用

class EasyHeadViewClick : LinearLayout {
    private lateinit var mContentView: View
    private lateinit var mllHeadBottomView: LinearLayout
    private var headNum = 2
    private var headOneName = ""
    private var headTwoName = ""
    private var headThreeName = ""
    private var headFourName = ""
    private var mCLickPosition = 0
    private var listName = mutableListOf<String>()
    //默认背景
    private var mCLickBg = R.drawable.shape_stroke_orange_semicircle
    private var mNoCLickBg = R.drawable.shape_stroke_grey_semicircle

    constructor(context: Context?) : super(context) {
        init(null)
    }

    constructor(context: Context?, attrs: AttributeSet?) : super(context, attrs) {
        init(attrs)

    }

    constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr) {
        init(attrs)
    }

    private fun init(attrs: AttributeSet?) {
        mContentView = LayoutInflater.from(context).inflate(R.layout.head_bottom_view, this, false)
        mllHeadBottomView = mContentView.findViewById(R.id.mllHeadBottomView)
        if (attrs != null) {
            val attributes = context?.obtainStyledAttributes(attrs, R.styleable.EasyHeadViewClick)
            if (attributes != null) {
                for (index in 0 until attributes.indexCount) {
                    when (attributes.getIndex(index)) {
                        R.styleable.EasyHeadViewClick_head_num -> {
                            headNum = attributes.getInt(R.styleable.EasyHeadViewClick_head_num, 2)
                        }
                        R.styleable.EasyHeadViewClick_head_one_name -> {
                            headOneName = attributes.getString(R.styleable.EasyHeadViewClick_head_one_name)
                            listName.add(0, headOneName)
                        }
                        R.styleable.EasyHeadViewClick_head_two_name -> {
                            headTwoName = attributes.getString(R.styleable.EasyHeadViewClick_head_two_name)
                            listName.add(1, headTwoName)
                        }
                        R.styleable.EasyHeadViewClick_head_three_name -> {
                            headThreeName = attributes.getString(R.styleable.EasyHeadViewClick_head_three_name)
                            listName.add(2, headThreeName)
                        }
                        R.styleable.EasyHeadViewClick_head_four_name -> {
                            headFourName = attributes.getString(R.styleable.EasyHeadViewClick_head_four_name)
                            listName.add(3, headFourName)
                        }
                        R.styleable.EasyHeadViewClick_head_click_bg -> {
                            mCLickBg = attributes.getResourceId(R.styleable.EasyHeadViewClick_head_click_bg, R.drawable.shape_stroke_orange_semicircle)
                        }
                        R.styleable.EasyHeadViewClick_head_no_click_bg -> {
                            mNoCLickBg = attributes.getResourceId(R.styleable.EasyHeadViewClick_head_no_click_bg, R.drawable.shape_stroke_grey_semicircle)
                        }
                    }
                }
                if (headNum > 0) {
                    for (i in 0 until headNum) {
                        var view = LayoutInflater.from(context).inflate(R.layout.layout_head_view_click_item, this, false)
                        var textView = view.findViewById<TextView>(R.id.tv_head_view_click_item)
                        var mLayoutParams = LayoutParams(0, LayoutParams.MATCH_PARENT, 1.0f) //动态设置权重分配
                        mLayoutParams.leftMargin = DensityUtil.px2dp(8).toInt()
                        textView.layoutParams = mLayoutParams
                        textView.text = listName[i]
                        if (i == 0) {
                            textView.setBackgroundResource(mCLickBg)
                            textView.setTextColor(resources.getColor(R.color.colorAccent))
                        } else {
                            textView.setBackgroundResource(mNoCLickBg)
                            textView.setTextColor(resources.getColor(R.color.black_353535))
                        }
                        mllHeadBottomView?.addView(view)
                    }
                }
                attributes.recycle()
            }
        }
        initClick()
        /**
         * 执行才能展示
         */
        addView(mContentView)
    }

    private fun initClick() {
        for (i in 0 until headNum) {
            mllHeadBottomView?.getChildAt(i)?.setOnClickListener { setPayType(i) }
        }

    }

    private fun setPayType(payType: Int) {
        for (i in 0 until headNum) {
            (mllHeadBottomView?.getChildAt(i) as TextView)?.setBackgroundResource(R.drawable.shape_stroke_grey_semicircle)
            (mllHeadBottomView?.getChildAt(i) as TextView)?.setTextColor(UIUtil.getColor(R.color.black_353535))
        }
        (mllHeadBottomView?.getChildAt(payType) as TextView)?.setBackgroundResource(R.drawable.shape_stroke_orange_semicircle)
        (mllHeadBottomView?.getChildAt(payType) as TextView)?.setTextColor(UIUtil.getColor(R.color.colorAccent))
        mCLickPosition = payType + 1//位置从零开始 要加1
        mClickListener?.invoke(mCLickPosition.toString())
    }

    /**
     * 通过接口获取点击位置
     */
    private var mClickListener: ((mCLickPosition: String) -> Unit)? = null

    fun setClickViewListener(mCLickPosition: ((mCLickPosition: String) -> Unit)) {
        mClickListener = mCLickPosition
    }
}