Android积木之PopupWindow

class DropListPopWin(var context: Context) : PopupWindow() {    var layoutInflater: LayoutInflater    lateinit var target: View    var mData: List? = null    init {        layoutInflater = LayoutInflater.from(context)        isFocusable = true        isTouchable = true        isOutsideTouchable = true    }    constructor(context: Context, view: View,mData:List) : this(context) {        target=view        this.mData=mData        initView(context)    }    fun initView(context: Context) {        this.target = target        width = target.measuredWidth        height = ViewGroup.LayoutParams.WRAP_CONTENT        setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))        contentView = layoutInflater.inflate(R.layout.home_pop_list, null)        var listView = contentView.findViewById(R.id.list)        listView.layoutManager=LinearLayoutManager(context)        listView.adapter = ListViewAdapter(mData!!, context)        super.setContentView(contentView)    }    fun show() {        var targetHeight = target.height        showAsDropDown(target!!, 0, -targetHeight / 2)    }}
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