Android:将Horizo​​ntalGridView设置为wrap_content？

Question

我将 Horizo​​ntalGridView 的宽度设置为 wrap_content。但它并没有根据其内容进行 self 调整。在下图中，白色条显示了 Horizo​​ntalGridView。我如何才能实现所需的行为？

 <android.support.v17.leanback.widget.HorizontalGridView
    android:id="@+id/list_view"
    android:width="wrap_content"
    android:height="match_parent"
    android:clipChildren="false"
    android:clipToPadding="false"
    android:focusable="true"
    lb:horizontalMargin="@dimen/menu_inter_card_spacing" 
    android:background="#FFFFFF"/>

Answer 1

为了实现这一点，我以这种方式重写 onMeasure 方法:

override fun onMeasure(widthSpec: Int, heightSpec: Int) {
    super.onMeasure(widthSpec, heightSpec)
    val widthMode = MeasureSpec.getMode(widthSpec)
    val widthSize = MeasureSpec.getSize(widthSpec)

    if(widthMode == AT_MOST) {
        var widthOnAdapterItems = 0
        adapter?.let {
            for (i in 0 until it.itemCount) {
                val viewType = it.getItemViewType(i)
                val viewHolder = it.createViewHolder(this,viewType)
                viewHolder.itemView.measure(widthSpec, heightSpec)
                widthOnAdapterItems += viewHolder.itemView.measuredWidth
            }
        }
        setMeasuredDimension(min(widthOnAdapterItems, widthSize), measuredHeight)
    }
}

这不是最佳的，但它可以工作。 ;)