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androidx.leanback.widget.HorizontalGridView获取屏幕上最后一个可见项目位置

leanback android-tv kotlin

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Thought · 技术社区 · 3 年前

我试图得到a中最后一个项目的X位置 androidx.leanback.widget.HorizontalGridView

到目前为止,我有这样的东西,有时有效,而其他人则不行

private fun getXOffsetViewBindOfLastView(): Float? {
    val childView = viewBinding.rvItems.layoutManager?.findViewByPosition(viewBinding.rvItems.childCount - 1) ?: return null

    viewBinding.rvItems.layoutManager

    val offsetViewBounds = Rect()
    //returns the visible bounds
    childView.getDrawingRect(offsetViewBounds)
    // calculates the relative coordinates to the parent
    viewBinding.rvItems.offsetDescendantRectToMyCoords(childView, offsetViewBounds)

    val relativeTop: Int = offsetViewBounds.top
    val relativeLeft: Int = offsetViewBounds.left
    val relativeBottom: Int = offsetViewBounds.bottom
    val relativeRight: Int = offsetViewBounds.right

    logger.d(TAG, "getXOffsetViewBindOfLastView", "lastView coordinates: top=$relativeTop, left=$relativeLeft, bottom=$relativeBottom, right=$relativeRight")
    return relativeRight.toFloat() - childView.width
}

xml就是这样。

    <androidx.leanback.widget.HorizontalGridView
    android:id="@+id/rv_items"
    android:layout_width="match_parent"
    android:layout_height="@dimen/rail_row_items_height"
    android:padding="@dimen/my_home_items_padding_top"
    android:layout_marginTop="@dimen/rail_row_items_margin_top"
    android:clipChildren="false"
    android:clipToPadding="false"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@id/rrh_header_item" />

有时,childView为null,它只是返回null。

因为这不是一个常规的 RecyclerView

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