getItemCount 的问题

问题，当重写getItemCount 改变item的数量的时候，会造成源码中的getItemViewType 获取错误的item，进而导致崩溃
建议 val dataSize = data.size 改为 val dataSize=getDefItemCount()
/**
* Don't override this method. If need, please override [getDefItemViewType]
* 不要重写此方法，如果有需要，请重写[getDefItemViewType]
*
* @param position Int
* @return Int
*/
override fun getItemViewType(position: Int): Int {
if (hasEmptyView()) {
val header = headerWithEmptyEnable && hasHeaderLayout()
return when (position) {
0 -> if (header) {
HEADER_VIEW
} else {
EMPTY_VIEW
}
1 -> if (header) {
EMPTY_VIEW
} else {
FOOTER_VIEW
}
2 -> FOOTER_VIEW
else -> EMPTY_VIEW
}
}

    val hasHeader = hasHeaderLayout()
    if (hasHeader && position == 0) {
        return HEADER_VIEW
    } else {
        var adjPosition = if (hasHeader) {
            position - 1
        } else {
            position
        }
        val dataSize = data.size
        return if (adjPosition < dataSize) {
            getDefItemViewType(adjPosition)
        } else {
            adjPosition -= dataSize
            val numFooters = if (hasFooterLayout()) {
                1
            } else {
                0
            }
            if (adjPosition < numFooters) {
                FOOTER_VIEW
            } else {
                LOAD_MORE_VIEW
            }
        }
    }
}

Search the adapter implementation for the getItemViewType override shown in the issue, then trace how getItemCount and getDefItemCount are used for position calculations. Verify the behavior with headers, footers, and overridden item counts; done means the correct item view type is selected without a crash.