我正在使用RecyclerView.ItemDecoration类在列表中创建分隔符,但我想隐藏列表中最后一项的分隔符。这可能不需要自己实施分隔线吗?
答案 0 :(得分:5)
你可以试试这个,
public class SimpleDividerItemDecoration extends RecyclerView.ItemDecoration {
private Drawable mDivider;
public SimpleDividerItemDecoration(Context context) {
mDivider = ContextCompat.getDrawable(context, R.drawable.line_divider);
}
@Override
public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
int left = parent.getPaddingLeft();
int right = parent.getWidth() - parent.getPaddingRight();
int childCount = parent.getAdapter().getItemCount();
for (int i = 0; i < childCount; i++) {
if (i == (childCount - 1)) {
continue;
}
View child = parent.getChildAt(i);
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
int top = child.getBottom() + params.bottomMargin;
int bottom = top + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
}
答案 1 :(得分:0)
尝试由@Muthukrishnan Rajendran启发的Kotlin版本
class CommentDetailItemDecoration(
context: Context
) : RecyclerView.ItemDecoration() {
val drawable: Drawable = ContextCompat.getDrawable(context, R.drawable.ft_item_divider)!!
override fun onDrawOver(c: Canvas, parent: RecyclerView, state: RecyclerView.State) {
val left = parent.paddingLeft
val right = parent.width - parent.paddingRight
val childCount = parent.adapter!!.itemCount
for (i in 0 until childCount - 1) {
val child = parent.getChildAt(i)
if (child != null) {
val params = child.layoutParams as RecyclerView.LayoutParams
val top = child.bottom + params.bottomMargin
val bottom = top + drawable.intrinsicHeight
drawable.setBounds(left, top, right, bottom)
drawable.draw(c)
}
}
}
}
答案 2 :(得分:-1)
<强> [UPDATE] 强>
当您在RecyclerView中的项目视图具有不透明的背景时,此工作,例如,
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="#ffffff">
...
</LinearLayout>
RecyclerItemDecoration.getItemOffsets由RecyclerView调用以测量子位置。此解决方案将最后一个分隔符放在最后一个项目后面。因此,RecyclerView中的项目视图应该有一个背景来覆盖最后一个分隔符,这使它看起来像隐藏。
感谢@Rebecca Hsieh的澄清您也可以这样做,(表单here):
recyclerView.addItemDecoration(
new DividerItemDecoration(context, layoutManager.getOrientation())) {
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
int position = parent.getChildAdapterPosition(view);
// hide the divider for the last child
if (position == parent.getAdapter().getItemCount() - 1) {
outRect.setEmpty();
} else {
super.getItemOffsets(outRect, view, parent, state);
}
}
});