I have a quite simple RecyclerView. This is how I set the divider
DividerItemDecoration itemDecorator = new DividerItemDecoration(getContext(), DividerItemDecoration.VERTICAL);
itemDecorator.setDrawable(ContextCompat.getDrawable(getActivity(), R.drawable.news_divider));
recyclerView.addItemDecoration(itemDecorator);
And this is drawable/news_divider.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
<solid android:color="@color/white_two"/>
<size android:height="1dp"/>
</shape>
The problem is for some stupid reason the divider is not just created in between the items. But also after the last item. And I want it only in between the items not after every item.
Any idea how to prevent the divider from showing after the last item?
Cheers and Thanks
Try this Code, it won't show divider for the last item.
public class DividerItemDecorator extends RecyclerView.ItemDecoration {
private Drawable mDivider;
public DividerItemDecorator(Drawable divider) {
mDivider = divider;
}
@Override
public void onDraw(Canvas canvas, RecyclerView parent, RecyclerView.State state) {
int dividerLeft = parent.getPaddingLeft();
int dividerRight = parent.getWidth() - parent.getPaddingRight();
int childCount = parent.getChildCount();
for (int i = 0; i <= childCount - 2; i++) {
View child = parent.getChildAt(i);
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
int dividerTop = child.getBottom() + params.bottomMargin;
int dividerBottom = dividerTop + mDivider.getIntrinsicHeight();
mDivider.setBounds(dividerLeft, dividerTop, dividerRight, dividerBottom);
mDivider.draw(canvas);
}
}
}
divider.xml:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<size
android:width="1dp"
android:height="1dp" />
<solid android:color="@color/grey_300" />
</shape>
Set your Divider like this:
RecyclerView.ItemDecoration dividerItemDecoration = new DividerItemDecorator(ContextCompat.getDrawable(context, R.drawable.divider));
recyclerView.addItemDecoration(dividerItemDecoration);
As proposed here you can extend DividerItemDecoration like this:
recyclerView.addItemDecoration(
new DividerItemDecoration(context, linearLayoutManager.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);
}
}
}
);
[UPDATE]
@Rebecca Hsieh pointed out:
This works when your item view in RecyclerView doesn't have a transparent background, for example,
<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>
DividerItemDecoration.getItemOffsets is called by RecyclerView to measure the child position. This solution will put the last divider behind the last item. Therefore the item view in RecyclerView should have a background to cover the last divider and this makes it look like hidden.
Other Solution
If you don't like divider being drawn behind, you can simply copy or extend DividerItemDecoration class and change its drawing behaviour by modifying for (int i = 0; i < childCount; i++) to for (int i = 0; i < childCount - 1; i++)
The accepted answer doesn't allocate space for decoration as it does not override getItemOffsets()
I have tweaked the DividerItemDecoration from support library to exclude the decoration from the last item
public class DividerItemDecorator extends RecyclerView.ItemDecoration {
private Drawable mDivider;
private final Rect mBounds = new Rect();
public DividerItemDecorator(Drawable divider) {
mDivider = divider;
}
@Override
public void onDraw(Canvas canvas, RecyclerView parent, RecyclerView.State state) {
canvas.save();
final int left;
final int right;
if (parent.getClipToPadding()) {
left = parent.getPaddingLeft();
right = parent.getWidth() - parent.getPaddingRight();
canvas.clipRect(left, parent.getPaddingTop(), right,
parent.getHeight() - parent.getPaddingBottom());
} else {
left = 0;
right = parent.getWidth();
}
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount - 1; i++) {
final View child = parent.getChildAt(i);
parent.getDecoratedBoundsWithMargins(child, mBounds);
final int bottom = mBounds.bottom + Math.round(child.getTranslationY());
final int top = bottom - mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(canvas);
}
canvas.restore();
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
if (parent.getChildAdapterPosition(view) == state.getItemCount() - 1) {
outRect.setEmpty();
} else
outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
}
}
To apply the decorator, use
RecyclerView.ItemDecoration dividerItemDecoration = new DividerItemDecorator(dividerDrawable);
recyclerView.addItemDecoration(dividerItemDecoration);
The source for including orientation can be found here https://gist.github.com/abdulalin/146f8ca42aa8322692b15663b8d508ff
Here's the DividerDecorator class i use in my apps which removes the bottom line of last item.
public class DividerDecorator extends RecyclerView.ItemDecoration {
private Drawable mDivider;
public DividerDecorator(Context context) {
mDivider = context.getResources().getDrawable(R.drawable.recyclerview_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.getChildCount();
for (int i = 0; i < childCount; i++) {
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);
}
}
}
You can set it to your RecyclerView with the following code:
mRecyclerViewEvent.addItemDecoration(new DividerDecorator(context));
Here's the recyclerview_divider.xml
<size
android:width="1dp"
android:height="1dp" />
<solid android:color="@color/DividerColor" />
Create your own Divider class (Example here)
In the code that draws the divider, check first if you are drawing the divider for the last item in the list. If so, don't draw it.
Just be aware that if you override OnDrawOver it draws on TOP of your view including scrollbars etc. Best to stick to OnDraw. Lots of examples on Google but this is a good tutorial on creating your own decorators.
This is a customized version of Android support DividerItemDecoration which ignore the last item:
https://gist.github.com/mohsenoid/8ffdfa53f0465533833b0b44257aa641
main difference is:
private fun drawVertical(canvas: Canvas, parent: RecyclerView) {
canvas.save()
val left: Int
val right: Int
if (parent.clipToPadding) {
left = parent.paddingLeft
right = parent.width - parent.paddingRight
canvas.clipRect(left, parent.paddingTop, right,
parent.height - parent.paddingBottom)
} else {
left = 0
right = parent.width
}
val childCount = parent.childCount
for (i in 0 until childCount - 1) {
val child = parent.getChildAt(i)
parent.getDecoratedBoundsWithMargins(child, mBounds)
val bottom = mBounds.bottom + Math.round(child.translationY)
val top = bottom - mDivider!!.intrinsicHeight
mDivider!!.setBounds(left, top, right, bottom)
mDivider!!.draw(canvas)
}
canvas.restore()
}
private fun drawHorizontal(canvas: Canvas, parent: RecyclerView) {
canvas.save()
val top: Int
val bottom: Int
if (parent.clipToPadding) {
top = parent.paddingTop
bottom = parent.height - parent.paddingBottom
canvas.clipRect(parent.paddingLeft, top,
parent.width - parent.paddingRight, bottom)
} else {
top = 0
bottom = parent.height
}
val childCount = parent.childCount
for (i in 0 until childCount - 1) {
val child = parent.getChildAt(i)
parent.layoutManager.getDecoratedBoundsWithMargins(child, mBounds)
val right = mBounds.right + Math.round(child.translationX)
val left = right - mDivider!!.intrinsicWidth
mDivider!!.setBounds(left, top, right, bottom)
mDivider!!.draw(canvas)
}
canvas.restore()
}
来源：https://stackoverflow.com/questions/46215810/recyclerview-remove-divider-decorator-after-the-last-item