Is it possible to hide the ItemDecoration for the last item in a RecyclerView?

Question

I'm using the RecyclerView.ItemDecoration class to create dividers in the list, but I want to hide the divider for the last item in the list. Is this possible without having to implement the dividers myself?

Answer 1

You can try this,

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);
        }
    }
}

line_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="#F5F5F5" />
</shape>

Answer 2

Try Kotlin version, inspired by @Muthukrishnan Rajendran

CommentDetailItemDecoration.kt

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)
            }
        }
    }
}

ft_item_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_97" />

</shape>