Simple RecyclerView Divider

README.md

Simple RecyclerView Divider

Simple Horizontal Divider Item Decoration for RecyclerView

    mRecyclerView.addItemDecoration(new SimpleDividerItemDecoration(
            getApplicationContext()
    	));

NOTE: Add item decoration prior to setting the adapter

line_divider

<?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/dark_gray" />

</shape>

SimpleDividerItemDecoration.java

public class SimpleDividerItemDecoration extends RecyclerView.ItemDecoration {
    private Drawable mDivider;

    public SimpleDividerItemDecoration(Context context) {
        mDivider = context.getResources().getDrawable(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.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);
        }
    }
}

@keyoh
the onDrawover() method will draw the divider on the top of the item view。as a result, it also draws on the top of the scrollbar

The proposed code above adds a divider to every item including the last item.

So one can even use

<View 
  android:id="@+id/divider"
  android:layout_width="match_parent"
  android:layout_height="1dp"
  android:background="@color/holo_gray_light" />

in the layout for the item to get the same effect.

As a workaround, in the adapter I check if the child is the last item and change the visibility of the divider accordingly.

 @Override
    public void onBindViewHolder(ViewHolder viewHolder, final int position) {
       if(position==getItemCount()) //check if this is the last child, if yes then hide the divider
         viewHolder.divider.setVisibility(View.GONE);
    }

Any suggestions on this are welcome

It works like a charm! I wanted to use only the onDraw method so I added this other override to add space for the drawable:

@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
    outRect.bottom = mDivider.getIntrinsicHeight();
}

I hope it helps someone. Thanks!

@PsyGik

A couple quick comments: because the views are recycled, you'll want to make it visible if it's not the last item. You'll also never trigger this because position will never equal getItemCount() (as long as you're returning something like List.size()). Otherwise looks like a solid alternative that'll work with ListViews too :)

Here's a quick update to your code:

int visible = (position == getItemCount()-1) ? View.GONE : View.VISIBLE;
holder.divider.setVisibility(visible);

Thanks, works well.
Though getDrawable(int) is deprecated now. Use this instead:

ContextCompat.getDrawable(context, R.drawable.line_divider);

Thank's so much... it's work ....

@jonasbleyl : where is ContextCompat declaration?

ContextCompat is in the support library. ContextCompat.getDrawable(context, resourceID)

Thanks, works great.

thanks

Nice Work!
I've also included the default Android listDivider drawable inside the constructor if you don't want to implement a custom one:

public SimpleDividerItemDecoration(Context context) {
    final TypedArray a = context.obtainStyledAttributes(new int[]{android.R.attr.listDivider});
    mDivider = a.getDrawable(0);
    a.recycle();
}

Thanks.
I used this:

ResourcesCompat.getDrawable(context.getResources(), R.drawable.line_divider, context.getTheme());

I am not able to set divider to my RecyclerView can somebody help me for this?......

ResourcesCompat.getDrawable(context.getResources(), R.drawable.line_divider, context.getTheme());

where should i used this above code?please specify the location

Tried many, but this works like magic.

Thanks

it works
thanks alot

Works perfectly. Thank you

Good

I think custom drawable is not work

Hello,
Maybe use
ContextCompat

public SimpleDividerItemDecoration(Context context) { mDivider = ContextCompat.getDrawable(context, R.drawable.line_divider); }

Thanks a lot

Thanks,It worked!!

how can i made this?

https://developer.android.com/reference/android/support/v7/widget/DividerItemDecoration.html

val linearLayoutManager = LinearLayoutManager(this)
val dividerItemDecoration = DividerItemDecoration(recyclerView.context, linearLayoutManager.orientation)

// Init recyclerView
recyclerView.setHasFixedSize(true)
recyclerView.layoutManager = linearLayoutManager
recyclerView.addItemDecoration(dividerItemDecoration)

Use "card view" for item layout and set "margin top" according to your requirement.
:)

It works beauty... Thanks!

If you don't want the last item to have a divider line after it, simply change for (int i = 0; i < childCount; i++) { to for (int i = 0; i < childCount - 1; i++) { and it will skip the last item divider.