Add Margins To Divider In RecyclerView

i am building an android app which is using RecyclerView. I want to add dividers to RecyclerView, which I did using this code: DividerItemDecoration dividerItemDecoration = new Div

Solution 1:

I think the most straightforward solution is to use the setDrawable method on the Decoration object and pass it an inset drawable with the inset values you want for the margins. Like so:

int[] ATTRS = new int[]{android.R.attr.listDivider};

TypedArray a = context.obtainStyledAttributes(ATTRS);
Drawable divider = a.getDrawable(0);
int inset = getResources().getDimensionPixelSize(R.dimen.your_margin_value);
InsetDrawable insetDivider = new InsetDrawable(divider, inset, 0, inset, 0);
a.recycle();

DividerItemDecoration itemDecoration = new DividerItemDecoration(context, DividerItemDecoration.VERTICAL);
itemDecoration.setDrawable(insetDivider);
recyclerView.addItemDecoration(itemDecoration);

Solution 2:

shape.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#E6E7F0" />
    <size android:height="1dp" />
</shape>

layer.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:drawable="@drawable/shape"
        android:left="16dp"
        android:right="16dp" />

</layer-list>

Code

val itemDecoration = DividerItemDecoration(context, DividerItemDecoration.VERTICAL)
itemDecoration.setDrawable(resources.getDrawable(R.drawable.layer, null))
recyclerView.addItemDecoration(itemDecoration)

Solution 3:

Use this and customize according to your requirement.

public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private static final int[] ATTRS = new int[]{android.R.attr.listDivider};

    private Drawable divider;

    /**
     * Default divider will be used
     */
    public DividerItemDecoration(Context context) {
        final TypedArray styledAttributes = context.obtainStyledAttributes(ATTRS);
        divider = styledAttributes.getDrawable(0);
        styledAttributes.recycle();
    }

    /**
     * Custom divider will be used
     */
    public DividerItemDecoration(Context context, int resId) {
        divider = ContextCompat.getDrawable(context, resId);
    }

    @Override
    public void onDraw(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 + divider.getIntrinsicHeight();

            divider.setBounds(left, top, right, bottom);
            divider.draw(c);
        }
    }
}

Solution 4:

You can create your own item decoration for recycler view. Here is code for the same.

public class SimpleItemDecorator extends RecyclerView.ItemDecoration {

    int space;
    boolean isHorizontalLayout;
    public SimpleItemDecorator(int space) {
        this.space = space;
    }

    public SimpleItemDecorator(int space, boolean isHorizontalLayout) {
        this.space = space;
        this.isHorizontalLayout = isHorizontalLayout;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);
        if(isHorizontalLayout)
        {
            outRect.bottom=space;
            outRect.right=space;
            outRect.left=space;
            outRect.top=space;

        } else {
            outRect.bottom = space;
            if (parent.getChildAdapterPosition(view) == 0)
                outRect.top = space;
            else
                outRect.top = 0;

        }


    }
}

And to use it with your recyclerview you can do like this:

 recyclerView.addItemDecoration(new SimpleItemDecorator(5));

Solution 5:

Elaborating on @SeptimusX75: if you (like me) prefer to do UI stuff in XML you can create an inset drawable file. You'll have to create a second XML file but since in return your code gets cleaner I say it's worth it :-).

divider_base.xml (the actual divider):

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <size android:height="1dp" />
    <solid android:color="@color/dividerColor" />
</shape>

divider.xml (the inset):

<inset xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/divider_base"
    android:insetRight="20dp"
    android:insetLeft="20dp">
</inset>