how to set equal margin between recyclerview items

Question

See this Image

I achieved the current margin from xml layout but its not same through all four sides.

How to get equal margin

My current xml layout

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="300dp">

<ImageView
    android:id="@+id/iv_photo"
    android:layout_width="match_parent"
    android:layout_height="300dp"
    android:layout_marginEnd="6dp"
    android:layout_marginTop="6dp"
    android:adjustViewBounds="true"
    android:background="@color/colorPrimary"
    android:foreground="?android:attr/selectableItemBackground"
    android:scaleType="fitXY" />

</RelativeLayout>

Answer 1

You can use ItemDecoration for this purpose

public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
  private int space;

  public SpacesItemDecoration(int space) {
    this.space = space;
  }

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

    // Add top margin only for the first item to avoid double space between items
    if (parent.getChildLayoutPosition(view) == 0) {
        outRect.top = space;
    } else {
        outRect.top = 0;
    }
  }
}

This is how you will use it in java code

mRecyclerView = (RecyclerView) rootView.findViewById(R.id.my_recycler_view);
int spacingInPixels = getResources().getDimensionPixelSize(R.dimen.spacing);
mRecyclerView.addItemDecoration(new SpacesItemDecoration(spacingInPixels));

This solution was provided by @ianhanniballake. Hope this will help you.