Added RecyclerViewVerticalGapItemDecoration.

Author: adil-hussain-84

library/src/main/java/com/tazkiyatech/utils/views/RecyclerViewVerticalGapItemDecoration.java

@@ -0,0 +1,46 @@
+package com.tazkiyatech.utils.views;
+
+import android.graphics.Rect;
+import android.view.View;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+
+/**
+ * An extension of {@link RecyclerView.ItemDecoration} that
+ * draws a vertical gap between each item in a {@link RecyclerView}.
+ * <p>
+ * Unlike the {@link androidx.recyclerview.widget.DividerItemDecoration} class offered by the
+ * <a href="https://maven.google.com/web/index.html#androidx.recyclerview:recyclerview">recyclerview</a>
+ * library, this class does not draw a vertical gap under the final item in the {@link RecyclerView}.
+ * <p>
+ * See <a href="https://stackoverflow.com/a/27037230/1071320">this answer</a> in Stack Overflow
+ * for a better understanding of {@link RecyclerView.ItemDecoration}.
+ */
+public class RecyclerViewVerticalGapItemDecoration extends RecyclerView.ItemDecoration {
+
+    private final int verticalGapInPixels;
+
+    /**
+     * Constructor.
+     *
+     * @param verticalGapInPixels The height of the vertical gap (in pixels).
+     */
+    public RecyclerViewVerticalGapItemDecoration(int verticalGapInPixels) {
+        this.verticalGapInPixels = verticalGapInPixels;
+    }
+
+    @Override
+    public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
+        RecyclerView.Adapter<?> adapter = parent.getAdapter();
+        int itemCount = adapter != null ? adapter.getItemCount() : 0;
+
+        int itemPosition = parent.getChildLayoutPosition(view);
+
+        if (itemPosition + 1 < itemCount) {
+            outRect.set(0, 0, 0, verticalGapInPixels);
+        } else { // this is the last item in the RecyclerView so don't add vertical space underneath it
+            outRect.set(0, 0, 0, 0);
+        }
+    }
+}