Improve javadoc

Author: amlcurran

library/src/main/java/com/github/amlcurran/showcaseview/ShowcaseView.java

@@ -421,16 +421,30 @@ public ShowcaseView build() {
          * <img alt="Holo showcase example" src="../../../../../../../../example2.png" />
          */
         public Builder withHoloShowcase() {
-            showcaseView.setShowcaseDrawer(new StandardShowcaseDrawer(activity.getResources()));
-            return this;
+            return setShowcaseDrawer(new StandardShowcaseDrawer(activity.getResources()));
         }
 
         /**
          * Draw a new-style showcase.<br/>
          * <img alt="Holo showcase example" src="../../../../../../../../example.png" />
          */
         public Builder withNewStyleShowcase() {
-            showcaseView.setShowcaseDrawer(new NewShowcaseDrawer(activity.getResources()));
+            return setShowcaseDrawer(new NewShowcaseDrawer(activity.getResources()));
+        }
+
+        /**
+         * Draw a material style showcase.
+         * <img alt="Material showcase" src="../../../../../../../../material.png" />
+         */
+        public Builder withMaterialShowcase() {
+            return setShowcaseDrawer(new MaterialShowcaseDrawer(activity.getResources()));
+        }
+
+        /**
+         * Set a custom showcase drawer which will be responsible for measuring and drawing the showcase
+         */
+        public Builder setShowcaseDrawer(ShowcaseDrawer showcaseDrawer) {
+            showcaseView.setShowcaseDrawer(showcaseDrawer);
             return this;
         }
 
@@ -549,16 +563,6 @@ public Builder setContentTitlePaint(TextPaint textPaint) {
             showcaseView.setContentTitlePaint(textPaint);
             return this;
         }
-
-        public Builder setShowcaseDrawer(ShowcaseDrawer showcaseDrawer) {
-            showcaseView.setShowcaseDrawer(showcaseDrawer);
-            return this;
-        }
-
-        public Builder withMaterialShowcase() {
-            showcaseView.setShowcaseDrawer(new MaterialShowcaseDrawer(activity.getResources()));
-            return this;
-        }
     }
 
     private void setShowcaseDrawer(ShowcaseDrawer showcaseDrawer) {