[M3][Color] Color Component demo update

PiperOrigin-RevId: 518320238

Author: Material Design Team

catalog/java/io/material/catalog/color/ColorsFragment.java

@@ -21,6 +21,7 @@
 import android.content.Intent;
 import androidx.fragment.app.Fragment;
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import com.google.android.material.color.DynamicColors;
 import com.google.android.material.color.HarmonizedColors;
 import dagger.Provides;
@@ -58,6 +59,16 @@ public Fragment createFragment() {
     };
   }
 
+  @Nullable
+  public Demo getColorHarmonizationDemo() {
+    return new Demo(R.string.cat_color_harmonization) {
+      @Override
+      public Intent createActivityIntent() {
+        return new Intent(getContext(), ColorHarmonizationDemoActivity.class);
+      }
+    };
+  }
+
   @NonNull
   @Override
   public List<Demo> getAdditionalDemos() {
@@ -71,14 +82,8 @@ public Fragment createFragment() {
             }
           });
     }
-    if (HarmonizedColors.isHarmonizedColorAvailable()) {
-      additionalDemos.add(
-          new Demo(R.string.cat_color_harmonization) {
-            @Override
-            public Intent createActivityIntent() {
-              return new Intent(getContext(), ColorHarmonizationDemoActivity.class);
-            }
-          });
+    if (HarmonizedColors.isHarmonizedColorAvailable() && getColorHarmonizationDemo() != null) {
+      additionalDemos.add(getColorHarmonizationDemo());
     }
     return additionalDemos;
   }