Customize Item callbacks and support existing background in

RecycleItemAdapter

- Added support for custom backgrounds in RecyclerItemAdapter.
- Added callbacks in Item to allow overriding state/level
  that gets copied from icon to drawable

Test: Tests added, verified that changes work
Change-Id: I33c883e0a1a0b76ccccaf8a61ab0bb49f46da3fb

1 files changed, 11 insertions, 2 deletions

diff --git a/library/main/src/com/android/setupwizardlib/items/Item.java b/library/main/src/com/android/setupwizardlib/items/Item.java
index 59ab1a1..fc8823e 100644
--- a/library/main/src/com/android/setupwizardlib/items/Item.java
+++ b/library/main/src/com/android/setupwizardlib/items/Item.java
@@ -155,8 +155,7 @@ public class Item extends AbstractItem {
             // Set the image drawable to null before setting the state and level to avoid affecting
             // any recycled drawable in the ImageView
             iconView.setImageDrawable(null);
-            iconView.setImageState(icon.getState(), false /* merge */);
-            iconView.setImageLevel(icon.getLevel());
+            onMergeIconStateAndLevels(iconView, icon);
             iconView.setImageDrawable(icon);
             iconContainer.setVisibility(View.VISIBLE);
         } else {
@@ -165,4 +164,14 @@ public class Item extends AbstractItem {
 
         view.setId(getViewId());
     }
+
+    /**
+     * Copies state and level information from {@link #getIcon()} to the currently bound view's
+     * ImageView. Subclasses can override this method to change whats being copied from the icon
+     * to the ImageView.
+     */
+    protected void onMergeIconStateAndLevels(ImageView iconView, Drawable icon) {
+        iconView.setImageState(icon.getState(), false /* merge */);
+        iconView.setImageLevel(icon.getLevel());
+    }
 }