Android UI - Icon Drawables

pre-review-checklist.md

@@ -1,3 +1,5 @@
+## Java
+
 #### Thread safety
 * Classes should be immutable where possible
 * Classes that may be used by multiple threads must be thread-safe
@@ -31,3 +33,13 @@
 * Use dedicated lock objects rather than `synchronized`
 * Don't call into other classes while holding locks
 * Don't start database transactions while holding locks
+
+## Android UI
+
+#### Icon Drawables
+
+* Use `app:srcCompat` instead of `android:src` to define drawables in XML files
+* Use `setImageResource()` to set icons instead of `setImageDrawable()`
+* If you need to set a drawable directly, but can't use `setImageResource()`, use `VectorDrawableCompat.create()` to get the drawable
+* Don't use vector(-only) drawables for notification icons (unless that's supported now)
+* Test icon display on API < 21