diff --git a/AnkiDroid/src/main/java/com/ichi2/anki/cardviewer/ViewerCommand.kt b/AnkiDroid/src/main/java/com/ichi2/anki/cardviewer/ViewerCommand.kt
index e8635969449f..32cdeb881f39 100644
--- a/AnkiDroid/src/main/java/com/ichi2/anki/cardviewer/ViewerCommand.kt
+++ b/AnkiDroid/src/main/java/com/ichi2/anki/cardviewer/ViewerCommand.kt
@@ -29,11 +29,12 @@ import com.ichi2.anki.reviewer.MappableBinding
 import com.ichi2.anki.reviewer.MappableBinding.Companion.fromPreference
 import com.ichi2.anki.reviewer.MappableBinding.Companion.toPreferenceString
 import com.ichi2.anki.reviewer.ReviewerBinding
+import com.ichi2.anki.reviewer.ScreenAction
 
 /** Abstraction: Discuss moving many of these to 'Reviewer'  */
 enum class ViewerCommand(
     val resourceId: Int,
-) {
+) : ScreenAction<ReviewerBinding> {
     SHOW_ANSWER(R.string.show_answer),
     FLIP_OR_ANSWER_EASE1(R.string.answer_again),
     FLIP_OR_ANSWER_EASE2(R.string.answer_hard),
@@ -134,6 +135,10 @@ enum class ViewerCommand(
         preferences.edit { putString(preferenceKey, newValue) }
     }
 
+    override fun getBindings(prefs: SharedPreferences): List<ReviewerBinding> {
+        TODO("Not yet implemented")
+    }
+
     // If we use the serialised format, then this adds additional coupling to the properties.
     val defaultValue: List<MappableBinding>
         get() {
diff --git a/AnkiDroid/src/main/java/com/ichi2/anki/reviewer/MappableBinding.kt b/AnkiDroid/src/main/java/com/ichi2/anki/reviewer/MappableBinding.kt
index 57dcb6fdc32a..91bbfbc69f5c 100644
--- a/AnkiDroid/src/main/java/com/ichi2/anki/reviewer/MappableBinding.kt
+++ b/AnkiDroid/src/main/java/com/ichi2/anki/reviewer/MappableBinding.kt
@@ -31,6 +31,14 @@ import com.ichi2.utils.hash
 import timber.log.Timber
 import java.util.Objects
 
+interface ScreenAction<B : MappableBinding> {
+    fun getBindings(prefs: SharedPreferences): List<B>
+}
+
+interface BindingProcessor<B : MappableBinding, A : ScreenAction<B>> {
+    fun executeAction(action: A)
+}
+
 /**
  * Binding + additional contextual information
  * Also defines equality over bindings.