diff --git a/java/res/values/styles.xml b/java/res/values/styles.xml
index 436e080f7..dad7e2064 100644
--- a/java/res/values/styles.xml
+++ b/java/res/values/styles.xml
@@ -94,8 +94,10 @@
         <item name="showMoreKeysKeyboardAtTouchedPoint">@bool/config_show_more_keys_keyboard_at_touched_point</item>
         <item name="languageOnSpacebarFinalAlpha">@integer/config_language_on_spacebar_final_alpha</item>
         <item name="languageOnSpacebarFadeoutAnimator">@anim/language_on_spacebar_fadeout</item>
+        <!-- Remove animations for now because it could drain a non-negligible amount of battery while typing.
         <item name="altCodeKeyWhileTypingFadeoutAnimator">@anim/alt_code_key_while_typing_fadeout</item>
         <item name="altCodeKeyWhileTypingFadeinAnimator">@anim/alt_code_key_while_typing_fadein</item>
+        -->
         <!-- Common attributes of MainKeyboardView for gesture typing detection and recognition -->
         <item name="gestureFloatingPreviewTextLingerTimeout">@integer/config_gesture_floating_preview_text_linger_timeout</item>
         <item name="gestureStaticTimeThresholdAfterFastTyping">@integer/config_gesture_static_time_threshold_after_fast_typing</item>
diff --git a/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java b/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
index 454469ce7..8d4beeced 100644
--- a/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
@@ -333,6 +333,10 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
 
         private static void cancelAndStartAnimators(final ObjectAnimator animatorToCancel,
                 final ObjectAnimator animatorToStart) {
+            if (animatorToCancel == null || animatorToStart == null) {
+                // TODO: Stop using null as a no-operation animator.
+                return;
+            }
             float startFraction = 0.0f;
             if (animatorToCancel.isStarted()) {
                 animatorToCancel.cancel();
@@ -581,6 +585,7 @@ public final class MainKeyboardView extends KeyboardView implements PointerTrack
 
     private ObjectAnimator loadObjectAnimator(final int resId, final Object target) {
         if (resId == 0) {
+            // TODO: Stop returning null.
             return null;
         }
         final ObjectAnimator animator = (ObjectAnimator)AnimatorInflater.loadAnimator(