Refine password disappear animation.

In the disappear animation, tie alpha of the view to animated value.
Before this fix, the view alpha is 1 until the animation is complete and
looks janky.

Fixes: 284436144
Test: unlock password with swipe up.
Test: unlock password with tap on notificaiton.
Test: unlock password with tap on settings from QS.
Change-Id: Ide0e632df5f4f32ecdb5ab27d4435f3e3785eecc
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardPasswordView.java b/packages/SystemUI/src/com/android/keyguard/KeyguardPasswordView.java
index 03d9eb3..a9910a1 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardPasswordView.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardPasswordView.java
@@ -189,17 +189,18 @@
                             if (controller.isCancelled()) {
                                 return;
                             }
+                            float value = (float) animation.getAnimatedValue();
+                            float fraction = anim.getAnimatedFraction();
                             Insets shownInsets = controller.getShownStateInsets();
                             int dist = (int) (-shownInsets.bottom / 4
-                                    * anim.getAnimatedFraction());
+                                    * fraction);
                             Insets insets = Insets.add(shownInsets, Insets.of(0, 0, 0, dist));
                             if (mDisappearAnimationListener != null) {
                                 mDisappearAnimationListener.setTranslationY(-dist);
                             }
 
-                            controller.setInsetsAndAlpha(insets,
-                                    (float) animation.getAnimatedValue(),
-                                    anim.getAnimatedFraction());
+                            controller.setInsetsAndAlpha(insets, value, fraction);
+                            setAlpha(value);
                         });
                         anim.addListener(new AnimatorListenerAdapter() {
                             @Override