Fixed battery percentage not animating when showing/hiding

Add layout transition animation

Fixed: 123362236
Test: manual - turn on/off show battery percentage in settings and go to
AOD

Change-Id: Ie98434e565d23461d82729d582f8ff4e63d8ac88

1 files changed, 19 insertions, 0 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/BatteryMeterView.java b/packages/SystemUI/src/com/android/systemui/BatteryMeterView.java
index 39a584272585..62b0542bd7fe 100644
--- a/packages/SystemUI/src/com/android/systemui/BatteryMeterView.java
+++ b/packages/SystemUI/src/com/android/systemui/BatteryMeterView.java
@@ -24,6 +24,8 @@ import static com.android.systemui.util.SysuiLifecycle.viewAttachLifecycle;
 import static java.lang.annotation.RetentionPolicy.SOURCE;
 
 import android.animation.ArgbEvaluator;
+import android.animation.LayoutTransition;
+import android.animation.ObjectAnimator;
 import android.annotation.IntDef;
 import android.app.ActivityManager;
 import android.content.Context;
@@ -141,6 +143,8 @@ public class BatteryMeterView extends LinearLayout implements
         addOnAttachStateChangeListener(
                 new DisableStateTracker(DISABLE_NONE, DISABLE2_SYSTEM_ICONS));
 
+        setupLayoutTransition();
+
         mSlotBattery = context.getString(
                 com.android.internal.R.string.status_bar_battery);
         mBatteryIconView = new ImageView(context);
@@ -178,6 +182,21 @@ public class BatteryMeterView extends LinearLayout implements
         setLayerType(LAYER_TYPE_SOFTWARE, null);
     }
 
+    private void setupLayoutTransition() {
+        LayoutTransition transition = new LayoutTransition();
+        transition.setDuration(200);
+
+        ObjectAnimator appearAnimator = ObjectAnimator.ofFloat(null, "alpha", 0f, 1f);
+        transition.setAnimator(LayoutTransition.APPEARING, appearAnimator);
+        transition.setInterpolator(LayoutTransition.APPEARING, Interpolators.ALPHA_IN);
+
+        ObjectAnimator disappearAnimator = ObjectAnimator.ofFloat(null, "alpha", 1f, 0f);
+        transition.setInterpolator(LayoutTransition.DISAPPEARING, Interpolators.ALPHA_OUT);
+        transition.setAnimator(LayoutTransition.DISAPPEARING, disappearAnimator);
+
+        setLayoutTransition(transition);
+    }
+
     public void setForceShowPercent(boolean show) {
         setPercentShowMode(show ? MODE_ON : MODE_DEFAULT);
     }