Fix UI disordered when starting activity in background

ViewPager can't get its actual height when updating in background.
Call super.onMeasure() at first to retrive child count and then call
setMeasuredDimension().

Bug: 135406087
Test: Manual test
Change-Id: I58430d01b324785d9d6f900d31791abf67ebceb2

1 files changed, 3 insertions, 4 deletions

diff --git a/src/com/android/wallpaper/livepicker/widget/ConstraintViewPager.java b/src/com/android/wallpaper/livepicker/widget/ConstraintViewPager.java
index 985cad6..f59b0b9 100644
--- a/src/com/android/wallpaper/livepicker/widget/ConstraintViewPager.java
+++ b/src/com/android/wallpaper/livepicker/widget/ConstraintViewPager.java
@@ -50,6 +50,8 @@ public class ConstraintViewPager extends ViewPager {
      */
     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+
         int maxChildHeight = 0;
         int infoChildHeight = 0;
         int infoTopPadding = 0;
@@ -81,9 +83,6 @@ public class ConstraintViewPager extends ViewPager {
             }
         }
 
-        if (maxChildHeight != 0) {
-            heightMeasureSpec = MeasureSpec.makeMeasureSpec(maxChildHeight, MeasureSpec.EXACTLY);
-        }
-        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec), maxChildHeight);
     }
 }