Align info and setting tab to the same height

It will feel tab jumping while switching to different tab, which causes
from info tab and customize tab's height are not the same.

Visit all child views first and then determine the maximum height for
ViewPager.

Bug: 126301901
Test: Manual Test

Change-Id: Iada213a96622179b201a96b36ee551c6732dd5cc

1 files changed, 13 insertions, 9 deletions

diff --git a/src/com/android/wallpaper/livepicker/widget/ConstraintViewPager.java b/src/com/android/wallpaper/livepicker/widget/ConstraintViewPager.java
index 8948bb4..c4dcf09 100644
--- a/src/com/android/wallpaper/livepicker/widget/ConstraintViewPager.java
+++ b/src/com/android/wallpaper/livepicker/widget/ConstraintViewPager.java
@@ -25,8 +25,8 @@ import androidx.annotation.Nullable;
 import androidx.viewpager.widget.ViewPager;
 
 /**
- * When ConstraintViewPager is being measured, it will calculate height of the currently selected
- * page and makes itself be the same height exactly.
+ * When ConstraintViewPager is being measured, it will get all height of pages and makes itself
+ * height as the same as the maximum height.
  */
 public class ConstraintViewPager extends ViewPager {
 
@@ -39,20 +39,24 @@ public class ConstraintViewPager extends ViewPager {
     }
 
     /**
-     * Calculates the measured height of the selected page and makes itself be the same height.
+     * Visit all child views first and then determine the maximum height for ViewPager.
      */
     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        final View pageView = getChildAt(getCurrentItem());
-        if (pageView != null) {
-            pageView.measure(widthMeasureSpec,
+        int maxChildHeight = 0;
+        for (int i = 0; i < getChildCount(); i++) {
+            View view = getChildAt(i);
+            view.measure(widthMeasureSpec,
                     MeasureSpec.makeMeasureSpec(0 /* size */, MeasureSpec.UNSPECIFIED));
-            if (pageView.getMeasuredHeight() != 0) {
-                heightMeasureSpec = MeasureSpec.makeMeasureSpec(pageView.getMeasuredHeight(),
-                        MeasureSpec.EXACTLY);
+            int childHeight = view.getMeasuredHeight();
+            if (childHeight > maxChildHeight) {
+                maxChildHeight = childHeight;
             }
         }
 
+        if (maxChildHeight != 0) {
+            heightMeasureSpec = MeasureSpec.makeMeasureSpec(maxChildHeight, MeasureSpec.EXACTLY);
+        }
         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     }
 }