From 9073ef0a5eacdf820c45b9267396a5cd8c4b1e13 Mon Sep 17 00:00:00 2001
From: Fabian Kozynski <kozynski@google.com>
Date: Mon, 16 Mar 2020 11:50:12 -0400
Subject: [PATCH] Prevent NPE in PagedTileLayout

This CL prevents fake drag by checking ViewPager#isFakeDragging, which
is enabled by ViewPager#beginFakeDrag.

This is not a fix of the underlying issue (which is not known) but a
patch to prevent crashing.

Fixes: 149979063
Test: adb shell monkey --throttle 1000 --pct-nav 0 --pct-majornav 0 \
        --pct-touch 30 --ignore-crashes --ignore-timeouts \
        --ignore-security-exceptions -v 2000000
Change-Id: I7da764eaf20fc9d971afe2cb89b232b4efd65a3b
---
 .../SystemUI/src/com/android/systemui/qs/PagedTileLayout.java  | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/SystemUI/src/com/android/systemui/qs/PagedTileLayout.java b/packages/SystemUI/src/com/android/systemui/qs/PagedTileLayout.java
index 0403a0505b003..cd737217b84a1 100644
--- a/packages/SystemUI/src/com/android/systemui/qs/PagedTileLayout.java
+++ b/packages/SystemUI/src/com/android/systemui/qs/PagedTileLayout.java
@@ -142,6 +142,9 @@ public class PagedTileLayout extends ViewPager implements QSTileLayout {
     @Override
     public void computeScroll() {
         if (!mScroller.isFinished() && mScroller.computeScrollOffset()) {
+            if (!isFakeDragging()) {
+                beginFakeDrag();
+            }
             fakeDragBy(getScrollX() - mScroller.getCurrX());
             // Keep on drawing until the animation has finished.
             postInvalidateOnAnimation();