Force relayout when wallpaper engine become visible.

After 9118c9b the surface can be destroy after the window state become
invisible, since WallpaperService copy the surface from WMS and it is
not implement with ViewRootImpl, WallpaperService#Engine should call
relayout to get new surface when client need to redraw it.

Bug: 158955956
Test: verify the wallpaper can show by launch LiveWallpaperChange with
live wallpaper and push/pull it from recents several times.
Test: atest WallpaperServiceTest ImageWallpaperTest

Change-Id: I79f97df61696eea325183e9b9057cbb10ce8cc66

1 files changed, 2 insertions, 1 deletions

diff --git a/core/java/android/service/wallpaper/WallpaperService.java b/core/java/android/service/wallpaper/WallpaperService.java
index f944dd78dc3d..0d420c5936ae 100644
--- a/core/java/android/service/wallpaper/WallpaperService.java
+++ b/core/java/android/service/wallpaper/WallpaperService.java
@@ -1184,7 +1184,8 @@ public abstract class WallpaperService extends Service {
                         // may have been destroyed so now we need to make
                         // sure it is re-created.
                         doOffsetsChanged(false);
-                        updateSurface(false, false, false);
+                        // force relayout to get new surface
+                        updateSurface(true, false, false);
                     }
                     onVisibilityChanged(visible);
                 }