From 0405d39ffbbc821ee74e99cabf6c746ef8b820f7 Mon Sep 17 00:00:00 2001
From: Majed DH <freedoumanian@gmail.com>
Date: Sun, 7 Apr 2019 21:51:20 +0300
Subject: [PATCH] fix IllegalStateException when view is not attached.

---
 .../materialshowcaseview/MaterialShowcaseView.java     | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/library/src/main/java/uk/co/deanwild/materialshowcaseview/MaterialShowcaseView.java b/library/src/main/java/uk/co/deanwild/materialshowcaseview/MaterialShowcaseView.java
index 99fc13d2..a8761645 100644
--- a/library/src/main/java/uk/co/deanwild/materialshowcaseview/MaterialShowcaseView.java
+++ b/library/src/main/java/uk/co/deanwild/materialshowcaseview/MaterialShowcaseView.java
@@ -992,8 +992,14 @@ public boolean show(final Activity activity) {
         mHandler.postDelayed(new Runnable() {
             @Override
             public void run() {
-
-                if (mShouldAnimate) {
+                boolean attached;
+                // taken from https://android.googlesource.com/platform/frameworks/support/+/refs/heads/androidx-master-dev/core/src/main/java/androidx/core/view/ViewCompat.java#3310
+                if (Build.VERSION.SDK_INT >= 19) {
+                    attached = isAttachedToWindow();
+                } else {
+                    attached = getWindowToken() != null;
+                }
+                if (mShouldAnimate && attached) {
                     fadeIn();
                 } else {
                     setVisibility(VISIBLE);