From 383934a06e22e8e1a5ee50d121722240259f95d0 Mon Sep 17 00:00:00 2001
From: Emily Janzer <janzer@fb.com>
Date: Wed, 22 Jan 2020 10:14:18 -0800
Subject: [PATCH] Don't emit dimensions update event on initial load

Summary: On iOS we don't emit the didUpdateDimensions event in JS when the first React Native screen is rendered, so let's keep the behavior the same on Android.

Reviewed By: mdvacca

Differential Revision: D19506829

fbshipit-source-id: d0122d18be79177318c3f059ed396f990eeabcb7
---
 .../facebook/react/modules/deviceinfo/DeviceInfoModule.java   | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/ReactAndroid/src/main/java/com/facebook/react/modules/deviceinfo/DeviceInfoModule.java b/ReactAndroid/src/main/java/com/facebook/react/modules/deviceinfo/DeviceInfoModule.java
index f8deb0e2e4e073..828f209cd76d16 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/modules/deviceinfo/DeviceInfoModule.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/modules/deviceinfo/DeviceInfoModule.java
@@ -89,7 +89,9 @@ public void emitUpdateDimensionsEvent() {
       // Don't emit an event to JS if the dimensions haven't changed
       WritableNativeMap displayMetrics =
           DisplayMetricsHolder.getDisplayMetricsNativeMap(mFontScale);
-      if (!displayMetrics.equals(mPreviousDisplayMetrics)) {
+      if (mPreviousDisplayMetrics == null) {
+        mPreviousDisplayMetrics = displayMetrics.copy();
+      } else if (!displayMetrics.equals(mPreviousDisplayMetrics)) {
         mPreviousDisplayMetrics = displayMetrics.copy();
         mReactApplicationContext
             .getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)