From 5cdab30947fbdbbbc23a9180e6c222ce08c32be7 Mon Sep 17 00:00:00 2001
From: fabriziobertoglio1987 <fabrizio.bertoglio@gmail.com>
Date: Tue, 9 Feb 2021 12:03:12 +0100
Subject: [PATCH] compute correct Keyboard Height with Notch

Without Notch
- DisplayMetricsHolder.getWindowDisplayMetrics().heightPixels is 1794
- mVisibleViewArea.bottom is 1794

**With Notch**
- DisplayMetricsHolder.getWindowDisplayMetrics().heightPixels is 1668
- mVisibleViewArea.bottom is 1794

Observations:
- getWindowVisibleDisplayFrame().heightPixels returns correct height for devices with Notch
- mVisibleViewArea.bottom does not take in consideration the notch (the
  value does not change)

Solution:
- Including the Notch Height in the Keyboard Height calculation

Clear Explanation at https://github.com/facebook/react-native/issues/27089#issuecomment-775821333

https://github.com/facebook/react-native/blob/d79212120b7168015d3d0225ef372ed851a230fa/ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java#L757-L758
---
 .../src/main/java/com/facebook/react/ReactRootView.java      | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java b/ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java
index 13074f8963e445..7f440be3e910e1 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java
@@ -25,6 +25,7 @@
 import android.view.ViewGroup;
 import android.view.ViewTreeObserver;
 import android.view.WindowManager;
+import android.view.DisplayCutout;
 import android.widget.FrameLayout;
 import androidx.annotation.Nullable;
 import com.facebook.common.logging.FLog;
@@ -766,8 +767,10 @@ public void onGlobalLayout() {
 
     private void checkForKeyboardEvents() {
       getRootView().getWindowVisibleDisplayFrame(mVisibleViewArea);
+      DisplayCutout displayCutout = getRootView().getRootWindowInsets().getDisplayCutout();
+      int notchHeight = displayCutout == null ? 0 : displayCutout.getSafeInsetTop();
       final int heightDiff =
-          DisplayMetricsHolder.getWindowDisplayMetrics().heightPixels - mVisibleViewArea.bottom;
+          DisplayMetricsHolder.getWindowDisplayMetrics().heightPixels - mVisibleViewArea.bottom + notchHeight;
 
       boolean isKeyboardShowingOrKeyboardHeightChanged =
           mKeyboardHeight != heightDiff && heightDiff > mMinKeyboardHeightDetected;