patch ReactModalHostview to init with correct sizes

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/modal/ReactModalHostView.kt

@@ -27,8 +27,11 @@ import android.view.accessibility.AccessibilityEvent
 import android.view.accessibility.AccessibilityNodeInfo
 import android.widget.FrameLayout
 import androidx.annotation.UiThread
+import androidx.core.view.ViewCompat
 import androidx.core.content.ContextCompat
 import androidx.core.view.WindowCompat
+import androidx.core.view.WindowInsetsCompat
+import androidx.core.view.WindowInsetsCompat.CONSUMED
 import com.facebook.common.logging.FLog
 import com.facebook.react.R
 import com.facebook.react.bridge.GuardedRunnable
@@ -40,6 +43,7 @@ import com.facebook.react.bridge.WritableNativeMap
 import com.facebook.react.common.ReactConstants
 import com.facebook.react.common.annotations.VisibleForTesting
 import com.facebook.react.config.ReactFeatureFlags
+import com.facebook.react.uimanager.DisplayMetricsHolder
 import com.facebook.react.uimanager.JSPointerDispatcher
 import com.facebook.react.uimanager.JSTouchDispatcher
 import com.facebook.react.uimanager.PixelUtil.pxToDp
@@ -52,6 +56,7 @@ import com.facebook.react.views.common.ContextUtils
 import com.facebook.react.views.view.ReactViewGroup
 import com.facebook.react.views.view.setStatusBarTranslucency
 import com.facebook.react.views.view.setSystemBarsTranslucency
+import com.facebook.yoga.annotations.DoNotStrip
 import java.util.Objects
 
 /**
@@ -122,6 +127,7 @@ public class ReactModalHostView(context: ThemedReactContext) :
   private var createNewDialog = false
 
   init {
+    initStatusBarHeight(context)
     dialogRootViewGroup = DialogRootViewGroup(context)
   }
 
@@ -412,6 +418,18 @@ public class ReactModalHostView(context: ThemedReactContext) :
     }
   }
 
+  private fun initStatusBarHeight(reactContext: ReactContext) {
+    val windowInsets =
+        reactContext.getCurrentActivity()?.window?.decorView?.let(ViewCompat::getRootWindowInsets)
+    statusBarHeight =
+        windowInsets
+            ?.getInsets(
+                WindowInsetsCompat.Type.statusBars() or
+                    WindowInsetsCompat.Type.navigationBars() or
+                    WindowInsetsCompat.Type.displayCutout())
+            ?.top ?: 0
+  }
+
   /**
    * Sets the testID on the DialogRootViewGroup. Since the accessibility events are not triggered on
    * the on the ReactModalHostView, the testID is forwarded to the DialogRootViewGroup to set the
@@ -430,8 +448,22 @@ public class ReactModalHostView(context: ThemedReactContext) :
 
   private companion object {
     private const val TAG = "ReactModalHost"
+
+    // We store the status bar height to be able to properly position
+    // the modal on the first render.
+    private var statusBarHeight = 0
+
+    @JvmStatic
+    @DoNotStrip
+    private fun getScreenDisplayMetricsWithoutInsets(): FloatArray {
+      val displayMetrics = DisplayMetricsHolder.getScreenDisplayMetrics()
+      return floatArrayOf(
+          displayMetrics.widthPixels.toFloat().pxToDp(),
+          (displayMetrics.heightPixels - statusBarHeight).toFloat().pxToDp())
+    }
   }
 
+
   /**
    * DialogRootViewGroup is the ViewGroup which contains all the children of a Modal. It gets all
    * child information forwarded from [ReactModalHostView] and uses that to create children. It is
@@ -568,3 +600,4 @@ public class ReactModalHostView(context: ThemedReactContext) :
     }
   }
 }
+

packages/react-native/ReactCommon/react/renderer/components/modal/CMakeLists.txt

@@ -14,7 +14,10 @@ add_compile_options(
         -Wpedantic
         -DLOG_TAG=\"Fabric\")
 
-file(GLOB rrc_modal_SRC CONFIGURE_DEPENDS *.cpp)
+file(GLOB rrc_modal_SRC CONFIGURE_DEPENDS
+        *.cpp
+        platform/android/*.cpp)
+
 add_library(rrc_modal STATIC ${rrc_modal_SRC})
 
 target_include_directories(rrc_modal PUBLIC ${REACT_COMMON_DIR})

packages/react-native/ReactCommon/react/renderer/components/modal/ModalHostViewState.h

@@ -9,14 +9,13 @@
 
 #include <react/renderer/core/graphicsConversions.h>
 #include <react/renderer/graphics/Float.h>
+#include "ModalHostViewUtils.h"
 
 #ifdef ANDROID
 #include <folly/dynamic.h>
 #endif
 
-#if defined(__APPLE__) && TARGET_OS_IOS
 #include "ModalHostViewUtils.h"
-#endif
 
 namespace facebook::react {
 
@@ -27,12 +26,7 @@ class ModalHostViewState final {
  public:
   using Shared = std::shared_ptr<const ModalHostViewState>;
 
-#if defined(__APPLE__) && TARGET_OS_IOS
-  ModalHostViewState() : screenSize(RCTModalHostViewScreenSize()) {
-#else
-  ModalHostViewState(){
-#endif
-  };
+  ModalHostViewState() : screenSize(RCTModalHostViewScreenSize()) {}
   ModalHostViewState(Size screenSize_) : screenSize(screenSize_){};
 
 #ifdef ANDROID
@@ -54,3 +48,4 @@ class ModalHostViewState final {
 };
 
 } // namespace facebook::react
+

packages/react-native/ReactCommon/react/renderer/components/modal/ModalHostViewUtils.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/renderer/core/graphicsConversions.h>
+#include <react/renderer/graphics/Size.h>
 
 namespace facebook::react {
 

packages/react-native/ReactCommon/react/renderer/components/modal/platform/android/JReactModalHostView.h

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <fbjni/fbjni.h>
+#include <react/renderer/graphics/Size.h>
+
+#include <android/log.h>
+
+namespace facebook::react {
+
+class JReactModalHostView
+    : public facebook::jni::JavaClass<JReactModalHostView> {
+ public:
+  static auto constexpr kJavaDescriptor =
+      "Lcom/facebook/react/views/modal/ReactModalHostView;";
+
+  static Size getDisplayMetrics() {
+    static auto method = JReactModalHostView::javaClassStatic()
+                             ->getStaticMethod<jni::JArrayFloat()>(
+                                 "getScreenDisplayMetricsWithoutInsets");
+    auto result = method(javaClassStatic());
+    size_t size = result->size();
+    std::vector<jfloat> elements(size + 1L);
+    result->getRegion(0, size, elements.data());
+    return Size{elements[0], elements[1]};
+  }
+};
+
+} // namespace facebook::react

packages/react-native/ReactCommon/react/renderer/components/modal/platform/android/ModalHostViewUtils.cpp

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include <react/renderer/components/modal/ModalHostViewUtils.h>
+#include "JReactModalHostView.h"
+
+namespace facebook::react {
+
+Size RCTModalHostViewScreenSize(void) {
+  return JReactModalHostView::getDisplayMetrics();
+}
+
+} // namespace facebook::react