Back out "Migrate ReactActivity" (#50998)

Summary:
Pull Request resolved: #50998

I'm reverting this as this change is too disruptive for the OSS ecosystem.
It will break ALL the apps written in Kotlin and it's coming too close to the branch cut which is in less than one week.

We need to re-do this migration in a non breaking manner after the branch cut as this is highly disruptive for little benefit at this point

Changelog
[Android][Changed] - Back out "[RN][Kotlin] Migrate ReactActivity"

Original commit changeset: 936263100ca9

Original Phabricator Diff: D73507044

Reviewed By: mdvacca

Differential Revision: D73864144

fbshipit-source-id: 264921b1f1cd38301e66364de4b619807272bd27

Author: cortinico

packages/helloworld/android/app/src/main/java/com/helloworld/MainActivity.kt

@@ -18,8 +18,7 @@ class MainActivity : ReactActivity() {
    * Returns the name of the main component registered from JavaScript. This is used to schedule
    * rendering of the component.
    */
-  override val mainComponentName: String?
-    get() = "HelloWorld"
+  override fun getMainComponentName(): String = "HelloWorld"
 
   /**
    * Returns the instance of the [ReactActivityDelegate]. We use [DefaultReactActivityDelegate]

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactActivity.java

@@ -0,0 +1,162 @@
+/*
+ * 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.
+ */
+
+package com.facebook.react;
+
+import android.content.Intent;
+import android.content.res.Configuration;
+import android.os.Bundle;
+import android.view.KeyEvent;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;
+import com.facebook.react.modules.core.PermissionAwareActivity;
+import com.facebook.react.modules.core.PermissionListener;
+import org.jetbrains.annotations.NotNull;
+
+/** Base Activity for React Native applications. */
+public abstract class ReactActivity extends AppCompatActivity
+    implements DefaultHardwareBackBtnHandler, PermissionAwareActivity {
+
+  private final ReactActivityDelegate mDelegate;
+
+  protected ReactActivity() {
+    mDelegate = createReactActivityDelegate();
+  }
+
+  /**
+   * Returns the name of the main component registered from JavaScript. This is used to schedule
+   * rendering of the component. e.g. "MoviesApp"
+   */
+  protected @Nullable String getMainComponentName() {
+    return null;
+  }
+
+  /** Called at construction time, override if you have a custom delegate implementation. */
+  protected ReactActivityDelegate createReactActivityDelegate() {
+    return new ReactActivityDelegate(this, getMainComponentName());
+  }
+
+  @Override
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    mDelegate.onCreate(savedInstanceState);
+  }
+
+  @Override
+  protected void onPause() {
+    super.onPause();
+    mDelegate.onPause();
+  }
+
+  @Override
+  protected void onResume() {
+    super.onResume();
+    mDelegate.onResume();
+  }
+
+  @Override
+  protected void onDestroy() {
+    super.onDestroy();
+    mDelegate.onDestroy();
+  }
+
+  public @Nullable ReactDelegate getReactDelegate() {
+    return mDelegate.getReactDelegate();
+  }
+
+  public ReactActivityDelegate getReactActivityDelegate() {
+    return mDelegate;
+  }
+
+  @Override
+  public void onActivityResult(int requestCode, int resultCode, Intent data) {
+    super.onActivityResult(requestCode, resultCode, data);
+    mDelegate.onActivityResult(requestCode, resultCode, data);
+  }
+
+  @Override
+  public boolean onKeyDown(int keyCode, KeyEvent event) {
+    return mDelegate.onKeyDown(keyCode, event) || super.onKeyDown(keyCode, event);
+  }
+
+  @Override
+  public boolean onKeyUp(int keyCode, KeyEvent event) {
+    return mDelegate.onKeyUp(keyCode, event) || super.onKeyUp(keyCode, event);
+  }
+
+  @Override
+  public boolean onKeyLongPress(int keyCode, KeyEvent event) {
+    return mDelegate.onKeyLongPress(keyCode, event) || super.onKeyLongPress(keyCode, event);
+  }
+
+  @Override
+  public void onBackPressed() {
+    if (!mDelegate.onBackPressed()) {
+      super.onBackPressed();
+    }
+  }
+
+  @Override
+  public void invokeDefaultOnBackPressed() {
+    super.onBackPressed();
+  }
+
+  @Override
+  public void onNewIntent(Intent intent) {
+    if (!mDelegate.onNewIntent(intent)) {
+      super.onNewIntent(intent);
+    }
+  }
+
+  @Override
+  public void onUserLeaveHint() {
+    super.onUserLeaveHint();
+    mDelegate.onUserLeaveHint();
+  }
+
+  @Override
+  public void requestPermissions(
+      String[] permissions, int requestCode, PermissionListener listener) {
+    mDelegate.requestPermissions(permissions, requestCode, listener);
+  }
+
+  @Override
+  public void onRequestPermissionsResult(
+      int requestCode, @NotNull String[] permissions, @NotNull int[] grantResults) {
+    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+    mDelegate.onRequestPermissionsResult(requestCode, permissions, grantResults);
+  }
+
+  @Override
+  public void onWindowFocusChanged(boolean hasFocus) {
+    super.onWindowFocusChanged(hasFocus);
+    mDelegate.onWindowFocusChanged(hasFocus);
+  }
+
+  @Override
+  public void onConfigurationChanged(@NotNull Configuration newConfig) {
+    super.onConfigurationChanged(newConfig);
+    mDelegate.onConfigurationChanged(newConfig);
+  }
+
+  protected final ReactNativeHost getReactNativeHost() {
+    return mDelegate.getReactNativeHost();
+  }
+
+  protected ReactHost getReactHost() {
+    return mDelegate.getReactHost();
+  }
+
+  protected final ReactInstanceManager getReactInstanceManager() {
+    return mDelegate.getReactInstanceManager();
+  }
+
+  protected final void loadApp(String appKey) {
+    mDelegate.loadApp(appKey);
+  }
+}

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactActivity.kt

@@ -110,7 +110,7 @@ public ReactInstanceManager getReactInstanceManager() {
     return mReactDelegate.getReactInstanceManager();
   }
 
-  public @Nullable String getMainComponentName() {
+  public String getMainComponentName() {
     return mMainComponentName;
   }
 

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactActivityDelegate.java

@@ -21,7 +21,7 @@ import com.facebook.react.ReactActivityDelegate
  */
 public open class DefaultReactActivityDelegate(
     activity: ReactActivity,
-    mainComponentName: String?,
+    mainComponentName: String,
     private val fabricEnabled: Boolean = false,
 ) : ReactActivityDelegate(activity, mainComponentName) {
 

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/defaults/DefaultReactActivityDelegate.kt

@@ -22,7 +22,7 @@ import java.io.FileDescriptor
 import java.io.PrintWriter
 
 internal class RNTesterActivity : ReactActivity() {
-  class RNTesterActivityDelegate(val activity: ReactActivity, mainComponentName: String?) :
+  class RNTesterActivityDelegate(val activity: ReactActivity, mainComponentName: String) :
       DefaultReactActivityDelegate(activity, mainComponentName, fabricEnabled) {
     private val PARAM_ROUTE = "route"
     private lateinit var initialProps: Bundle
@@ -43,9 +43,6 @@ internal class RNTesterActivity : ReactActivity() {
         if (this::initialProps.isInitialized) initialProps else Bundle()
   }
 
-  override val mainComponentName: String?
-    get() = "RNTesterApp"
-
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
 
@@ -55,7 +52,7 @@ internal class RNTesterActivity : ReactActivity() {
     this.window?.setBackgroundDrawable(ColorDrawable(Color.BLACK))
     // register insets listener to update margins on the ReactRootView to avoid overlap w/ system
     // bars
-    reactDelegate?.getReactRootView()?.let { rootView ->
+    getReactDelegate()?.getReactRootView()?.let { rootView ->
       val insetsType: Int =
           WindowInsetsCompat.Type.systemBars() or WindowInsetsCompat.Type.displayCutout()
 
@@ -74,6 +71,8 @@ internal class RNTesterActivity : ReactActivity() {
 
   override fun createReactActivityDelegate() = RNTesterActivityDelegate(this, mainComponentName)
 
+  override fun getMainComponentName() = "RNTesterApp"
+
   override fun dump(
       prefix: String,
       fd: FileDescriptor?,