feat: add multi activity example for rebind

Author: matinzd

packages/react-native/ReactCommon/react/nativemodule/samples/platform/android/SampleTurboModule.kt

@@ -374,6 +374,30 @@ public class SampleTurboModule(private val context: ReactApplicationContext) :
         PickUpToMedia.Request(limit, PickVisualMediaRequest(visualMediaType(mimeType))))
   }
 
+  /**
+   * Starts a second, distinct Activity in the same task to exercise multi-Activity navigation.
+   * With two ReactActivities alive, the new one resumes *before* the old one is destroyed, and the
+   * old one's onHostDestroy is dropped entirely -- the exact ordering that forces
+   * [com.facebook.react.activityresult.ReactActivityResultCallerImpl] to rebind launchers to the
+   * current Activity's registry instead of staying attached to the previous (still-alive or dead)
+   * one. Launched by class name so this sample module needs no compile-time dependency on the app.
+   */
+  @DoNotStrip
+  @Suppress("unused")
+  override fun startSecondActivity() {
+    val activity = context.currentActivity
+    if (activity == null) {
+      Toast.makeText(context, "No current Activity to launch from", Toast.LENGTH_LONG).show()
+      return
+    }
+    // The data URI deep-links the new surface straight to the picker example via Linking; the
+    // explicit class name keeps this an in-app navigation regardless of intent filters.
+    val intent =
+        Intent(Intent.ACTION_VIEW, Uri.parse("rntester://example/PhotoPickerAndroid"))
+            .setClassName(activity, "${activity.packageName}.RNTesterSecondActivity")
+    activity.startActivity(intent)
+  }
+
   private fun log(method: String, input: Any?, output: Any?) {
     toast?.cancel()
     val message = StringBuilder("Method :")

packages/react-native/src/private/specs_DEPRECATED/modules/NativeSampleTurboModule.js

@@ -71,6 +71,7 @@ export interface Spec extends TurboModule {
     mimeType: ?string,
     maxItems: number,
   ) => Promise<Array<string>>;
+  readonly startSecondActivity?: () => void;
 }
 
 export default TurboModuleRegistry.getEnforcing<Spec>(

packages/rn-tester/android/app/src/main/AndroidManifest.xml

@@ -89,6 +89,16 @@
             </intent-filter>
         </activity>
 
+        <!-- Second ReactActivity used by the PhotoPickerAndroid example to exercise
+             multi-Activity navigation with ActivityResultContract launchers: starting it on top
+             of RNTesterActivity forces the launchers to rebind to this Activity's registry. -->
+        <activity
+            android:name=".RNTesterSecondActivity"
+            android:configChanges="orientation|screenSize|uiMode|fontScale"
+            android:exported="false"
+            android:label="@string/app_name"
+            android:screenOrientation="fullSensor" />
+
         <provider
             android:name="com.facebook.react.modules.blob.BlobProvider"
             android:authorities="@string/blob_provider_authority"

packages/rn-tester/android/app/src/main/java/com/facebook/react/uiapp/RNTesterActivity.kt

@@ -22,7 +22,7 @@ import com.facebook.react.devsupport.DevMenuConfiguration
 import java.io.FileDescriptor
 import java.io.PrintWriter
 
-internal class RNTesterActivity : ReactActivity() {
+internal open class RNTesterActivity : ReactActivity() {
   class RNTesterActivityDelegate(val activity: ReactActivity, mainComponentName: String) :
       DefaultReactActivityDelegate(activity, mainComponentName) {
     private val PARAM_ROUTE = "route"

packages/rn-tester/android/app/src/main/java/com/facebook/react/uiapp/RNTesterSecondActivity.kt

@@ -0,0 +1,20 @@
+/*
+ * 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.uiapp
+
+/**
+ * A second ReactActivity, distinct from [RNTesterActivity], used to exercise multi-Activity
+ * navigation against ActivityResultContract launchers registered on the ReactContext (see
+ * SampleTurboModule.startSecondActivity and com.facebook.react.activityresult).
+ *
+ * When this Activity starts on top of [RNTesterActivity], its onHostResume fires while the first
+ * Activity is still alive, so the launchers must rebind to this Activity's
+ * ActivityResultRegistry -- a launch from here must dispatch from and deliver its result to *this*
+ * Activity, not the one the launchers were first bound to.
+ */
+internal class RNTesterSecondActivity : RNTesterActivity()

packages/rn-tester/js/examples/PhotoPickerAndroid/PhotoPickerAndroid.js

@@ -113,6 +113,32 @@ const PhotoPickerMultiple = (): React.Node => {
   );
 };
 
+/**
+ * Regression check for multi-Activity navigation: the launchers above were
+ * registered against the ReactContext and first bound to the Activity that
+ * started the app. Opening the second Activity (which resumes while the first
+ * one is still alive) must rebind them to the new Activity's registry — the
+ * pickers on the newly opened screen should open from and deliver their
+ * results to that screen. Going back and picking again checks rebinding in
+ * the other direction.
+ */
+const MultiActivity = (): React.Node => {
+  return (
+    <>
+      <RNTesterText style={styles.uriText}>
+        Opens this same example in a second Activity. Pick an image there — the
+        result must arrive on that screen. Then go back and pick here again.
+      </RNTesterText>
+      <View style={styles.row}>
+        <PickerButton
+          label="Open in a second Activity"
+          onPress={() => getNativeSampleTurboModule().startSecondActivity?.()}
+        />
+      </View>
+    </>
+  );
+};
+
 function PickerButton(props: {label: string, onPress: () => unknown}) {
   return (
     <TouchableOpacity onPress={props.onPress} style={styles.buttonContainer}>
@@ -135,6 +161,9 @@ class PhotoPickerAndroidExample extends React.Component<{}, {}> {
             <RNTesterBlock title="Multi select (JS-controlled limit)">
               <PhotoPickerMultiple />
             </RNTesterBlock>
+            <RNTesterBlock title="Multi-Activity navigation">
+              <MultiActivity />
+            </RNTesterBlock>
           </>
         )}
       </RNTesterPage>