diff --git a/packages/firebase_messaging/firebase_messaging/android/src/main/java/io/flutter/plugins/firebase/messaging/FlutterFirebaseMessagingReceiver.java b/packages/firebase_messaging/firebase_messaging/android/src/main/java/io/flutter/plugins/firebase/messaging/FlutterFirebaseMessagingReceiver.java
index f9e10df1bd1c..ef5686fbf32f 100644
--- a/packages/firebase_messaging/firebase_messaging/android/src/main/java/io/flutter/plugins/firebase/messaging/FlutterFirebaseMessagingReceiver.java
+++ b/packages/firebase_messaging/firebase_messaging/android/src/main/java/io/flutter/plugins/firebase/messaging/FlutterFirebaseMessagingReceiver.java
@@ -11,11 +11,19 @@
 import android.util.Log;
 import com.google.firebase.messaging.RemoteMessage;
 import java.util.HashMap;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
 
 public class FlutterFirebaseMessagingReceiver extends BroadcastReceiver {
   private static final String TAG = "FLTFireMsgReceiver";
   static HashMap<String, RemoteMessage> notifications = new HashMap<>();
 
+  // SharedPreferences writes and process-state lookups must not run on the main
+  // thread: when a receiver returns, Android blocks the main thread until all
+  // pending SharedPreferences.apply() writes have hit disk (QueuedWork.waitToFinish),
+  // which causes ANRs under I/O pressure.
+  private static final Executor backgroundExecutor = Executors.newSingleThreadExecutor();
+
   @Override
   public void onReceive(Context context, Intent intent) {
     Log.d(TAG, "broadcast received for message");
@@ -38,37 +46,53 @@ public void onReceive(Context context, Intent intent) {
 
     RemoteMessage remoteMessage = new RemoteMessage(intent.getExtras());
 
-    // Store the RemoteMessage if the message contains a notification payload.
+    // Keep the in-memory message available to the plugin on the main thread; it is
+    // read from the main thread when a notification is tapped.
     if (remoteMessage.getNotification() != null) {
       notifications.put(remoteMessage.getMessageId(), remoteMessage);
-      FlutterFirebaseMessagingStore.getInstance().storeFirebaseMessage(remoteMessage);
     }
 
-    //  |-> ---------------------
-    //      App in Foreground
-    //   ------------------------
-    if (FlutterFirebaseMessagingUtils.isApplicationForeground(context)) {
-      FlutterFirebaseRemoteMessageLiveData.getInstance().postRemoteMessage(remoteMessage);
-      return;
-    }
+    // goAsync() keeps the broadcast alive until pendingResult.finish() so the
+    // remaining work can safely run off the main thread.
+    final PendingResult pendingResult = goAsync();
+    backgroundExecutor.execute(
+        () -> {
+          try {
+            // Store the RemoteMessage if the message contains a notification payload.
+            if (remoteMessage.getNotification() != null) {
+              FlutterFirebaseMessagingStore.getInstance().storeFirebaseMessage(remoteMessage);
+            }
+
+            //  |-> ---------------------
+            //      App in Foreground
+            //   ------------------------
+            if (FlutterFirebaseMessagingUtils.isApplicationForeground(context)) {
+              FlutterFirebaseRemoteMessageLiveData.getInstance().postRemoteMessage(remoteMessage);
+              return;
+            }
 
-    //  |-> ---------------------
-    //    App in Background/Quit
-    //   ------------------------
-    Intent onBackgroundMessageIntent =
-        new Intent(context, FlutterFirebaseMessagingBackgroundService.class);
+            //  |-> ---------------------
+            //    App in Background/Quit
+            //   ------------------------
+            Intent onBackgroundMessageIntent =
+                new Intent(context, FlutterFirebaseMessagingBackgroundService.class);
 
-    Parcel parcel = Parcel.obtain();
-    remoteMessage.writeToParcel(parcel, 0);
-    // We write to parcel using RemoteMessage.writeToParcel() to pass entire RemoteMessage as array
-    // of bytes
-    // Which can be read using RemoteMessage.createFromParcel(parcel) API
-    onBackgroundMessageIntent.putExtra(
-        FlutterFirebaseMessagingUtils.EXTRA_REMOTE_MESSAGE, parcel.marshall());
+            Parcel parcel = Parcel.obtain();
+            remoteMessage.writeToParcel(parcel, 0);
+            // We write to parcel using RemoteMessage.writeToParcel() to pass entire RemoteMessage
+            // as array
+            // of bytes
+            // Which can be read using RemoteMessage.createFromParcel(parcel) API
+            onBackgroundMessageIntent.putExtra(
+                FlutterFirebaseMessagingUtils.EXTRA_REMOTE_MESSAGE, parcel.marshall());
 
-    FlutterFirebaseMessagingBackgroundService.enqueueMessageProcessing(
-        context,
-        onBackgroundMessageIntent,
-        remoteMessage.getOriginalPriority() == RemoteMessage.PRIORITY_HIGH);
+            FlutterFirebaseMessagingBackgroundService.enqueueMessageProcessing(
+                context,
+                onBackgroundMessageIntent,
+                remoteMessage.getOriginalPriority() == RemoteMessage.PRIORITY_HIGH);
+          } finally {
+            pendingResult.finish();
+          }
+        });
   }
 }