描述

客户已集成 Firebase Messaging，Android 平台 Flutter IM SDK 的不触发任何回调。

分析（根因分析、需求分析）

可能原因是客户构建了一个 FlutterEngine instance，导致 SDK 的 FlutterEngine instance 失效了。

解决方案

找到以下 java 文件

packages/firebase_messaging/firebase_messaging/android/src/main/java/io/flutter/plugins/firebase/messaging/FlutterFirebaseMessagingBackgroundExecutor.java

修改代码如下：

if (shellArgs != null) {

Log.i(

TAG,

"Creating background FlutterEngine instance, with args: "

+ Arrays.toString(shellArgs.toArray()));

// 1. 修改此处如下

// backgroundFlutterEngine =

// new FlutterEngine(

// ContextHolder.getApplicationContext(), shellArgs.toArray());

backgroundFlutterEngine =

new FlutterEngine(

ContextHolder.getApplicationContext(), shellArgs.toArray(), false);

} else {

Log.i(TAG, "Creating background FlutterEngine instance.");

// 2. 修改此处如下

// backgroundFlutterEngine =

// new FlutterEngine(ContextHolder.getApplicationContext());

backgroundFlutterEngine =

new FlutterEngine(ContextHolder.getApplicationContext(), null, false);

}