是的，在androidx.work库全面替代Firebase JobDispatcher之后，Android 12中已从SDK中移除了Firebase JobDispatcher。

如果你的应用程序正在使用Firebase JobDispatcher，建议你迁移到androidx.work库来实现后台任务调度。以下是将Firebase JobDispatcher迁移到androidx.work的代码示例：

首先，将Firebase JobDispatcher依赖项替换为androidx.work库：

//之前
implementation 'com.firebase:firebase-jobdispatcher:0.8.5'

//之后
implementation 'androidx.work:work-runtime:2.5.0'

接下来，将Firebase JobDispatcher的代码替换为androidx.work的代码，如下所示：

//之前
FirebaseJobDispatcher dispatcher = new FirebaseJobDispatcher(new GooglePlayDriver(context));
Job myJob = dispatcher.newJobBuilder()
        .setService(MyJobService.class)
        .setTag("my-job-tag")
        .setConstraints(
                Constraint.ON_ANY_NETWORK,
                Constraint.DEVICE_IDLE,
                Constraint.DEVICE_CHARGING
        )
        .setLifetime(Lifetime.FOREVER)
        .setRecurring(true)
        .setTrigger(Trigger.executionWindow(0, 60))
        .setReplaceCurrent(false)
        .build();
dispatcher.mustSchedule(myJob); 

//之后
PeriodicWorkRequest.Builder myWorkBuilder =
        new PeriodicWorkRequest.Builder(MyWorker.class, 1, TimeUnit.HOURS)
                .setConstraints(
                        new Constraints.Builder()
                                .setRequiredNetworkType(NetworkType.UNMETERED)
                                .setRequiresDeviceIdle(true)
                                .setRequiresCharging(true)
                                .build()
                );
PeriodicWorkRequest myWork = myWorkBuilder.build();
WorkManager.getInstance(context).enqueueUniquePeriodicWork(
        "my-work-tag",
        ExistingPeriodicWorkPolicy.REPLACE,
        myWork
);

以上示例只是一个简单的示例，你仍需要调整约束条件、执行时间以及其他参数以适应你的需求。对于更复杂的情况，可以参考官方文档和代码示例进行