获取arch WorkManager运行状态

// 创建后台任务
OneTimeWorkRequest workRequest = new OneTimeWorkRequest.Builder(MyWorker.class).build();

// 添加任务状态观察者
WorkManager.getInstance(context).getWorkInfoByIdLiveData(workRequest.getId())
    .observe(owner, workInfo -> {
        if (workInfo != null) {
            WorkInfo.State state = workInfo.getState();
            // 处理任务状态变化
            if (state == WorkInfo.State.ENQUEUED) {
                // 任务已入队
            } else if (state == WorkInfo.State.RUNNING) {
                // 任务运行中
            } else if (state == WorkInfo.State.SUCCEEDED) {
                // 任务成功完成
            } else if (state == WorkInfo.State.FAILED) {
                // 任务失败
            }
        }
    });