显示运行 WorkManager 工作进程的详细进度 [英] Showing detailed progress for running WorkManager workers

问题描述

我想用新的 JetPack

在最终产品中，用户将能够取消任何正在进行的工作并重新发出一次性工作请求.通常，作业将被 PeriodicWorkRequest 触发.

解决方案

最好的方法是将中间进度写入您自己的数据存储并公开一个 LiveData<>.我们正在考虑在未来的 alpha 中添加此功能.

I want to replace the job scheduling aspect of my existing data syncing system with the new JetPack WorkManager (link to codelabs) component (in a sandbox branch of the app). My existing system works well but some of the new features in WorkManager would come in handy (e.g. chaining).

My current system uses a shared LiveData to communicate the progress from a job in progress to any UI element (RecyclerView in my case) observing on it (I'm actually SwitchMapping in the ViewModel into a list of SyncItems)

data class SyncItem(
        val title: String,
        private var _progress: Int,
        var total: Int) : BaseObservable() {

    var progress: Int
        @Bindable get() = _progress
        set(value) {
            _progress = value
            notifyPropertyChanged(BR.progress)
        }
}

The new WorkManager component has several methods (getStatusById, getStatusesByTag, etc.) that can be used to retrieve a LiveData with one or more WorkStatuses, but these only report a course-grained status (running, success, failed, cancelled).

What is the recommended way of communicating progress (e.g. '546/1234 items downloaded') to the UI? The setOutputData/getOutputData pair seems to be used more to communicate between Workers (which I need when chaining) than with the UI.

Attached is a screenshot of what it looks like (in a [test] version of my app using my old method) when a user opens the sync status page (2 items completed, rest in progress).

In the final product the user will be able to cancel any jobs in progress and re-issue once-off work requests. Normally the jobs will be fired off by PeriodicWorkRequest.

解决方案

The best way to do it is to write intermediate progress to your own data store and expose a LiveData<>. We are considering adding this feature in a future alpha.

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