使用RxPagedListBuilder时如何处理loadRange（）中的异常

Question

我正在使用RxPagedListBuilder来获取分页列表。我不知道为什么loadRange（）引发的异常不会被捕获到可观察对象的onError()中。该应用程序刚刚崩溃。知道如何使用RxJava方式处理loadRange()中的异常吗？

以下是我完整的源代码：

class MinimalPagingActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_paging)

        val adapter =  DummyPagedListAdapter()
        list.adapter = adapter
        list.layoutManager = LinearLayoutManager(this)

        RxPagedListBuilder(
            DummyDataSourceFactory(), 3
        ).buildObservable().subscribe({
            Timber.i(it.toString())
            adapter.submitList(it)
        }, {
            // I want to handle both loadInitial() & loadRange() execeptions here.
            Timber.e(it)
        })
    }
}


class DummyDataSource : PositionalDataSource<String>() {
    override fun loadInitial(params: LoadInitialParams, callback: LoadInitialCallback<String>) {
        // throw RuntimeException("This exception will go to onError() which is I expected") 
        callback.onResult(listOf("a", "b", "c"), 0, 6)
    }

    override fun loadRange(params: LoadRangeParams, callback: LoadRangeCallback<String>) {
        throw RuntimeException("This exception will crash the app")
        // I want to handle this exception in the returned observable in RxPagedListBuilder. that's, this exception should be passed to onError(), but it didn't.
        callback.onResult(listOf("d", "e", "f"))
    }
}


class DummyDataSourceFactory : DataSource.Factory<Int, String>() {
    override fun create(): DataSource<Int, String> {
        return DummyDataSource()
    }
}

val diffCallback = object : DiffUtil.ItemCallback<String>() {
    override fun areItemsTheSame(oldItem: String, newItem: String): Boolean {
        return oldItem == newItem
    }

    override fun areContentsTheSame(oldItem: String, newItem: String): Boolean {
        return oldItem == newItem
    }
}

class DummyPagedListAdapter: PagedListAdapter<String, DummyPagedListAdapter.ViewHolder>(diffCallback) {
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        return ViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.item_data, parent, false))

    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        getItem(position)?.apply {
            holder.bind(this)
        }
    }

    class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        fun bind(data: String) {
            itemView.data.text = data
        }
    }
}