Android RxScala/Java-为什么我的progressBar没有出现?
我有一个带有Android RxScala/Java-为什么我的progressBar没有出现?,android,rx-java,observable,rx-scala,Android,Rx Java,Observable,Rx Scala,我有一个带有SearchView的简单应用程序,用户可以根据我显示/隐藏某些视图小部件的状态进行查询。我很难找到为什么ProgressBar始终不可见。有人能说出为什么装载指示器从未出现吗 代码如下: trait MainView { def searchIntent(): Observable[String] def render(viewState: PartialMainViewState) } 演示者: class MainPresenter(...) { def b
SearchView
的简单应用程序,用户可以根据我显示/隐藏某些视图小部件的状态进行查询。我很难找到为什么ProgressBar
始终不可见。有人能说出为什么装载指示器从未出现吗
代码如下:
trait MainView {
def searchIntent(): Observable[String]
def render(viewState: PartialMainViewState)
}
演示者:
class MainPresenter(...) {
def bind(mainView: MainView) = {
val searchQueryObservable = mainView.searchIntent()
.flatMap(s => mainInteractor.search(s))
searchQueryObservable.observeOn(AndroidSchedulers.mainThread()).subscribe { state => mainView.render(state) }
}
}
具有实际渲染的活动:
class SimpleActivity extends BaseSearchActivity with MainView {
override def searchIntent(): Observable[String] = {
Observable.defer {
RxSearchView.queryTextChanges(vh.searchView)
.filter((ev: CharSequence) => ev.length >= 2 || ev.length == 0)
.debounce(500.milliseconds)
.map[String]((ev: CharSequence) => ev.toString())
}
}
override def render(viewState: PartialMainViewState): Unit =
viewState match {
case SearchNotStartedYet => renderSearchNotStarted()
case Loading => renderLoading()
case EmptyResult(_) => renderEmptyResult()
case SearchResult(_, res) => renderResult(res)
...
}
def renderSearchNotStarted(): Unit = {
vh.list.setVisibility(View.GONE)
vh.progressBar.setVisibility(View.GONE)
vh.emptyView.setVisibility(View.GONE)
}
def renderLoading(): Unit = {
vh.list.setVisibility(View.GONE)
vh.progressBar.setVisibility(View.VISIBLE)
vh.emptyView.setVisibility(View.GONE)
}
def renderEmptyResult(): Unit = {
vh.list.setVisibility(View.GONE)
vh.progressBar.setVisibility(View.GONE)
vh.emptyView.setVisibility(View.VISIBLE)
}
def renderResult(result: Array[String]): Unit = {
vh.list.setVisibility(View.VISIBLE)
vh.progressBar.setVisibility(View.GONE)
vh.emptyView.setVisibility(View.GONE)
//setting the adapter etc
}
}
这里我正在模拟一个网络请求:
class SimpleInteractor(...) {
def search(query: String): Observable[PartialMainViewState] = {
Thread.sleep(1500) // to simulate "Network latency"
if(query.isEmpty) Observable.just(SearchNotStartedYet)
else Observable.just(persons.filter(_.toLowerCase().contains(query.toLowerCase())))
.map(array => {
if(array.isEmpty) EmptyResult(query) else SearchResult(query, array)
}).+:(Loading).onErrorReturn(error => ErrorState(query, error))
}
}
在演示者中,通过添加
subscribebeon
操作符,尝试在不同的线程上订阅:
searchQueryObservable.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe { state => mainView.render(state) }
这使得应用程序崩溃,出现了一个
java.lang.IllegalStateException:预期会在主线程上调用,但被RxIoScheduler-2
aha,我认为这是因为源是一个UI事件。将搜索部分移到io
thread:.flatMap(s=>mainteractor.search(s).subscribeOn(Schedulers.io())
?调试thread.sleep(1500)
行,看看您挂起的是哪个线程,我猜您挂起的是主线程,这就是为什么进度条没有出现的原因