Question

刚开始尝试“ Rx-ify”一些Android的Webview事件。

class PageStartData(val url: String, val favicon: Bitmap?)

myWebview.webViewClient = object: WebViewClient() {

   val pageStartEvents: Observable<PageStartData> = Observable.create{ emitter->
      override fun onPageStarted(view: WebView, url: String, favicon: Bitmap){
          emitter.onNext(PageStartData(url, favicon))
      }
   }

}

我发现onPageStarted函数超出了发射器lambda函数的范围。很简单，我确定。如何解决？

感谢所有帮助。

Answer 1

检查：

sealed class WebViewEvent {
    data class PageStartData(val url: String?,
                             val favicon: Bitmap?) : WebViewEvent()
}

...

class RxWebViewWrapper(private val webView: WebView) : ObservableOnSubscribe<WebViewEvent> {
    override fun subscribe(emitter: ObservableEmitter<WebViewEvent>) {
        webView.webViewClient = object :WebViewClient(){
            override fun onPageStarted(view: WebView?,
                                       url: String?,
                                       favicon: Bitmap?) {
                super.onPageStarted(view, url, favicon)
                emitter.onNext(WebViewEvent.PageStartData(url, favicon))
            }
        }
    }
}

...

val source = Observable.create<WebViewEvent>(RxWebViewWrapper(myWebview))

Answer 2

可以通过PublishSubject

完成

myWebview.webViewClient = object : WebViewClient() {
        private val pageStartSubject = PublishSubject.create<PageStartData>()
        val pageStartEvents: Observable<PageStartData> = pageStartSubject

        override fun onPageStarted(view: WebView, url: String, favicon: Bitmap) {
            pageStartSubject.onNext(PageStartData(url, favicon))
        }
    }

RxJava2，Android，Webview在Kotlin中创建可观察的

2 个答案: