Question

我正在编写一段使用Kotlin的协程pipilens和Androids数据绑定的代码。

在工作时，我发现当我的协程车由于“ ClosedReceiveChannelException”崩溃时，绑定的视图模型（通过数据绑定）不会更新“数据绑定组件”。

fun onProcessStart(cachedImageId: String) = viewModelScope.launch {
    text = "Started for image: $cachedImageId"

    try {
        val extractedTextPipe = extractText(cachedImageId)
        val processedTextPipe = processText(extractedTextPipe)
        val processedText = processedTextPipe.receive()
        text = "Finished for image: $cachedImageId"
    } catch (t: Throwable) {
        Log.d("TEST", t.message+ " "+t)
        text = "Failed for image: $cachedImageId with code: ${t.message}"
    }
}

尽管触发了捕获，并且Log.d出现在日志中，但是带有新消息的text从未更新。

如果以下各项也无法正常工作，那将不是一个惊喜：

 fun onProcessStart(cachedImageId: String) = viewModelScope.launch {
        text = "Started for image: $cachedImageId"

        try {
            throw IllegalStateException()
            text = "Finished for image: $cachedImageId"
        } catch (t: Throwable) {
            Log.d("TEST", t.message+ " "+t)
            text = "Failed for image: $cachedImageId with code: ${t.message}"
        }
    }

上述代码有效-catch中的文本已更新。

我的问题是-为什么一旦val processedText = processedTextPipe.receive()抛出ClosedReceiveChannelException时，text的值就会停止更新。

-编辑还可以通过以下方法观察到此问题：

  text = "Started for image: $cachedImageId"

    try {
        delay(10000)
        throw IllegalStateException()
    } catch (t: Throwable) {
        Log.d("TEST", t.message + " " + t + " " + Thread.currentThread().id)
        text = "Failed for image: $cachedImageId with code: ${t.message}"
    }

Answer 1

好-睡了一觉后，我发现我忘记在LiveData字段中使用text。

ClosedReceiveChannelException和数据绑定的问题

1 个答案: