Appium在等待root AccessibilityNodeInfo 10000毫秒后超时

Question

偶尔出现以下 appium 错误，不知道如何解决。有什么方法可以增加此超时或帮助解决此问题？感谢您的帮助。

selenium.common.exceptions.WebDriverException: Message: An unknown server-side error occurred while processing the command. Original error: io.appium.uiautomator2.common.exceptions.UiAutomator2Exception: Timed out after 10000 milliseconds waiting for root AccessibilityNodeInfo
    at io.appium.uiautomator2.utils.AXWindowHelpers.refreshRootAXNode(AXWindowHelpers.java:78)
    at io.appium.uiautomator2.handler.Source.safeHandle(Source.java:38)
    at io.appium.uiautomator2.handler.request.SafeRequestHandler.handle(SafeRequestHandler.java:36)
    at io.appium.uiautomator2.server.AppiumServlet.handleRequest(AppiumServlet.java:250)
    at io.appium.uiautomator2.server.AppiumServlet.handleHttpRequest(AppiumServlet.java:241)
    at io.appium.uiautomator2.http.ServerHandler.channelRead(ServerHandler.java:44)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
    at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
    at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:435)
    at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:293)
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:267)
    at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:250)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:345)
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1294)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:366)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:352)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:911)
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:611)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:552)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:466)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:438)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:140)
    at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
    at java.lang.Thread.run(Thread.java:764)

../../.ve/qa/lib/python3.7/site-packages/selenium/webdriver/remote/errorhandler.py:242: WebDriverException

Answer 1

实际上，您在这里无能为力。您遇到的异常发生在 system function call :

root = UiAutomatorBridge.getInstance().getAccessibilityRootNode();

它调用 following code :

    public AccessibilityNodeInfo getAccessibilityRootNode() throws UiAutomator2Exception {
        Object queryController = invoke(method(UiDevice.class, "getQueryController"), Device.getUiDevice());
        return (AccessibilityNodeInfo) invoke(method(queryController.getClass(), "getRootNode"), queryController);
    }

这不是 Appium 的问题，而是 Uiautomator 的问题 Google ，Appium 在幕后使用。

从代码中可以看出，您不能增加超时。我建议尝试重置设备/使用其他设备/模拟器。