无法在运行时使用Appium标识元素

Question

DesiredCapabilities cap = new DesiredCapabilities();
cap.setCapability(MobileCapabilityType.APP, app.getAbsolutePath());         
cap.setCapability(MobileCapabilityType.PLATFORM_NAME, MobilePlatform.ANDROID);
cap.setCapability(MobileCapabilityType.DEVICE_NAME, "Google Pixel 2");
cap.setCapability(MobileCapabilityType.BROWSER_NAME,"");
cap.setCapability(MobileCapabilityType.PLATFORM_VERSION, "8.0");
cap.setCapability("automationName", "UiAutomator2");    
cap.setCapability(AndroidMobileCapabilityType.APP_PACKAGE, "com.kruxanalytics.kruxmetrix");
cap.setCapability(AndroidMobileCapabilityType.APP_ACTIVITY, "com.kruxanalytics.kruxmetrix.MainActivity");

I have tried the following find element methods:

driver.findElementByAccessibilityId("LOGIN").click();
driver.findElement(By.xpath("//android.widget.Button[@content-desc='LOGIN']")).click();

Appium log mostly contains this:
[WD Proxy] Got an unexpected response: {"sessionId":"5f7bca9b-2e8b-46a7-9727-53a85e0d6df0","status":7,"value":"An element could not be located on the page using the given search parameters."}
[debug] [MJSONWP] Matched JSONWP error code 7 to NoSuchElementError

Answer 1

我怀疑您的应用程序是否能够立即加载，很可能您需要引入WebDriverWait，以便在特定的时间跨度内查询应用程序中的指定元素。

所以更改这一行：

driver.findElementByAccessibilityId("LOGIN").click();

对此：

new WebDriverWait(driver,30)
        .until(ExpectedConditions
                .elementToBeClickable(By.xpath("//android.widget.Button[@content-desc='LOGIN ']")))
        .click();