Appium无法在安卓平板Chrome自定义标签页中滚动的技术求助

Hey there! Let's tackle your scroll problem with Chrome Custom Tabs (CCT) in Appium step by step. First, let's clear up your core question: you don't need to treat CCT as a separate browser vs. Android app—it's a hybrid component (native wrapper + Chrome WebView), so we just need to adjust our automation approach to match how CCT works.

Why Your Current Methods Aren't Working #

1. Touch Action from Appium Desktop: Appium Desktop often generates deprecated TouchAction code (from Appium 1.x), which isn't compatible with newer Appium 2.x versions. You'll need to switch to W3C Actions instead.
2. UiScrollable Failure: UiScrollable is a UiAutomator2 tool designed for native Android elements, but CCT's content runs inside a WebView. UiAutomator2 can't access DOM elements inside the WebView, so UiScrollable won't work here.

Fixes to Get Scrolling Working #

1. Use Appium's mobile: scroll Command (Simplest Approach) #

This is Appium's built-in mobile command for scrolling, which works well for both native and WebView contexts. Here's how to implement it in Java:

// Scroll down the viewport
Map<String, Object> scrollParams = new HashMap<>();
scrollParams.put("direction", "down");
scrollParams.put("percent", 0.75); // Adjust scroll distance (0 to 1)
driver.executeScript("mobile: scroll", scrollParams);

// If you need to scroll to a specific visible element (once you can locate it)
WebElement targetElement = driver.findElement(By.id("your-element-id"));
scrollParams.put("element", ((RemoteWebElement) targetElement).getId());
driver.executeScript("mobile: scroll", scrollParams);

2. Switch to W3C Actions for Custom Touch Gestures #

If you need more control over the scroll (like specific coordinates), use W3C Actions (the modern replacement for TouchAction). Example for a tablet:

import org.openqa.selenium.interactions.PointerInput;
import org.openqa.selenium.interactions.Sequence;
import java.time.Duration;
import java.util.Arrays;

// Define the touch input source
PointerInput finger = new PointerInput(PointerInput.Kind.TOUCH, "finger");

// Create a scroll sequence: press, move up, release
Sequence scrollDown = new Sequence(finger, 1)
    // Start at the bottom-middle of the screen (adjust coordinates for your tablet)
    .addAction(finger.createPointerMove(Duration.ofMillis(0), PointerInput.Origin.viewport(), 600, 1800))
    .addAction(finger.createPointerDown(PointerInput.MouseButton.LEFT.asArg()))
    // Move up to the middle of the screen over 1 second
    .addAction(finger.createPointerMove(Duration.ofMillis(1000), PointerInput.Origin.viewport(), 600, 600))
    .addAction(finger.createPointerUp(PointerInput.MouseButton.LEFT.asArg()));

// Perform the scroll
driver.perform(Arrays.asList(scrollDown));

Note: Adjust the coordinates based on your tablet's screen resolution—you can get viewport dimensions with driver.manage().window().getSize().

3. Configure Appium Correctly for CCT #

To ensure Appium can interact with CCT's WebView:

• Make sure you're targeting the Chrome package (CCT runs on Chrome's engine):

  ChromeOptions chromeOptions = new ChromeOptions();
  // Point to Chrome's package (required for CCT)
  chromeOptions.setExperimentalOption("androidPackage", "com.android.chrome");
  // Reuse the running CCT instance instead of launching a new Chrome window
  chromeOptions.setExperimentalOption("androidUseRunningApp", true);
  
  DesiredCapabilities caps = new DesiredCapabilities();
  caps.setCapability(MobileCapabilityType.PLATFORM_NAME, "Android");
  caps.setCapability(MobileCapabilityType.DEVICE_NAME, "YourTabletName");
  caps.setCapability(ChromeOptions.CAPABILITY, chromeOptions);
  
  AndroidDriver driver = new AndroidDriver(new URL("http://127.0.0.1:4723/wd/hub"), caps);
  

• Enable WebView debugging on your tablet: Open Chrome, go to chrome://inspect, and ensure your device and CCT WebView are listed.
• Match ChromeDriver version to your device's Chrome version: Download the same major version ChromeDriver as the Chrome installed on your tablet, and configure Appium to use it.

4. WebView Context Scrolling (For DOM Elements) #

If you've switched to the WebView context (driver.context("WEBVIEW_com.android.chrome")), you can also use standard WebDriver scroll methods for DOM elements:

// Scroll an element into view
WebElement element = driver.findElement(By.cssSelector(".your-class"));
((JavascriptExecutor) driver).executeScript("arguments[0].scrollIntoView(true);", element);

Final Notes #

• Always check Appium logs for errors—they'll tell you if you're in the wrong context, or if ChromeDriver isn't matching Chrome's version.
• Avoid mixing native and WebView contexts unnecessarily: Switch to the WebView context when interacting with CCT's web content, and switch back to native if you need to interact with CCT's native UI (like the close button).

内容的提问来源于stack exchange，提问作者Manisha