What are /r/Appium's favorite Products & Services?

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Add it to the Desired Capabilities. http://appium.io/slate/en/master/?java#appium-server-capabilities I added it on the script level, but the documentation also shows doing it on the server level.
Hopefully this is helpful.

Webview is very trick. If you have a android v 5+ devices then it will work better. On older devices you wont be able to see it using appium / uiautomtorviewer.

On newer devices this system app is already installed. https://play.google.com/store/apps/details?id=com.google.android.webview&hl=en