UiDevice class missing from UIAutomator 2.1.2

问题

I found that "upgrading" my reference to UIAutomator in build.gradle to 2.1.2 broke any references I had to the UiDevice class. In fact, a lot seems to have changed but I'm finding nothing explaining it.

Can anyone shed some light on what is (apparently) about to change?

This works:

androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.1.1'

This does not:

androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.1.2'

Dependencies from build.gradle follow (made a mess of by trying to figure this out):

testCompile 'junit:junit:4.12'
// Optional -- Mockito framework
testCompile 'org.mockito:mockito-core:1.10.19'

androidTestCompile('com.android.support.test.espresso:espresso-core:3.0.0', {
    exclude group: 'com.android.support', module: 'support-annotations'
})

// Optional -- UI testing with UI Automator
androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.1.1'
androidTestCompile 'com.android.support:support-annotations:26.0.0'
androidTestCompile 'com.android.support.test:runner:1.0.0'
androidTestCompile 'com.android.support.test:rules:1.0.0'
// Optional -- Hamcrest library
androidTestCompile 'org.hamcrest:hamcrest-library:1.3'

// Optional -- UI testing with Espresso
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.volley:volley:1.0.0'
compile 'com.google.code.gson:gson:2.8.0'
compile 'com.android.support:appcompat-v7:26.0.0'
compile 'com.android.support:design:26.0.0'
compile 'com.android.support:support-v4:26.0.0'

来源：https://stackoverflow.com/questions/45665660/uidevice-class-missing-from-uiautomator-2-1-2