"Getting Started" instructions causing "Manifest merger" error

• I have searched existing issues and this is not a duplicate

Version

Add the version of the litho packages you use. You can paste the dependency section of the gradle file if you have one.

implementation 'com.facebook.litho:litho-core:0.25.0'
implementation 'com.facebook.litho:litho-widget:0.25.0'
annotationProcessor 'com.facebook.litho:litho-processor:0.25.0'
implementation 'com.facebook.soloader:soloader:0.5.1'
implementation 'com.facebook.litho:litho-fresco:0.25.0'
testImplementation 'com.facebook.litho:litho-testing:0.25.0'

Issues and Steps to Reproduce

Replace this with steps to repro your issue. The “Getting Started” guide isn’t working on my system: https://fblitho.com/docs/getting-started

1. Open Android Studio 3.4 on Ubuntu 18.04.2 LTS.
2. Create new project with “Empty Activity” and Java language. Leave minimum API level as 15.
3. Click “Gradle Scripts” in left pane, and see two “build.gradle” files (“Getting Started” could specify more clearly which one to use).
4. Click first “build.gradle”, and note that “jcenter()” is included under “repositories”.
5. Click second “build.gradle”, and paste implementation lines from "Getting Started at the bottom of “dependencies” (a copy of the lines I pasted is under the “Version” header of this issue).
6. Click “Build Output” in lower bar. See error:

Manifest merger failed : Attribute application@appComponentFactory value=(android.support.v4.app.CoreComponentFactory) from [com.android.support:support-compat:28.0.0] AndroidManifest.xml:22:18-91
	is also present at [androidx.core:core:1.0.0] AndroidManifest.xml:22:18-86 value=(androidx.core.app.CoreComponentFactory).
	Suggestion: add 'tools:replace="android:appComponentFactory"' to <application> element at AndroidManifest.xml:5:5-19:19 to override.

Attempting to follow the error message’s advice results in a different trail of issues. There are two existing Stack Overflow issues about this: https://stackoverflow.com/questions/54323638/manifest-merger-failed-error-in-android-gradle https://stackoverflow.com/questions/28095703/manifest-merger-failed-error/31793227

Expected Behavior

Describe what you expected would happen.

No errors. Thanks! Hopefully, there is an official fix, or I’m just making a silly mistake.

[pavlospt]

A library that has already migrated to AndroidX can not be used in non-AndroidX projects!

[colriot]

Awesome! Closing this one then