Firebaseui-android: Error:Execution failed for task ':app:preDebugAndroidTestBuild'. > Conflict with dependency 'com.android.support:support-annotations' in project ':app'. Resolved versions for app (26.1.0) and test app (27.1.1) differ. See https://d.android.com/r/tools/test-apk-dependency-conflicts.html for details.

[royal008]

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[samtstern]

@royal008 please fill out the issue template when filing an issue. As I can see from the issue title, this is not a FirebaseUI issue but a normal dependency issue. If you need help solving it please try StackOverflow.

[CUET-sajib10]

I solved this problem by changing in app.gradle as following -
Replacing
implementation 'com.android.support:appcompat-v7:26.0.1'
wihth
implementation 'com.android.support:appcompat-v7:27.1.1'

[abhilashasurmount]

Replace
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
with
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'

[SubhamKuswa]

implementation 'com.android.support:appcompat-v7:26.0.1'
with
implementation 'com.android.support:appcompat-v7:27.1.

This solution is working only for one project when i create new project same issue is occuring
i know i can replace these line in every project but i want to know why it is happenning

[abhilashasurmount]

implementation 'com.android.support:appcompat-v7:26.0.1'
with
implementation 'com.android.support:appcompat-v7:27.1.
This solution is working only for one project when i create new project same issue is occuring i know i can replace these line in every project but i want to know why it is happening.

This happens because while creating project you are not setting correct compileSdkVersion, minSdkVersion & targetSdkVersion. Make sure these three values matches the required version.

@SubhamKuswa

[SubhamKuswa]

thank you i will try it..

On Tue, May 29, 2018, 12:12 PM abhilashasurmount [e-mail]
wrote:

implementation 'com.android.support:appcompat-v7:26.0.1'
with
implementation 'com.android.support:appcompat-v7:27.1.
This solution is working only for one project when i create new project
same issue is occuring i know i can replace these line in every project but
i want to know why it is happening.

This happens because while creating project you are not setting correct
compileSdkVersion, minSdkVersion & targetSdkVersion. Make sure
these three values matches the required version.

@SubhamKuswa https://github.com/SubhamKuswa

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[rajbhalala]

@SubhamKuswa did you able to solve this problem ? because i am facing the same problem