before android update 3.4 my application run perfectly but after upgrade android my application getting merging error:
\"Duplicate class android.support.v4.
You have androidx
libraries (probably in one of the used libraries) conflicting with the support
libraries.
Add these lines into your gradle.properties
file: (It's in the root directory of your project)
android.useAndroidX=true
android.enableJetifier=true
The Jetifier tool migrates support-library-dependent libraries to rely on the equivalent AndroidX packages instead.