Duplicate class com.google.common.util.concurrent.ListenableFuture found in modules guava-20.0.jar (com.google.guava:guava:20.0)

Question

When I use implementation \'com.google.firebase:firebase-inappmessaging-display:17.2.0\' in my app/build.gradle, I get this error:

Answer 1

I encountered the same problem. I added the line below

implementation 'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava'

This works but I encountered another issue- Cannot fit requested classes in a single dex file (# methods: 89411 > 65536) To resolve this error make sure to enable multiDex as below

defaultConfig {
    applicationId "com.techweezy.smartsync"
    minSdkVersion 19
    targetSdkVersion 29
    versionCode 5
    versionName "1.4"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    multiDexEnabled true //added this line
}

Then finally add the below lines.

   implementation 'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava'
    implementation 'androidx.multidex:multidex:2.0.1'

Answer 2

I found the solution at How to solve Program type already present: com.google.common.util.concurrent.ListenableFuture?. user2297550 said:

I merely added implementation 'com.google.guava:guava:27.0.1-android' at the end of my app gradle file and the error went away.

That was the solution for me. Now I have this and my app compiles correctly:

implementation 'com.google.firebase:firebase-inappmessaging-display:17.2.0'
implementation 'com.google.guava:guava:27.0.1-android'