build.gradle should specify non-`+` version of Play Services dependency

[taylorkline]

I realize this library is no longer maintained, but perhaps by tracking this, it will help someone else.

This library currently specifies the dependency of play-services-ads as 'com.google.android.gms:play-services-ads:+'. This means the version used may vary over time.

In our case, it appears the September 22, 2021 release of a play-services-ads dependency broke our build, resulting in build errors of:

> Task :app:checkReleaseDuplicateClasses FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:checkReleaseDuplicateClasses'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable
   > Duplicate class com.google.android.gms.internal.measurement.zzbs found in modules jetified-play-services-measurement-18.0.2-runtime (com.google.android.gms:play-services-measurement:18.0.2) and jetified-play-services-measurement-sdk-api-18.0.3-runtime (com.google.android.gms:play-services-measurement-sdk-api:18.0.3)
     Duplicate class com.google.android.gms.internal.measurement.zzl found in modules jetified-play-services-measurement-impl-18.0.2-runtime (com.google.android.gms:play-services-measurement-impl:18.0.2) and jetified-play-services-measurement-sdk-api-18.0.3-runtime (com.google.android.gms:play-services-measurement-sdk-api:18.0.3)
     Duplicate class com.google.android.gms.measurement.internal.zzfh found in modules jetified-play-services-measurement-base-18.0.3-runtime (com.google.android.gms:play-services-measurement-base:18.0.3) and jetified-play-services-measurement-impl-18.0.2-runtime (com.google.android.gms:play-services-measurement-impl:18.0.2)
     Duplicate class com.google.android.gms.measurement.internal.zzgn found in modules jetified-play-services-measurement-base-18.0.3-runtime (com.google.android.gms:play-services-measurement-base:18.0.3) and jetified-play-services-measurement-impl-18.0.2-runtime (com.google.android.gms:play-services-measurement-impl:18.0.2)
     Duplicate class com.google.android.gms.measurement.internal.zzgo found in modules jetified-play-services-measurement-base-18.0.3-runtime (com.google.android.gms:play-services-measurement-base:18.0.3) and jetified-play-services-measurement-impl-18.0.2-runtime (com.google.android.gms:play-services-measurement-impl:18.0.2)
     Duplicate class com.google.android.gms.measurement.internal.zzgp found in modules jetified-play-services-measurement-base-18.0.3-runtime (com.google.android.gms:play-services-measurement-base:18.0.3) and jetified-play-services-measurement-impl-18.0.2-runtime (com.google.android.gms:play-services-measurement-impl:18.0.2)
     Duplicate class com.google.android.gms.measurement.internal.zzgq found in modules jetified-play-services-measurement-base-18.0.3-runtime (com.google.android.gms:play-services-measurement-base:18.0.3) and jetified-play-services-measurement-impl-18.0.2-runtime (com.google.android.gms:play-services-measurement-impl:18.0.2)
     Duplicate class com.google.android.gms.measurement.internal.zzhs found in modules jetified-play-services-measurement-18.0.2-runtime (com.google.android.gms:play-services-measurement:18.0.2) and jetified-play-services-measurement-base-18.0.3-runtime (com.google.android.gms:play-services-measurement-base:18.0.3)
     Duplicate class com.google.android.gms.measurement.internal.zzhx found in modules jetified-play-services-measurement-base-18.0.3-runtime (com.google.android.gms:play-services-measurement-base:18.0.3) and jetified-play-services-measurement-impl-18.0.2-runtime (com.google.android.gms:play-services-measurement-impl:18.0.2)

     Go to the documentation to learn how to <a href="d.android.com/r/tools/classpath-sync-errors">Fix dependency resolution errors</a>.

By using patch-package to set the play-services-ads version to 17.2.1, we are building again (and shouldn't break from this library in the future).

Optimally, this library should also defer to a safeExtGet for a playServicesVersion specified in the client build.gradle.

[taylorkline]

Today I used patch-package to patch react-native-idfa@4.1.0 for the project I'm working on.

Here is the diff that solved my problem:

diff --git a/node_modules/react-native-idfa/android/build.gradle b/node_modules/react-native-idfa/android/build.gradle
index c697676..6db119e 100644
--- a/node_modules/react-native-idfa/android/build.gradle
+++ b/node_modules/react-native-idfa/android/build.gradle
@@ -44,6 +44,6 @@ android {
 
 dependencies {
     implementation 'com.android.support:appcompat-v7:28.0.0'
-    implementation 'com.google.android.gms:play-services-ads:+'
+    implementation 'com.google.android.gms:play-services-ads:17.2.1'
     implementation 'com.facebook.react:react-native:+'
 }

This issue body was partially generated by patch-package.

[ptomasroos]

Nice addition. A pull request would be nice otherwise to add it to the readme