同时集成OneSignal与Crashlytics出现构建错误，求排查建议

Hey there, let's work through this build error issue together—since your project worked fine with Crashlytics before adding OneSignal, version conflicts are definitely a prime suspect. Here's a step-by-step breakdown to diagnose and fix this:

• First, grab the exact build error details
  Don't just rely on the top-level error message—check the full Gradle Console output. Look for keywords like Program type already present, Duplicate class, or explicit dependency conflict warnings. These will point you directly to which libraries are clashing.

• Inspect your full dependency tree
  Run this Gradle command in your project root to see all transitive dependencies (the libraries pulled in indirectly by your direct dependencies):

  # macOS/Linux
  ./gradlew app:dependencies
  
  # Windows
  gradlew.bat app:dependencies
  

  Look for overlaps between Crashlytics (now part of Firebase) and OneSignal's dependencies. For example, OneSignal 3.8.4 might pull in a specific version of com.google.firebase:firebase-messaging or com.google.android.gms:play-services-base that conflicts with the versions your Crashlytics setup uses.

• Force conflicting libraries to use a unified version
  If you spot version mismatches, use Gradle's resolution strategy to lock in a single compatible version. Add this block inside your android section in the app-level build.gradle:

  android {
      // ... your existing configuration
      configurations.all {
          resolutionStrategy {
              // Replace these versions with the ones confirmed compatible via your dependency tree
              force 'com.google.android.gms:play-services-base:15.0.0'
              force 'com.google.firebase:firebase-messaging:17.3.4'
          }
      }
  }
  

  Make sure to use versions that align with both Crashlytics and OneSignal's requirements.

• Fix incomplete dependencies first
  Your listed dependency com.adjust.sdk:adjust-a... is truncated. Replace this with the full, valid dependency string (e.g., com.adjust.sdk:adjust-android:4.22.0). An incomplete dependency can cause unexpected build failures that might be masking the actual conflict.

• Clean and rebuild your project
  Gradle cache can sometimes cause weird, non-reproducible errors. Run this command to clear the cache:

  ./gradlew clean
  

  Then rebuild your project to rule out cached issues.

• Check OneSignal-Crashlytics compatibility
  Older versions of OneSignal (like 3.8.4) might have specific compatibility constraints with Firebase/Crashlytics versions. If the above steps don't resolve the issue, cross-check the OneSignal 3.8.4 documentation for any noted compatibility notes with Firebase libraries.

内容的提问来源于stack exchange，提问作者The MJ