fastlane crashlytics step: halted compilation - can't extract Crashlytics build info from APK

I’ve seen this reported in multiple places, however cannot seem to find any info regarding a fix.

The full error when trying to run an fastlane flutter build using com.crashlytics.sdk.android:crashlytics:2.9.9@aar is

+------+-----------------------------+-------------+
|                 fastlane summary                 |
+------+-----------------------------+-------------+
| Step | Action                      | Time (in s) |
+------+-----------------------------+-------------+
| 1    | update_fastlane             | 7           |
| 2    | default_platform            | 0           |
| 3    | gradle                      | 4           |
| 4    | flutter build apk           | 75          |
|      | --target\=lib/config/produ  |             |
|      | ction.dart --rele           |             |
| 5    | read_pubspec_version        | 0           |
| 6    | read_changelog              | 0           |
| 💥   | crashlytics                 | 0           |
+------+-----------------------------+-------------+

[14:42:58]: fastlane finished with errors

[!]  WARN - Crashlytics halted compilation because it can't extract Crashlytics build info from the APK: /Users//xxx/xx/xx/build/app/outputs/apk/release/app-release.apk
Exception in thread "main" com.crashlytics.tools.android.exception.PluginException: Distribution upload failed.
        at com.crashlytics.tools.android.DeveloperTools.processProperties(DeveloperTools.java:667)
        at com.crashlytics.tools.android.DeveloperTools.processArgsInternal(DeveloperTools.java:348)
        at com.crashlytics.tools.android.DeveloperTools.main(DeveloperTools.java:273)
Caused by: com.crashlytics.tools.android.exception.DistributionException: Crashlytics halted compilation because it can't extract Crashlytics build info from the APK: /Users/xxx/xx/xxx/build/app/outputs/apk/release/app-release.apk
        at com.crashlytics.tools.android.DistributionTasks.uploadDistribution(DistributionTasks.java:64)
        at com.crashlytics.tools.android.DeveloperTools.processProperties(DeveloperTools.java:665)
        ... 2 more

have followed the exact installation configurations and examples from this repo, but to no avail. it used to work fine.

this happened after we upgraded flutter project for AndroidX doing the following in dependencies

compile('com.crashlytics.sdk.android:crashlytics:2.9.9@aar') {
        transitive = true;
    }

[vnagendra]

Fought the same problem for a few hours. I have two projects one of which was doing just fine and the other was having this issue. Went through app/build.gradle line by line trying to figure out what is going on. Here are some steps for posterity

1. Check to see if crashlytics-build.properties is present in the APK. You’ll need an APK viewer (such as the one bundled with Android Studio).

• This file can be found in the assets folder (inside the APK)
• This file is also generated as an intermediate, which maybe easier to find like so. Execute this find from the project directory (where you can find pubspec.yaml file.

➜  project git:(master) ✗ find build -name crashlytics-build.properties
build/app/intermediates/merged_assets/release/out/crashlytics-build.properties

• Goes without saying, if this isn’t found, it isn’t going to work 😀

1. For some strange reason, version flutter_crashlytics: ^ 0.2.1+1 and flutter_crashlytics: ^1.0.0 both have a dependency on kotlin plugin.

• My project with 0.2.1 happened to be kotlin, because of which I missed this
• So adding apply plugin: 'kotlin-android' in the app/build.gradle magically made this file appear!

I’d be very curious to hear why that is the case, because the example project doesn’t seem to have this dependency at all. I wonder why the example project is working (or why my project wasn’t working).

[zanuka]

adding the apply plugin: 'kotlin-android' to app/build.gradle did the trick, but only with the following in the android build.gradle:

buildscript {
    repositories {
        google()
        jcenter()
        maven { url 'https://maven.fabric.io/public' }
        maven { url 'https://plugins.gradle.org/m2/' }
    }

    dependencies {
        classpath 'io.fabric.tools:gradle:1.+'
        classpath 'com.android.tools.build:gradle:3.3.2'
        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.31'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}