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Firebase Crashlytics support with Bazel

In order to integrate Crashlytics into your app, Bazel needs to generate configuration files containing information about your Crashlytics setup to include in the final APK.

Ensure that you have a Firebase app with Firebase Crashlytics enabled. For more information, read the Before you begin section on the Firebase Crashlytics documentation.

Also ensure that the google-services.json file is in your project workspace.

To fetch Crashlytics dependencies, use a Maven resolver tool. For the following examples, we will use rules_maven:

In the WORKSPACE, add the Crashlytics and Google Maven repositories, as well as the dependencies:

maven_install(
    artifacts = [
        "com.crashlytics.sdk.android:crashlytics:2.9.8",
        "io.fabric.sdk.android:fabric:1.4.7",
    ],
    repositories = [
        "https://maven.fabric.io/public",
        "https://bintray.com/bintray/jcenter",
        "https://maven.google.com",
        "https://repo1.maven.org/maven2",
    ],
)

In your BUILD file, declare crashlytics_android_library and google_services_xml. For convenience, you can also create an android_library that exports the two artifacts dependencies.

load("@rules_maven//:defs.bzl", "artifact")
load("@tools_android//tools/crashlytics:defs.bzl", "crashlytics_android_library")
load("@tools_android//tools/googleservices:defs.bzl", "google_services_xml")

GOOGLE_SERVICES_RESOURCES = google_services_xml(
    package_name = "com.example.package",
    google_services_json = "google-services.json",
)

crashlytics_android_library(
    name = "crashlytics_lib",
    package_name = "com.example.package",
    build_id = "9dfea8fe4d7548a7ba284ddb7fe74780",
    resource_files = GOOGLE_SERVICES_RESOURCES,
)

android_library(
    name = "crashlytics_deps",
    exports = [
        artifact("com.crashlytics.sdk.android:crashlytics"),
        artifact("io.fabric.sdk.android:fabric"),
    ],
)

To generate the Build ID (which is a UUID without hyphens), we have created a tool called generate_uuid. Run it with Bazel:

$ bazel run @tools_android//tools/crashlytics:generate_uuid

...

76196b855620443581e11c0515e0e271

Finally, depend on the crashlytics_deps and crashlytics_lib libraries.

android_library(
    name = "my_release_lib",
    srcs = glob(["src/main/**/*.java"]),
    manifest = "AndroidManifest.xml",
    resource_files = glob(["res/**/*"]),
    deps = [
        ":crashlytics_lib",
        ":crashlytics_deps", 
    ],
)

To force a crash and find out if Crashlytics is working properly, follow the steps in Crashlytics documentation.