https://github.com/KeepSafe/dexcount-gradle-plugin
A Gradle plugin to report the number of method references in your APK or AAR on every build.
This helps you keep tabs on the growth of your app, with an eye to staying under the 65,536 method-reference limit, and avoiding the headache of eliminating methods or enabling multidex.
Usage
in app/build.gradle
buildscript {
repositories {
mavenCentral() // or jcenter()
}
dependencies {
classpath ‘com.getkeepsafe.dexcount:dexcount-gradle-plugin:0.7.1‘
}
}
// make sure this line comes *after* you apply the Android plugin
apply plugin: ‘com.getkeepsafe.dexcount‘
Note
dexcount-gradle-plugin "requires" Java 8 to run. "Requires" means that, while it will technically work if Gradle is being run on Java 7, there are situations where it may crash. This is caused by dependencies we don‘t bundle targeting JRE 8; these cannot be loaded on older runtimes. Attempting to load them will crash Gradle. This currently applies only to counting .aar library projects, but as time goes by the JRE-8-only surface area will only increase.
Sample output
> ./gradlew assembleDebug
...buildspam...
:app:compileDebugSources
:app:preDexDebug UP-TO-DATE
:app:dexDebug
:app:packageDebug
:app:zipalignDebug
:app:assembleDebug
Total methods in MyApp-debug.apk: 58930 (89.92% used)
Total fields in MyApp-debug.apk: 27507 (41.97% used)
Methods remaining in MyApp-debug.apk: 6605
Fields remaining in MyApp-debug.apk: 38028
BUILD SUCCESSFUL
Total time: 33.017 secs
Detailed method counts
By default, a breakdown of method references by package and class will be written to a file under ${buildDir}/outputs/dexcount/${variant}.
For example, an excerpt from our own app (in app/build/outputs/dexcount/debug.txt):
methods fields package/class name
5037 1103 android.support.v4
29 1 android.support.v4.accessibilityservice
57 16 android.support.v4.animation
931 405 android.support.v4.app
87 31 android.support.v4.content
139 12 android.support.v4.graphics
116 11 android.support.v4.graphics.drawable
74 9 android.support.v4.internal
74 9 android.support.v4.internal.view
194 35 android.support.v4.media
11 0 android.support.v4.media.routing
156 26 android.support.v4.media.session
Configuration
Dexcount is configurable via a Gradle extension (shown with default values):
in app/build.gradle:
dexcount {
format = "list"
includeClasses = false
includeClassCount = false
includeFieldCount = true
includeTotalMethodCount = false
orderByMethodCount = false
verbose = false
maxTreeDepth = Integer.MAX_VALUE
teamCityIntegration = false
teamCitySlug = null
runOnEachPackage = true
maxMethodCount = 64000
}
Each flag controls some aspect of the printed output:
format: The format of the method count output, either "list", "tree", "json", or "yaml".includeClasses: When true, individual classes will be include in the package list - otherwise, only packages are included.includeClassCount: When true, the number of classes in a package will be included in the printed output.includeFieldCount: When true, the number of fields in a package or class will be included in the printed output.includeTotalMethodCount: When true, the total number of methods in the application will be included in the printed output.orderByMethodCount: When true, packages will be sorted in descending order by the number of methods they contain.verbose: When true, the output file will also be printed to the build‘s standard output.maxTreeDepth: Sets the max number of package segments in the output - i.e. when set to 2, counts stop atcom.google, when set to 3 you getcom.google.android, etc. "Unlimited" by default.teamCityIntegration: When true, Team City integration strings will be printed.teamCitySlug: A string which, if specified, will be added to TeamCity stat names. Null by default.runOnEachPackage: When false, does not run count method during package task. True by default. Synonym forrunOnEachAssemble, which is deprecated.maxMethodCount: When set, the build will fail when the APK/AAR has more methods than the max. 0 by default.
Use with Jenkins Plot Plugin
A common use-case is to plot method and field counts across builds. The Jenkins Plot plugin is a general-purpose tool that graphs per-build scalar values through time. It reads java .properties files, CSV files, and XML files. Dexcount generates two files for each variant - a full package list, and a summary CSV file. The summary file is usable as-is with the Jenkins Plot Plugin. You can find it in app/build/outputs/variant.csv (note the .csv extension).
Consult the plugin documentation for details on how to configure it.
Use with Team City
Common case is to enable integration with teamCityIntegration option and add custom statistic graphs in Team City. Key name is generated by pattern DexCount_${variant}_ClassCount, DexCount_${variant}_MethodCount and DexCount_${variant}_FieldCount
Technically special strings like ##teamcity[buildStatisticValue key=‘DexCount_universalDebug_MethodCount‘ value=‘62362‘] will be printed.
More about integration in Team City doc
If you have multiple products within one project using Dexcount, the default stat names will conflict with each other. In this case, the teamCitySlug configuration option can be useful. It is a string that, if specified, will be added to stat names according to the following scheme: DexCount_${teamCitySlug}_${variant}_${statName}. Note that you can assign a dynamically-evaluated property, e.g. teamCitySlug = project.name.
Note on Instant Run
dexcount-gradle-plugin does not count methods for Instant Run builds in Android Studio. Instant Run is implemented in such a way that it makes method counts very inaccurate. As of build-tools version 3.0.0, it is no longer possible to access the complete incrementally-built APK at all. For these reasons, Instant Run is not supported.
Snapshot Builds
We host snapshots in the Sonatype OSS repo. They are updated on each commit. As snapshots, they are inherently unstable - use at your own risk! To use them, add the Sonatype Snapshot repo to your repositories:
buildscript {
repositories {
// other repos should come first
maven { url ‘https://oss.sonatype.org/content/repositories/snapshots‘ }
}
dependencies {
classpath ‘com.getkeepsafe.dexcount:dexcount-gradle-plugin:0.7.2-SNAPSHOT‘
}
}
Building
./gradlew build
Pushing artifacts to Sonatype requires membership in the KeepSafe Sonatype org, which is by employment only. Once you have a login, put it in your private global Gradle file (e.g. ~/.gradle/gradle.properties, along with a valid GPG signing configuration.
Minutia
This plugin creates a task per output, per variant, and configures each task to run after that variant‘s package task. This means that if the package task does not run, no method count will be reported. This also means that counts are done after Proguard is run, if minification is enabled. Dexcount will use the resulting mapping file to de-obfuscate class and package names.
Credits
The Java code from the com.android.dexdeps package is sourced from the Android source tree. Inspired by Mihail Parparita‘s dex-method-counts project, to whom much credit is due.
Copyright 2015-2017 Keepsafe Software, Inc