Android Studio build works, Gradle command line fails - android-studio

Question

I have ported an app from Eclipse to Android Studio, implemented my needed flavors and have it allow working in Android Studio. Due to the number of flavors I would prefer to build it using command line Gradle. However when I run the following command to build my release APKs
gradlew.bat assembleRelease
I get the following error:
FAILURE: Build failed with an exception.
* Where:
Build file 'C:\whatever\build.gradle' line: 1
* What went wrong:
A problem occurred evaluating project ':MyCompany'.
> java.lang.UnsupportedClassVersionError: com/android/build/gradle/AppPlugin : Unsupported major.minor version 52.0
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
I have run with --stacktrace and --debug and it really does not offer any other information, other than pointing the error to be with the first line of the build.gradle:
apply plugin: 'com.android.application'
I have attempted the following based on other stackoverflow responses to this error:
Upgraded to JavaVersion.VERSION_1_8
Added Jack the build.gradle (and that slowed everything down, but it was required for 1.8, even though it is deprecated?)
Increased memory for heap (org.gradle.jvmargs=-Xmx4096m) and dex (javaMaxHeapSize "4g").
I am running Android Studio 2.3.3
Here is my build.gradle file. I have left only a couple of the flavors to save space, and renamed some of the stuff to protect the innocent. I have left in the dependencies in case that might be the problem? The only funkiness is that I am renaming the APK and pushing it to a different folder, but that is all working when I run the release build directly out of Android Studio. The build.gradle:
apply plugin: 'com.android.application'
apply plugin: 'io.fabric'
buildscript {
repositories {
maven { url 'https://maven.fabric.io/public' }
}
dependencies {
classpath 'io.fabric.tools:gradle:1.+'
}
}
repositories {
maven { url 'https://maven.fabric.io/public' }
}
android {
signingConfigs {
config {
keyAlias 'whatever'
keyPassword 'imnotgoingtotellyou'
storeFile file('C:/whereever/mycompany.keystore')
storePassword 'yeps'
}
}
compileSdkVersion 25
buildToolsVersion '25.0.3'
defaultConfig {
jackOptions {
enabled true
additionalParameters('jack.incremental': 'true')
}
applicationId "com.mycompany.default"
minSdkVersion 14
targetSdkVersion 23
versionCode 44
versionName "2.1.44"
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8 }
signingConfig signingConfigs.config
}
dexOptions {
javaMaxHeapSize "4g"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
signingConfig signingConfigs.config
}
}
productFlavors.whenObjectAdded { flavor ->
flavor.ext.set('directoryPath', '')
flavor.ext.set('apkName', '')
}
productFlavors {
Flavor1 {
signingConfig signingConfigs.config
directoryPath = 'flavor1'
}
Flavor2 {
applicationId 'com.mycompany.flavor2'
signingConfig signingConfigs.config
directoryPath = 'flavor2'
}
applicationVariants.all { variant ->
variant.outputs.each { output ->
def path = "C:/AndroidBuilds/MyBuild.Build/" + variant.productFlavors[0].directoryPath + "/"
logger.error("Path = " + path)
def SEP = "-"
def apkName = variant.productFlavors[0].apkName
def flavor = variant.productFlavors[0].name
if (apkName != '')
flavor = apkName;
def version = variant.versionCode
def newApkName = path + version + SEP + flavor
logger.error("newApkName = " + newApkName)
output.outputFile = new File(newApkName + ".apk")
}
}
}
dependencies {
compile project(':androidpdfview100')
compile 'com.android.support:support-v13:25.3.1'
compile 'com.google.code.gson:gson:2.7'
compile 'joda-time:joda-time:2.5'
compile 'com.google.android.gms:play-services-maps:11.0.4'
compile files('libs/httpmime-4.2.5.jar')
compile files('libs/itextg-5.4.4.jar')
compile files('libs/js.jar')
compile files('libs/logentries-android-2.1.1.jar')
compile files('libs/universal-image-loader-1.8.6.jar')
compile files('libs/xmlworker-5.4.4.jar')
compile files('libs/zbar.jar')
compile('com.crashlytics.sdk.android:crashlytics:2.6.8#aar') {
transitive = true;
}
}
UPDATE
The project structure looks like this:
It was generated automatically by Android Studio when I ported the code from Eclipse:
When you drill into the App itself it looks like this:

Answer 1

For anyone facing this issue in the future, for the command line build make sure your JAVA_HOME is set to the same version as Android Studio is using. E.g. JDK v8:
JAVA_HOME=C:\Program Files\Java\jdk1.8.0_112
Or wherever your 1.8 JDK is. It is a beast and sucks up memory, but it was the only way to get around this build error. I would NOT recommend that you build in Android Studio with 1.8 since it seems to require Jack which is just plain slow. And sadly it is deprecated to boot.

Answer 2

I work on macOS with Zsh as my shell and have just downloaded Android Studio 3.6.2.
I added the following to my ~/.zshenv file, and everything worked.
export JAVA_HOME="/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home"
I believe updating ~/.profile would do it as well, but I haven't tried it.