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import java.nio.file.Path
import java.nio.file.Paths
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import com.android.builder.model.AndroidProject
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import org.apache.tools.ant.taskdefs.condition.Os
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import org.gradle.api.DefaultTask
import org.gradle.api.GradleException
import org.gradle.api.Project
import org.gradle.api.Plugin
import org.gradle.api.Task
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import org.gradle.api.file.CopySpec
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import org.gradle.api.file.FileCollection
import org.gradle.api.tasks.Copy
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import org.gradle.api.tasks.InputFiles
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import org.gradle.api.tasks.OutputDirectory
import org.gradle.api.tasks.TaskAction
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import org.gradle.api.tasks.bundling.Jar
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buildscript {
repositories {
jcenter ( )
}
dependencies {
classpath 'com.android.tools.build:gradle:2.2.3'
}
}
apply plugin: FlutterPlugin
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class FlutterPlugin implements Plugin < Project > {
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private File flutterRoot
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private File flutterExecutable
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private String localEngine
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private String localEngineSrcPath
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private Properties localProperties
private String resolveProperty ( Project project , String name , String defaultValue ) {
if ( localProperties = = null ) {
localProperties = new Properties ( )
def localPropertiesFile = project . rootProject . file ( "local.properties" )
if ( localPropertiesFile . exists ( ) ) {
localProperties . load ( localPropertiesFile . newDataInputStream ( ) )
}
}
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String result
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if ( project . hasProperty ( name ) ) {
result = project . property ( name )
}
if ( result = = null ) {
result = localProperties . getProperty ( name )
}
if ( result = = null ) {
result = defaultValue
}
return result
}
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@Override
void apply ( Project project ) {
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// Add a 'profile' build type
project . android . buildTypes {
profile {
initWith debug
}
}
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String flutterRootPath = resolveProperty ( project , "flutter.sdk" , System . env . FLUTTER_HOME )
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if ( flutterRootPath = = null ) {
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throw new GradleException ( "Flutter SDK not found. Define location with flutter.sdk in the local.properties file or with a FLUTTER_HOME environment variable." )
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}
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flutterRoot = project . file ( flutterRootPath )
if ( ! flutterRoot . isDirectory ( ) ) {
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throw new GradleException ( "flutter.sdk must point to the Flutter SDK directory" )
}
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String flutterExecutableName = Os . isFamily ( Os . FAMILY_WINDOWS ) ? "flutter.bat" : "flutter"
flutterExecutable = Paths . get ( flutterRoot . absolutePath , "bin" , flutterExecutableName ) . toFile ( ) ;
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if ( project . hasProperty ( 'localEngineOut' ) ) {
String engineOutPath = project . property ( 'localEngineOut' )
File engineOut = project . file ( engineOutPath )
if ( ! engineOut . isDirectory ( ) ) {
throw new GradleException ( 'localEngineOut must point to a local engine build' )
}
File flutterJar = Paths . get ( engineOut . absolutePath , "flutter.jar" ) . toFile ( )
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if ( ! flutterJar . isFile ( ) ) {
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throw new GradleException ( 'Local engine build does not contain flutter.jar' )
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}
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localEngine = engineOut . name
localEngineSrcPath = engineOut . parentFile . parent
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project . dependencies {
compile project . files ( flutterJar )
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}
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} else {
Path baseEnginePath = Paths . get ( flutterRoot . absolutePath , "bin" , "cache" , "artifacts" , "engine" )
File debugFlutterJar = baseEnginePath . resolve ( "android-arm" ) . resolve ( "flutter.jar" ) . toFile ( )
File profileFlutterJar = baseEnginePath . resolve ( "android-arm-profile" ) . resolve ( "flutter.jar" ) . toFile ( )
File releaseFlutterJar = baseEnginePath . resolve ( "android-arm-release" ) . resolve ( "flutter.jar" ) . toFile ( )
if ( ! debugFlutterJar . isFile ( ) ) {
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project . exec {
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executable flutterExecutable . absolutePath
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args "precache"
}
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if ( ! debugFlutterJar . isFile ( ) ) {
throw new GradleException ( "Unable to find flutter.jar in SDK: ${debugFlutterJar}" )
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}
}
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// Add x86/x86_64 native library. Debug mode only, for now.
File flutterX86Jar = project . file ( "${project.buildDir}/${AndroidProject.FD_INTERMEDIATES}/flutter/flutter-x86.jar" )
project . tasks . create ( "flutterBuildX86Jar" , Jar ) {
destinationDir flutterX86Jar . parentFile
archiveName flutterX86Jar . name
from ( "${flutterRoot}/bin/cache/artifacts/engine/android-x86/libsky_shell.so" ) {
into "lib/x86"
}
from ( "${flutterRoot}/bin/cache/artifacts/engine/android-x64/libsky_shell.so" ) {
into "lib/x86_64"
}
}
project . dependencies {
debugCompile project . files ( flutterX86Jar , debugFlutterJar )
profileCompile project . files ( profileFlutterJar )
releaseCompile project . files ( releaseFlutterJar )
}
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}
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project . extensions . create ( "flutter" , FlutterExtension )
project . afterEvaluate this . & addFlutterTask
}
private void addFlutterTask ( Project project ) {
if ( project . flutter . source = = null ) {
throw new GradleException ( "Must provide Flutter source directory" )
}
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String target = project . flutter . target
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if ( target = = null ) {
target = 'lib/main.dart'
}
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if ( project . hasProperty ( 'target' ) ) {
target = project . property ( 'target' )
}
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if ( project . tasks . findByName ( 'flutterBuildX86Jar' ) ) {
project . compileDebugJavaWithJavac . dependsOn project . flutterBuildX86Jar
}
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project . android . applicationVariants . all { variant - >
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if ( ! [ "debug" , "profile" , "release" ] . contains ( variant . name ) ) {
throw new GradleException ( "Build variant must be one of \"debug\", \"profile\", or \"release\" but was \"${variant.name}\"" )
}
FlutterTask flutterTask = project . tasks . create ( "flutterBuild${variant.name.capitalize()}" , FlutterTask ) {
flutterRoot this . flutterRoot
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flutterExecutable this . flutterExecutable
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buildMode variant . name
localEngine this . localEngine
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localEngineSrcPath this . localEngineSrcPath
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targetPath target
sourceDir project . file ( project . flutter . source )
intermediateDir project . file ( "${project.buildDir}/${AndroidProject.FD_INTERMEDIATES}/flutter/${variant.name}" )
}
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Task copyFlxTask = project . tasks . create ( name: "copyFlutterAssets${variant.name.capitalize()}" , type: Copy ) {
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dependsOn flutterTask
dependsOn variant . mergeAssets
into variant . mergeAssets . outputDir
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with flutterTask . assets
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}
variant . outputs [ 0 ] . processResources . dependsOn ( copyFlxTask )
}
}
}
class FlutterExtension {
String source
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String target
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}
class FlutterTask extends DefaultTask {
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File flutterRoot
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File flutterExecutable
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String buildMode
String localEngine
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String localEngineSrcPath
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@Input
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String targetPath
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File sourceDir
@OutputDirectory
File intermediateDir
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CopySpec getAssets ( ) {
return project . copySpec {
from "${intermediateDir}/app.flx"
if ( buildMode ! = 'debug' ) {
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from "${intermediateDir}/vm_snapshot_data"
from "${intermediateDir}/vm_snapshot_instr"
from "${intermediateDir}/isolate_snapshot_data"
from "${intermediateDir}/isolate_snapshot_instr"
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}
}
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}
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FileCollection readDependencies ( File dependenciesFile ) {
if ( dependenciesFile . exists ( ) ) {
try {
// Dependencies file has Makefile syntax:
// <target> <files>: <source> <files> <separated> <by> <space>
String depText = dependenciesFile . text
return project . files ( depText . split ( ': ' ) [ 1 ] . split ( ) )
} catch ( Exception e ) {
logger . error ( "Error reading dependency file ${dependenciesFile}: ${e}" )
}
}
return null
}
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@InputFiles
FileCollection getSourceFiles ( ) {
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File dependenciesFile
if ( buildMode ! = 'debug' ) {
dependenciesFile = project . file ( "${intermediateDir}/snapshot.d" )
} else {
dependenciesFile = project . file ( "${intermediateDir}/snapshot_blob.bin.d" )
}
FileCollection sources = readDependencies ( dependenciesFile )
if ( sources ! = null ) {
// We have a dependencies file. Add a dependency on gen_snapshot as well, since the
// snapshots have to be rebuilt if it changes.
FileCollection snapshotter = readDependencies ( project . file ( "${intermediateDir}/gen_snapshot.d" ) )
if ( snapshotter ! = null ) {
sources = sources . plus ( snapshotter )
}
// Finally, add a dependency on pubspec.yaml as well.
return sources . plus ( project . files ( 'pubspec.yaml' ) )
}
// No dependencies file (or problems parsing it). Fall back to source files.
return project . fileTree (
dir: sourceDir ,
exclude: [ 'android' , 'ios' ] ,
include: [ '**/*.dart' , 'pubspec.yaml' ]
)
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}
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@TaskAction
void build ( ) {
if ( ! sourceDir . isDirectory ( ) ) {
throw new GradleException ( "Invalid Flutter source directory: ${sourceDir}" )
}
intermediateDir . mkdirs ( )
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if ( buildMode ! = "debug" ) {
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project . exec {
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executable flutterExecutable . absolutePath
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workingDir sourceDir
if ( localEngine ! = null ) {
args "--local-engine" , localEngine
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args "--local-engine-src-path" , localEngineSrcPath
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}
args "build" , "aot"
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args "--quiet"
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args "--target" , targetPath
args "--target-platform" , "android-arm"
args "--output-dir" , "${intermediateDir}"
args "--${buildMode}"
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}
}
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project . exec {
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executable flutterExecutable . absolutePath
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workingDir sourceDir
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if ( localEngine ! = null ) {
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args "--local-engine" , localEngine
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args "--local-engine-src-path" , localEngineSrcPath
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}
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args "build" , "flx"
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args "--target" , targetPath
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args "--output-file" , "${intermediateDir}/app.flx"
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args "--no-include-roboto-fonts"
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if ( buildMode ! = "debug" ) {
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args "--precompiled"
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} else {
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args "--snapshot" , "${intermediateDir}/snapshot_blob.bin"
args "--depfile" , "${intermediateDir}/snapshot_blob.bin.d"
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}
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args "--working-dir" , "${intermediateDir}/flx"
}
}
}