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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 {
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repositories {
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jcenter ( )
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maven {
url 'https://maven.google.com'
}
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}
dependencies {
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classpath 'com.android.tools.build:gradle:3.0.1'
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}
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}
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
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private File flutterJar
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private File flutterX86Jar
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private File debugFlutterJar
private File profileFlutterJar
private File releaseFlutterJar
private Properties readPropertiesIfExist ( File propertiesFile ) {
Properties result = new Properties ( )
if ( propertiesFile . exists ( ) ) {
propertiesFile . withInputStream { stream - > result . load ( stream ) }
}
return result
}
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private String resolveProperty ( Project project , String name , String defaultValue ) {
if ( localProperties = = null ) {
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localProperties = readPropertiesIfExist ( project . rootProject . file ( "local.properties" ) )
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}
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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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if ( it . hasProperty ( 'matchingFallbacks' ) ) {
matchingFallbacks = [ 'debug' , 'release' ]
}
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}
}
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String flutterRootPath = resolveProperty ( project , "flutter.sdk" , System . env . FLUTTER_ROOT )
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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_ROOT 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' )
}
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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 {
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if ( project . getConfigurations ( ) . findByName ( "implementation" ) ) {
implementation project . files ( flutterJar )
} else {
compile project . files ( flutterJar )
}
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}
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} else {
Path baseEnginePath = Paths . get ( flutterRoot . absolutePath , "bin" , "cache" , "artifacts" , "engine" )
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debugFlutterJar = baseEnginePath . resolve ( "android-arm" ) . resolve ( "flutter.jar" ) . toFile ( )
profileFlutterJar = baseEnginePath . resolve ( "android-arm-profile" ) . resolve ( "flutter.jar" ) . toFile ( )
releaseFlutterJar = baseEnginePath . resolve ( "android-arm-release" ) . resolve ( "flutter.jar" ) . toFile ( )
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if ( ! debugFlutterJar . isFile ( ) ) {
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project . exec {
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executable flutterExecutable . absolutePath
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args "--suppress-analytics"
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args "precache"
}
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if ( ! debugFlutterJar . isFile ( ) ) {
throw new GradleException ( "Unable to find flutter.jar in SDK: ${debugFlutterJar}" )
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}
}
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// Add x86/x86_64 native library. Debug mode only, for now.
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flutterX86Jar = project . file ( "${project.buildDir}/${AndroidProject.FD_INTERMEDIATES}/flutter/flutter-x86.jar" )
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project . tasks . create ( "flutterBuildX86Jar" , Jar ) {
destinationDir flutterX86Jar . parentFile
archiveName flutterX86Jar . name
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from ( "${flutterRoot}/bin/cache/artifacts/engine/android-x86/libflutter.so" ) {
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into "lib/x86"
}
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from ( "${flutterRoot}/bin/cache/artifacts/engine/android-x64/libflutter.so" ) {
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into "lib/x86_64"
}
}
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// Add flutter.jar dependencies to all <buildType>Implementation configurations, including custom ones
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// added after applying the Flutter plugin.
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project . android . buildTypes . each { addFlutterJarImplementationDependency ( project , it ) }
project . android . buildTypes . whenObjectAdded { addFlutterJarImplementationDependency ( project , it ) }
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}
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project . extensions . create ( "flutter" , FlutterExtension )
project . afterEvaluate this . & addFlutterTask
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File pluginsFile = new File ( project . rootProject . projectDir . parentFile , '.flutter-plugins' )
Properties plugins = readPropertiesIfExist ( pluginsFile )
plugins . each { name , _ - >
def pluginProject = project . rootProject . findProject ( ":$name" )
if ( pluginProject ! = null ) {
project . dependencies {
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if ( project . getConfigurations ( ) . findByName ( "implementation" ) ) {
implementation pluginProject
} else {
compile pluginProject
}
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}
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pluginProject . afterEvaluate this . & addFlutterJarCompileOnlyDependency
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} else {
project . logger . error ( "Plugin project :$name not found. Please update settings.gradle." )
}
}
}
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private void addFlutterJarCompileOnlyDependency ( Project project ) {
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if ( project . state . failure ) {
return
}
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project . dependencies {
if ( flutterJar ! = null ) {
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if ( project . getConfigurations ( ) . findByName ( "compileOnly" ) ) {
compileOnly project . files ( flutterJar )
} else {
provided project . files ( flutterJar )
}
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} else {
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if ( project . getConfigurations ( ) . findByName ( "debugCompileOnly" ) ) {
debugCompileOnly project . files ( debugFlutterJar )
releaseCompileOnly project . files ( releaseFlutterJar )
} else {
debugProvided project . files ( debugFlutterJar )
releaseProvided project . files ( releaseFlutterJar )
}
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}
}
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}
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/ * *
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* Adds suitable flutter . jar implementation dependencies to the specified buildType .
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*
* Note: The BuildType DSL type is not public , and is therefore omitted from the signature .
* /
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private void addFlutterJarImplementationDependency ( Project project , buildType ) {
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project . dependencies {
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String configuration ;
if ( project . getConfigurations ( ) . findByName ( "implementation" ) ) {
configuration = buildType . name + "Implementation" ;
} else {
configuration = buildType . name + "Compile" ;
}
add ( configuration , project . files {
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String buildMode = buildModeFor ( buildType )
if ( buildMode = = "debug" ) {
[ flutterX86Jar , debugFlutterJar ]
} else if ( buildMode = = "profile" ) {
profileFlutterJar
} else {
releaseFlutterJar
}
} )
}
}
/ * *
* Returns a Flutter build mode suitable for the specified Android buildType .
*
* Note: The BuildType DSL type is not public , and is therefore omitted from the signature .
*
* @return "debug" , "profile" , or "release" ( fall - back ) .
* /
private static String buildModeFor ( buildType ) {
if ( buildType . name = = "profile" ) {
return "profile"
} else if ( buildType . debuggable ) {
return "debug"
}
return "release"
}
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private void addFlutterTask ( Project project ) {
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if ( project . state . failure ) {
return
}
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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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Boolean previewDart2Value = false
if ( project . hasProperty ( 'preview-dart-2' ) ) {
previewDart2Value = project . property ( 'preview-dart-2' )
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}
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Boolean strongModeValue = false
if ( project . hasProperty ( 'strong' ) ) {
strongModeValue = project . property ( 'strong' )
}
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String extraFrontEndOptionsValue = null
if ( project . hasProperty ( 'extra-front-end-options' ) ) {
extraFrontEndOptionsValue = project . property ( 'extra-front-end-options' )
}
String extraGenSnapshotOptionsValue = null
if ( project . hasProperty ( 'extra-gen-snapshot-options' ) ) {
extraGenSnapshotOptionsValue = project . property ( 'extra-gen-snapshot-options' )
}
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Boolean preferSharedLibraryValue = false
if ( project . hasProperty ( 'prefer-shared-library' ) ) {
preferSharedLibraryValue = project . property ( 'prefer-shared-library' )
}
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project . android . applicationVariants . all { variant - >
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String flutterBuildMode = buildModeFor ( variant . buildType )
if ( flutterBuildMode = = 'debug' & & project . tasks . findByName ( 'flutterBuildX86Jar' ) ) {
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Task task = project . tasks . findByName ( "compile${variant.name.capitalize()}JavaWithJavac" )
if ( task ) {
task . dependsOn project . flutterBuildX86Jar
}
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task = project . tasks . findByName ( "compile${variant.name.capitalize()}Kotlin" )
if ( task ) {
task . dependsOn project . flutterBuildX86Jar
}
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}
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GenerateDependencies dependenciesTask = project . tasks . create ( name: "flutterDependencies${variant.name.capitalize()}" , type: GenerateDependencies ) {
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flutterRoot this . flutterRoot
flutterExecutable this . flutterExecutable
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buildMode flutterBuildMode
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localEngine this . localEngine
localEngineSrcPath this . localEngineSrcPath
targetPath target
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previewDart2 previewDart2Value
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strongMode strongModeValue
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preferSharedLibrary preferSharedLibraryValue
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sourceDir project . file ( project . flutter . source )
intermediateDir project . file ( "${project.buildDir}/${AndroidProject.FD_INTERMEDIATES}/flutter/${variant.name}" )
}
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FlutterTask flutterTask = project . tasks . create ( name: "flutterBuild${variant.name.capitalize()}" , type: FlutterTask ) {
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dependsOn dependenciesTask
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flutterRoot this . flutterRoot
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flutterExecutable this . flutterExecutable
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buildMode flutterBuildMode
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localEngine this . localEngine
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localEngineSrcPath this . localEngineSrcPath
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targetPath target
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previewDart2 previewDart2Value
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strongMode strongModeValue
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preferSharedLibrary preferSharedLibraryValue
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sourceDir project . file ( project . flutter . source )
intermediateDir project . file ( "${project.buildDir}/${AndroidProject.FD_INTERMEDIATES}/flutter/${variant.name}" )
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extraFrontEndOptions extraFrontEndOptionsValue
extraGenSnapshotOptions extraGenSnapshotOptionsValue
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}
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Task copyFlxTask = project . tasks . create ( name: "copyFlutterAssets${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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}
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abstract class BaseFlutterTask 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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@Optional @Input
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Boolean previewDart2
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@Optional @Input
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Boolean strongMode
@Optional @Input
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Boolean preferSharedLibrary
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File sourceDir
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File intermediateDir
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@Optional @Input
String extraFrontEndOptions
@Optional @Input
String extraGenSnapshotOptions
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@OutputFile
File getDependenciesFile ( ) {
if ( buildMode ! = 'debug' ) {
return project . file ( "${intermediateDir}/snapshot.d" )
}
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return project . file ( "${intermediateDir}/snapshot_blob.bin.d" )
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}
void buildFlx ( ) {
if ( ! sourceDir . isDirectory ( ) ) {
throw new GradleException ( "Invalid Flutter source directory: ${sourceDir}" )
}
intermediateDir . mkdirs ( )
if ( buildMode ! = "debug" ) {
project . exec {
executable flutterExecutable . absolutePath
workingDir sourceDir
if ( localEngine ! = null ) {
args "--local-engine" , localEngine
args "--local-engine-src-path" , localEngineSrcPath
}
args "build" , "aot"
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args "--suppress-analytics"
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args "--quiet"
args "--target" , targetPath
args "--target-platform" , "android-arm"
args "--output-dir" , "${intermediateDir}"
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if ( previewDart2 ) {
args "--preview-dart-2"
}
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if ( strongMode ) {
args "--strong"
}
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if ( extraFrontEndOptions ! = null ) {
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args "--extra-front-end-options" , "${extraFrontEndOptions}"
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}
if ( extraGenSnapshotOptions ! = null ) {
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args "--extra-gen-snapshot-options" , "${extraGenSnapshotOptions}"
}
if ( preferSharedLibrary ) {
args "--prefer-shared-library"
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}
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args "--${buildMode}"
}
}
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project . exec {
executable flutterExecutable . absolutePath
workingDir sourceDir
if ( localEngine ! = null ) {
args "--local-engine" , localEngine
args "--local-engine-src-path" , localEngineSrcPath
}
args "build" , "flx"
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args "--suppress-analytics"
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args "--target" , targetPath
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if ( previewDart2 ) {
args "--preview-dart-2"
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}
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if ( strongMode ) {
args "--strong"
}
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args "--output-file" , "${intermediateDir}/app.flx"
if ( buildMode ! = "debug" ) {
args "--precompiled"
} else {
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if ( ! previewDart2 ) {
args "--snapshot" , "${intermediateDir}/snapshot_blob.bin"
args "--depfile" , "${intermediateDir}/snapshot_blob.bin.d"
}
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}
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args "--working-dir" , "${intermediateDir}/flutter_assets"
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}
}
}
class GenerateDependencies extends BaseFlutterTask {
@TaskAction
void build ( ) {
File dependenciesFile = getDependenciesFile ( ) ;
if ( ! dependenciesFile . exists ( ) ) {
buildFlx ( )
}
}
}
class FlutterTask extends BaseFlutterTask {
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@OutputDirectory
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File getOutputDirectory ( ) {
return intermediateDir
}
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CopySpec getAssets ( ) {
return project . copySpec {
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from "${intermediateDir}"
include "flutter_assets/**" // the working dir and its files
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if ( buildMode ! = 'debug' ) {
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if ( preferSharedLibrary ) {
include "${intermediateDir}/app.so"
} else {
include "vm_snapshot_data"
include "vm_snapshot_instr"
include "isolate_snapshot_data"
include "isolate_snapshot_instr"
}
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}
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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}: ${e}" )
}
}
return null
}
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@InputFiles
FileCollection getSourceFiles ( ) {
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File dependenciesFile = getDependenciesFile ( )
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FileCollection sources = readDependencies ( dependenciesFile )
if ( sources ! = null ) {
// We have a dependencies file. Add a dependency on gen_snapshot as well, since the
// snapshots have to be rebuilt if it changes.
FileCollection snapshotter = readDependencies ( project . file ( "${intermediateDir}/gen_snapshot.d" ) )
if ( snapshotter ! = null ) {
sources = sources . plus ( snapshotter )
}
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if ( localEngineSrcPath ! = null ) {
sources = sources . plus ( project . files ( "$localEngineSrcPath/$localEngine" ) )
}
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// 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 ( ) {
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buildFlx ( )
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}
}