Android Gradle系列-原理篇

 1def printAge(String name, int age) {
 2    print("$name is $age years old")
 3}
 4
 5def printEmptyLine() {
 6    println()
 7}
 8
 9def callClosure(Closure closure) {
10    closure()
11}
12
13printAge "John", 24 //输出John is 24 years old
14printEmptyLine() //输出空行
15callClosure { println("From closure") } //输出From closure

1def callWithParam(String param, Closure<String> closure) {
2    closure(param)
3}
4
5callWithParam("param", { println it }) //输出param
6callWithParam("param") { println it } //输出param
7callWithParam "param", { println it } //输出param

 1def printPersonInfo(Map<String, Object> person) {
 2    println("${person.name} is ${person.age} years old")
 3}
 4
 5def printJobInfo(Map<String, Object> job, String employeeName) {
 6    println("${employeeName} works as ${job.name} at ${job.company}")
 7}
 8
 9printPersonInfo name: "Jake", age: 29
10printJobInfo "Payne", name: "Android Engineer", company: "Google"

 1class DelegateOne {
 2    def callContent(String content) {
 3        println "From delegateOne: $content"
 4    }
 5}
 6
 7class DelegateTow {
 8    def callContent(String content) {
 9        println "From delegateTwo: $content"
10    }
11}
12
13def callClosure = {
14    callContent "I am bird"
15}
16
17callClosure.delegate = new DelegateOne()
18callClosure() //输出From delegateOne: I am bird
19callClosure.delegate = new DelegateTow()
20callClosure() //输出From delegateTow: I am bird

 1$ gradle projects
 2> Task :projects
 3
 4------------------------------------------------------------
 5Root project
 6------------------------------------------------------------
 7
 8Root project 'example'
 9No sub-projects
10
11To see a list of the tasks of a project, run gradle <project-path>:tasks
12For example, try running gradle :tasks
13
14BUILD SUCCESSFUL in 5s

 1$ echo "include ':app'" > settings.gradle
 2$ gradle projects
 3> Task :projects
 4
 5------------------------------------------------------------
 6Root project
 7------------------------------------------------------------
 8
 9Root project 'example'
10\--- Project ':app'
11
12To see a list of the tasks of a project, run gradle <project-path>:tasks
13For example, try running gradle :app:tasks
14
15BUILD SUCCESSFUL in 1s
161 actionable task: 1 executed

1void apply(Closure closure)
2void apply(Map<String, ?> options)
3void apply(Action<? super ObjectConfigurationAction> action)

1$ echo "apply plugin: 'com.android.application'" > app/build.gradle

 1$ gradle app:tasks
 2
 3FAILURE: Build failed with an exception.
 4
 5* Where:
 6Build file '/Users/idisfkj/example/app/build.gradle' line: 1
 7
 8* What went wrong:
 9A problem occurred evaluating project ':app'.
10> Plugin with id 'com.android.application' not found.
11
12* Try:
13Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
14
15* Get more help at https://help.gradle.org
16
17BUILD FAILED in 6s

 1buildscript {
 2    repositories {
 3        google()
 4        jcenter()
 5    }
 6
 7    dependencies {
 8        classpath 'com.android.tools.build:gradle:3.3.2'
 9    }
10}

 1$ gradle projects
 2
 3FAILURE: Build failed with an exception.
 4
 5* What went wrong:
 6A problem occurred configuring project ':app'.
 7> compileSdkVersion is not specified.
 8
 9* Try:
10Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
11
12* Get more help at https://help.gradle.org
13
14BUILD FAILED in 1s

1android {
2   buildToolsVersion "28.0.1"
3   compileSdkVersion 28
4}

 1    @Override
 2    void apply(Project project) {
 3        super.apply(project)
 4        // This is for testing.
 5        if (pluginHolder != null) {
 6            pluginHolder.plugin = this;
 7        }
 8        def buildTypeContainer = project.container(DefaultBuildType,
 9                new BuildTypeFactory(instantiator,  project.fileResolver))
10        def productFlavorContainer = project.container(GroupableProductFlavorDsl,
11                new GroupableProductFlavorFactory(instantiator, project.fileResolver))
12        def signingConfigContainer = project.container(SigningConfig,
13                new SigningConfigFactory(instantiator))
14        extension = project.extensions.create('android', AppExtension,
15                this, (ProjectInternal) project, instantiator,
16                buildTypeContainer, productFlavorContainer, signingConfigContainer)
17        setBaseExtension(extension)
18        ...
19   }

1dependencies {
2    implementation 'io.reactivex.rxjava2:rxjava:2.0.4'
3    testImplementation 'junit:junit:4.12'
4    annotationProcessor 'org.parceler:parceler:1.1.6'
5}

1dependencies {
2    add('implementation', 'io.reactivex.rxjava2:rxjava:2.0.4')
3    add('testImplementation', 'junit:junit:4.12')
4    add('annotationProcessor', 'org.parceler:parceler:1.1.6')
5}