水果电商网站开发方案,wordpress注册直接显示密码错误,搭建平台的高级说法,个人淘宝开店流程步骤Android studio 高版本默认不开启Task配置#xff0c;需要自己手动开启
1.低版本配置路径#xff1a;#xff08;复制他人图片#xff09; 2.高版本路径#xff1a;添加下图勾选配置即可 3.gradle task
3.1 初识task
gradle中所有的构建工作都是由task完成的,它帮我们处…Android studio 高版本默认不开启Task配置需要自己手动开启
1.低版本配置路径复制他人图片 2.高版本路径添加下图勾选配置即可 3.gradle task
3.1 初识task
gradle中所有的构建工作都是由task完成的,它帮我们处理了很多工作,比如编译,打包,发布等都是task.我们可以在项目的根目录下,打开命令行(AS自带,底部有Terminal,打开就行)执行gradlew tasks查看当前项目所有的task.
在命令行如果执行失败,则将项目的JDK location设置成本地jdk的路径,而且jdk的版本还需要是java 8. 我用的jdk版本是1.8.0_231. Task :tasks------------------------------------------------------------
Tasks runnable from root project
------------------------------------------------------------Android tasks
-------------
androidDependencies - Displays the Android dependencies of the project.
signingReport - Displays the signing info for the base and test modules
sourceSets - Prints out all the source sets defined in this project.Build tasks
-----------
assemble - Assemble main outputs for all the variants.
assembleAndroidTest - Assembles all the Test applications.
build - Assembles and tests this project.
buildDependents - Assembles and tests this project and all projects that depend on it.
buildNeeded - Assembles and tests this project and all projects it depends on.
bundle - Assemble bundles for all the variants.
clean - Deletes the build directory.
cleanBuildCache - Deletes the build cache directory.
compileDebugAndroidTestSources
compileDebugSources
compileDebugUnitTestSources
compileReleaseSources
compileReleaseUnitTestSourcesBuild Setup tasks
-----------------
init - Initializes a new Gradle build.
wrapper - Generates Gradle wrapper files.Cleanup tasks
-------------
lintFix - Runs lint on all variants and applies any safe suggestions to the source code.Help tasks
----------
buildEnvironment - Displays all buildscript dependencies declared in root project Hello.
components - Displays the components produced by root project Hello. [incubating]
dependencies - Displays all dependencies declared in root project Hello.
dependencyInsight - Displays the insight into a specific dependency in root project Hello.
dependentComponents - Displays the dependent components of components in root project Hello. [incubating]
help - Displays a help message.
model - Displays the configuration model of root project Hello. [incubating]
projects - Displays the sub-projects of root project Hello.
properties - Displays the properties of root project Hello.
tasks - Displays the tasks runnable from root project Hello (some of the displayed tasks may belong to subprojects).Install tasks
-------------
installDebug - Installs the Debug build.
installDebugAndroidTest - Installs the android (on device) tests for the Debug build.
uninstallAll - Uninstall all applications.
uninstallDebug - Uninstalls the Debug build.
uninstallDebugAndroidTest - Uninstalls the android (on device) tests for the Debug build.
uninstallRelease - Uninstalls the Release build.Verification tasks
------------------
check - Runs all checks.
connectedAndroidTest - Installs and runs instrumentation tests for all flavors on connected devices.
connectedCheck - Runs all device checks on currently connected devices.
connectedDebugAndroidTest - Installs and runs the tests for debug on connected devices.
deviceAndroidTest - Installs and runs instrumentation tests using all Device Providers.
deviceCheck - Runs all device checks using Device Providers and Test Servers.
lint - Runs lint on all variants.
lintDebug - Runs lint on the Debug build.
lintRelease - Runs lint on the Release build.
lintVitalRelease - Runs lint on just the fatal issues in the release build.
test - Run unit tests for all variants.
testDebugUnitTest - Run unit tests for the debug build.
testReleaseUnitTest - Run unit tests for the release build.
To see all tasks and more detail, run gradlew tasks --all可以看到,这里有很多的task.比如我们在命令行执行gradlew clean就是clean.执行gradlew installDebug就是构建debug项目然后安装到手机上.
3.2 编写task
书写task非常简单,比如我们在根目录的build.gradle中加入一个hello的task
task hello() {println hello world//将给定的闭包 添加到此task操作链表的开头doFirst {println hello task doFirst}doLast {println hello task doLast}
}然后在命令行执行gradlew hello,输出如下
setting 开始配置
setting 配置完成 Configure project :
根build.gradle 开始配置
hello world
根build.gradle 配置完成 Configure project :app
app build.gradle 开始配置
app build.gradle 配置完成 Task :hello
hello task doFirst
hello task doLast它会先配置完成,才会执行.在一个task内部其实拥有一个action列表,执行的时候其实就是执行这个列表,它的类型是一个List.上面的doFirst和doLast就是创建action的两个方法,文档.doFirst是在最开始执行,doLast是在最后执行,大括号里面传入的是闭包.
3.3 task执行顺序
task是有执行顺序的,在创建完Android项目之后,根目录下的build.gradle中,有一个clean的task.这个是AS自动给我们生成的.
task clean(type: Delete) {delete rootProject.buildDir
}我们先在根目录下创建test.txt文件,然后我们在这个task中做一些改动,执行到clean这个task时删除根目录下的test.txt文件.
task clean(type: Delete) {delete rootProject.buildDirdoLast {def file new File(test.txt)delete fileprintln 清理}
}然后我们在hello这个task的下面写上
hello.dependsOn clean 这样就表示hello这个task依赖clean这个task,当执行hello这个task时需要先执行clean. 我们在命令行执行gradlew hello看看是不是这样.我执行之后它的输出是 Task :clean 清理 Task :hello hello task doFirst hello task doLast 先执行clean,再执行hello这个task.而且还看到test.txt文件被删除(如果看到没删除,刷新一下看看)了,那么说明确实是clean先执行. 这个顺序有什么用?其实是很有用的,比如执行安装task的时候,肯定会先执行编译,打包这些步骤.
3.4 自带 gradle task
当我们在AS中创建Android项目的时候,默认会带一些Android的一些gradle task,这些task都是gradle和Android Gradle Plugin给我们创建好的,可以直接用. 比如我们上面使用到的gradlew clean是用来清理项目的.和编译相关的task主要有build和assemble其中build依赖assemble也就是说执行build之前会先执行assemble。在Android上会根据buildType和productFlavor的不同自动创建多个assembleXxx任务如assembleDebugassembleRelease等assemble会依赖所有的assembleXxx任务也就是说执行assemble会先执行assembleDebugassembleRelease等一系列的assemble任务。
如果想看Android Gradle Plugin源码,可以在app/build.gradle中的dependencies下面引入
compileOnly com.android.tools.build:gradle:3.5.2然后就可以在项目的External Libraries中看到该jar的源码,
比如clean这个task是在com.android.build.gradle.tasks.CleanBuildCache.java里面定义的
TaskAction
public void clean() throws IOException {Preconditions.checkNotNull(buildCache, buildCache must not be null);buildCache.delete();
}通过查询gradle官方文档可知,TaskAction的作用:Marks a method as the action to run when the task is executed. 将方法标记为执行任务时要运行的动作.
