Android Gradle custom Tasks

Groovy is a dynamic language that is similar to Java (an improved version of Java, but with scripting features) and runs inside the Java Virtual machine. When a Groovy script is run, it is compiled into Java class bytecode, which is then executed by the JVM virtual machine.

For groovy, step here: Groovy uses full parsing

• Format:

{//do some things}Copy the code

• example

build.gradle

Hello task hello{println "hello world"} Name hello task(hello2){println "hello world2"} // define task, name hello3 task('hello3'){println "hello world3"}Copy the code

• Run the gradle command on your terminal

Hello2 task gradlew hello2 task gradlew hello3 task gradlew hello3Copy the code

// Add Action Task doFirst(Action<? super Task> action); Task doFirst(Closure action); // Add Action Task doLast(Action<? super Task> action); Task doLast(Closure action); // Closure Action for Task leftShift(doLast) instead of Task leftShift(Closure Action); // Delete all Action Task deleteAllActions();Copy the code

The function of leftShift is the same as doLast, adding an action to the end of the action list, but it is now obsolete. The official recommendation is to use doLast instead. Here’s a quick example:

build.gradle

Task hello {// Add an Action leftShift {println "+++++"}}Copy the code

LeftShift can also be succinct by using << instead, as shown below:

build.gradle

Task hello <<{// add an Action println "+++++" to the end of the Action list}Copy the code

When is an Action executed in a task?

Build a project instance: include ‘:app’, ‘:lib1’, ‘:lib2’.

Execute dependent tasks based on the task name passed by the gradle command. The Task Action is executed in this phase.

Two Task dependencies

Task task1 << {println "I am task1----"} task task2 << {println" I am task2----"} //task2 run task1 task2.mustRunAfter task1Copy the code

• Run task1: gradlew task1

  I am a task1 – –

• Run task2: gradlew task2

  I am a task2 – –

• Run task1 and task2 simultaneously: gradlew task1 task2

  I’m Task1 — — I’m Task2 —

The three tasks depend on each other

build.gradle

Task task1 << {println "I am task1----"} task task2 << {println" I am task2----"} task task3 << {println "I am task3----"} task2.mustRunAfter task1 task3.mustRunAfter task1Copy the code

• Run gradlew task1 task2 task3

  I’m Task1 — I’m Task2 — I’m Task3 —

• Run gradlew task1 task3 task2

  I’m Task1 — I’m Task3 — I’m Task1 —

In the case of syntactic inconsistencies, the dependencies form a closed loop and the compiler reports an error

task1.mustRunAfter task2
task2.mustRunAfter task1Copy the code

Gradle provides many tasks to use by default, such as copy and delete

• Copy images: single data source

task copyImage(type: Copy) {
    from 'C:\\Users\\yiba_zyj\\Desktop\\gradle\\copy'
    into 'C:\\Users\\yiba_zyj\\Desktop'
}Copy the code

• Copy images: Multiple data sources

task copyImage(type: Copy) {
    from 'C:\\Users\\yiba_zyj\\Desktop\\gradle\\copy' , 
         'C:\\Users\\yiba_zyj\\Desktop\\gradle\\copy'

    into 'C:\\Users\\yiba_zyj\\Desktop'
}Copy the code

• Copy pictures: Filter files

Only files with the suffix.jpg will be copied

task copyImage(type: Copy) {
    from 'C:\\Users\\yiba_zyj\\Desktop\\gradle\\copy'
    into 'C:\\Users\\yiba_zyj\\Desktop'
    include "*.jpg" 
}Copy the code

• Copy files: Filter and rename files

task copyImage(type: Copy) {
    from 'C:\\Users\\yiba_zyj\\Desktop\\gradle\\copy'
    into 'C:\\Users\\yiba_zyj\\Desktop'
    include "*.jpg"
    exclude "image1.jpg"
    rename("image2.jpg","123.jpg")
}Copy the code

File overwriting rules

Same file overwrite

Inheritance diagram of the Copy class

Copy (class) - AbstractCopyTask (Abstract class) (from, into, include, rename) -ConventionTask(Abstract class) - DefaultTask (class) - AbstractTask (Class) - TaskInternal - Task -Comparable<Task>, ExtensionAware -Project(delete)Copy the code

View all default built-in tasks of a project, excluding custom tasks

gradlew tasks

View all tasks (default task + custom Task)

Gradlew tasks – all

View information about a task, including the path, type, and description of the task

Gradlew help – a task taskName

View gradle version

gradlew -version

Gradlew is used to run tasks. Gradlew is used to run tasks. Running Gradle on a terminal will prompt you that Gradle is not an internal or external command, nor is it a runnable program or batch file.

'Gradle' is not an internal or external command, nor is it a runnable program or batch file.Copy the code

The official website to download: services.gradle.org/distributio…

After downloading, I decompressed the package and put it in the soft directory of DISK D. The environment variable

• GRADLE_HOME

D: \ soft \ gradle – 4.3 – all

• Path
  
  

D: \ soft \ gradle – 4.3 – all \ gradle – 4.3 \ bin