如何在build.gradle中为版本指定通用字符串？

Question

I have a build.gradle that has following content:-

compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support:design:25.3.1'
compile 'com.android.support:cardview-v7:25.3.1'
compile 'com.android.support:recyclerview-v7:25.3.1'

How can I specify the version number (here 25.3.1) at a common place and reuse it every where, so that when ever I need to change it, I have to change it at only one place?

Answer 1

You can use Gradle features to achieve this.

ext {
    supportVersion = "25.3.1"
}

dependencies {
    compile "com.android.support:appcompat-v7:$supportVersion"
    compile "com.android.support:design:$supportVersion"
    compile "com.android.support:cardview-v7:$supportVersion"
    compile "com.android.support:recyclerview-v7:$supportVersion"
}

See also:

• https://docs.gradle.org/3.3/userguide/writing_build_scripts.html

Answer 2

In Project level gradle, you specify the version code. If we specify version code in project level then we can use that version in all modules. For example, we had three modules in a project. If we specify version code in project level then easily use that in module level gradle file.

ext {
    appcompatVersion = '25.3.1'
    supportDesignVersion = '25.3.1'
    cardviewVersion = '25.3.1'
    recyclerviewVersion = '25.3.1' 
}

In Module level gradle, you use it like below:

dependencies {
        compile 'com.android.support:appcompat-v7:$appcompatVersion'
        compile 'com.android.support:design:$supportDesignVersion'
        compile 'com.android.support:cardview-v7:$cardviewVersion'
        compile 'com.android.support:recyclerviewv7:$recyclerviewVersion'
}

Answer 3

In the project gradle file add the variable

  buildscript {
     ext.supportLibraryVersion = "25.3.1"

     dependencies {
          classpath 'com.android.tools.build:gradle:2.3.3'
          ........

And in the app gradle file refer the variable created.

  dependencies {
      compile "com.android.support:appcompat-v7:$supportLibraryVersion"
      compile "com.android.support:design:$supportLibraryVersion"

for more reference follow this link