Unified specification method for Android development version

There are many different versions of Android development, such as compileSdkVersion, , minSdkVersion, targetSdkVersionand the versions that rely on third-party libraries in the project. Different modules and different developers have different versions, so a unified version specification file is needed. Now I will introduce it. a method.

In the root directory of the project, that is, the build.gradle file (build.gradle of the project) in the same directory as the app, as shown in the figure below

Add the following groovy code at the end. 

ext {
    // Sdk and tools
    compile_sdk_version = 26
    build_tools_version = '26.0.0'
    min_sdk_version = 14
    target_sdk_version = 22

    version_code = 100900900
    version_name = '1.9.9'

    // App dependencies
    support_version = '26.1.0'

    leakcanary_version = '1.5.4'

    junit_version = '4.12'
    robolectric_version = '3.1.2'
}

With this specification, our build.gradle file under the app can be referenced like this

android {
    compileSdkVersion compile_sdk_version
    defaultConfig {
        minSdkVersion min_sdk_version
        versionCode version_code
        versionName version_name
    }
}

dependencies {
    compileOnly "com.android.support:appcompat-v7:$support_version"
    compileOnly "com.android.support:design:$support_version"

    testImplementation "junit:junit:$junit_version"
    testImplementation "org.robolectric:robolectric:$robolectric_version"
    testImplementation "com.android.support:support-v4:$support_version"
}

Is it once and for all? To modify the version in the future, you only need to modify the build.gradle file in the root directory to modify all dependent versions. I hope it can help your Android development specifications.