问题

So, I cloned this project from Github and while going through its build.gradle, I found this strange configuration, particularly for targetSdkVersion. Now, before I jump into the details of what it is, let me mention that the project has two modules - app(the main one) and callrecord(encapsualting the call recording functionality)

Here is the build.gradle file for the same:

apply plugin: 'com.android.application'

android {
    compileSdkVersion project.sdk

    defaultConfig {
        applicationId "com.aykuttasil.callrecorder"
        minSdkVersion project.minSdk
        targetSdkVersion project.sdk
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile "com.android.support:appcompat-v7:$supportVersion"
    testCompile 'junit:junit:4.12'
    compile project(':callrecord')
}

Can you see it?

I don't understand the line compileSdkVersion project.sdk. This project "object" has been referenced at several other places too.

First, why would someone use this property? Second, how do I find out what version it is?

回答1:

why would someone use this property?

The main purpose behind to use this property To Configure all variables for Android project modules in one place
so changing it in one place will effect in whole project

how do I find out what version it is?

it will be available in gradle.properties or build.gradle in file

have a look in Build.Gradle file of CallRecorder of that project

SAMPLE

Here is the good article on it Configure variables for all Android project modules in one place

gradle.properties

# Project-wide Gradle settings.
# IDE (e.g. Android Studio) users:
# Gradle settings configured through the IDE *will override*
# any settings specified in this file.
# For more details on how to configure your build environment visit
# http://www.gradle.org/docs/current/userguide/build_environment.html
# Specifies the JVM arguments used for the daemon process.
# The setting is particularly useful for tweaking memory settings.
org.gradle.jvmargs=-Xmx1536m
android.useAndroidX = true
android.enableJetifier = false

#gradle.properties
myTargetSdkVersion=27
myCompileSdkVersion=27
# When configured, Gradle will run in incubating parallel mode.
# This option should only be used with decoupled projects. More details, visit
# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
# org.gradle.parallel=true

than use in your Build.Gradle

android {
    compileSdkVersion project.myTargetSdkVersion.toInteger()
    defaultConfig {
        applicationId "com.example.nilesh.myapplication"
        minSdkVersion project.myMinSdkVersion.toInteger()
        targetSdkVersion project.myTargetSdkVersion.toInteger()
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        targetCompatibility 1.8
        sourceCompatibility 1.8
    }
}

来源：https://stackoverflow.com/questions/52108359/targetsdkversion-gradle-strange-value

标签

android