Could not get unknown property 'ANDROID_BUILD_SDK_VERSION'

Error:(7, 0) Could not get unknown property ‘ANDROID_BUILD_SDK_VERSION’ for project ‘:InitActivity’

build.gradle如下

apply plugin: 'com.android.library'dependencies {}android {    compileSdkVersion Integer.parseInt(project.ANDROID_BUILD_SDK_VERSION)    buildToolsVersion project.ANDROID_BUILD_TOOLS_VERSION    defaultConfig {        minSdkVersion Integer.parseInt(project.ANDROID_BUILD_MIN_SDK_VERSION)        targetSdkVersion Integer.parseInt(project.ANDROID_BUILD_TARGET_SDK_VERSION)    }    sourceSets {        main {            manifest.srcFile 'AndroidManifest.xml'            java.srcDirs = ['src']            jniLibs.srcDirs = ['libs']            aidl.srcDirs = ['src']            renderscript.srcDirs = ['src']            res.srcDirs = ['res']        }    }}
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解决方法

方法1：在工程的根目录下，创建gradle.properties文件

ANDROID_BUILD_TARGET_SDK_VERSION=25ANDROID_BUILD_TOOLS_VERSION=25.0.0ANDROID_BUILD_SDK_VERSION=25ANDROID_BUILD_MIN_SDK_VERSION=14
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方法2：Android Studio

方法3

android {    compileSdkVersion Integer.parseInt(project.ANDROID_BUILD_SDK_VERSION)    buildToolsVersion project.ANDROID_BUILD_TOOLS_VERSION    defaultConfig {         minSdkVersion 8         targetSdkVersion Integer.parseInt(project.ANDROID_BUILD_TARGET_SDK_VERSION)    }
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android {    compileSdkVersion 19    buildToolsVersion '19.1.0'    defaultConfig {         minSdkVersion 15         targetSdkVersion 19    }