build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.
/*定义整个 project 的编译脚本和变量*/
buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.9.+'
    }
}

ext.compileSdkVersion=18
ext.buildToolsVersion="18.0.0"
ext.minSdkVersion=7
ext.targetSdkVersion=18