gradle.build里面创建编译时属性值

android {
compileSdkVersion 21
buildToolsVersion '21.1.2'

defaultConfig {
minSdkVersion 16
targetSdkVersion 16

Properties props = new Properties()
props.load(new FileInputStream("sampleapp/sampleapp.properties"))

buildConfigField "String", "key1", props.getProperty("value1")
buildConfigField "String", "key2", props.getProperty("value2")
}
}

根据以上配置，编译后自动生成BuildConfig.java