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公開したくない情報をlocal.propertiesに定義しbuild.gradleに読み込む

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GitHubでコードを公開する場合にAPI KEY等は一緒に公開したくありません。
一般的に local.properties.gitignore に指定するため、ここに書いて読み込めば大丈夫だろうということで local.properties に定義した値を読み込む方法を記載します。

local.properties
sdk.dir=/Users/hoge/Documents/Library/android-sdk
api_key= ...
build.gradle
android {
    defaultConfig {
      def properties = new Properties()
      properties.load(project.rootProject.file('local.properties').newDataInputStream())
      // local.propertiesのapi_keyに定義されている値を読み込む
      def API_KEY = properties.getProperty("api_key")
      // ついでにbuildConfigFieldに定義
      buildConfigField("String", "API_KEY", "\"${API_KEY}\"")
    }
}

参考

[How do i read properties defined in local.properties in build.gradle] (http://stackoverflow.com/questions/21999829/how-do-i-read-properties-defined-in-local-properties-in-build-gradle)

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