Android: automatically choose debug/release Maps v2 api key?

Using build.gradle

buildTypes {

    debug {
        buildConfigField("String", "map_api_key", "\"your debug map api key here\"")
    }
    release {
        buildConfigField("String", "map_api_key", "\"your release map api key here\"")
    }
}

I solved this issue using this steps:

In Google Developer API Console

1. Click on Create New Android key...
2. In cmd.exe/Terminal: keytool -list -v -keystore mystore.keystore
3. Password: android
4. Now enter SHA1 key;package name for debug and press enter
5. Enter SHA1 key;package name for release
6. Click on Create

Now use this API key your project

<meta-data
    android:name="com.google.android.maps.v2.API_KEY"
    android:value="@string/common_map_api_key"/>