gradle-retrolambda

配置

classpath 'me.tatarka:gradle-retrolambda:3.2.0'

apply plugin: 'me.tatarka.retrolambda'
android {
  compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
  }
}

//Proguard
-dontwarn java.lang.invoke.*