build.gradle

android {
  defaultConfig {
    // other setting
    // minSdkVersion 15 // 這行要拿掉
    multiDexEnabled true // 設定啟動 multidex
  }
  
  productFlavors {
    dev {
        minSdkVersion 21 // only apply after android 5.0
    }
    
    prod {
        minSdkVersion 15
    }
  }
  
  buildTypes {
    /* remove debug mode proguard
    debug {
      minifyEnabled true
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
    */
    
    release {
      minifyEnabled true
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
  }
}