Ray`s Tech Lab

후..삽질하다가 너무 어이없게 해결해서 쓴다. 사실 내가 무지했던 거지만..

플러터에서 dio를 통해 스프링부트에서 간단하게 만든 api를 테스트하는 중이었다. 근데 어머나?

SocketException: Connection refused (OS Error: Connection refused, errno = 111)

라는 오류가 떴다. 

포스트맨으로 할 때도 됐고,,웹에서 할 때도 됐는데,,왜 안 될까.. CORS문제인가하면서 이상한 뻘짓들을 했는데

답은 너무나도 간단했다.

안드로이드 에뮬레이터는 localhost를 사용할 수 없는 거였다

하..너무 당연하게 웹에서 구동하는 줄 알았따 ㅜㅠ 이거 땜에 뭔 고생을 한건지..

암튼, localhost대신 10.0.2.2를 쓰면 된다고 한다. 물론 프로덕션으로 가게 되면 다른 걸 설정해야됨!

https://developer.android.com/studio/run/emulator-networking?hl=ko 

스플래시 스크린이란?

애플리케이션 실행 시 화면 컨텐츠가 로딩되기까지 일시적으로 보여주는 화면을 말한다.

그럼 이걸 플러터에선 어떻게 만들 수 있는가?

찾아보니까 다른 방법들도 있었지만, 가장 쉬운 방법은 flutter_native_splash라는 패키지를 이용하는 것이었다.

매우 쉽다. 아래 링크에 나온 방법대로 패키지를 설치하고 사용하면 된다. 

https://pub.dev/packages/flutter_native_splash

패키지 설치 후,  flutter_native_splash.yaml을 만들어주고 다음 내용을 복붙해준다. 위 웹페이지에 있는 내용과 동일하다.

flutter_native_splash:
  # This package generates native code to customize Flutter's default white native splash screen
  # with background color and splash image.
  # Customize the parameters below, and run the following command in the terminal:
  # dart run flutter_native_splash:create
  # To restore Flutter's default white splash screen, run the following command in the terminal:
  # dart run flutter_native_splash:remove

  # color or background_image is the only required parameter.  Use color to set the background
  # of your splash screen to a solid color.  Use background_image to set the background of your
  # splash screen to a png image.  This is useful for gradients. The image will be stretch to the
  # size of the app. Only one parameter can be used, color and background_image cannot both be set.
  color: "#42a5f5"
  #background_image: "assets/background.png"

  # Optional parameters are listed below.  To enable a parameter, uncomment the line by removing
  # the leading # character.

  # The image parameter allows you to specify an image used in the splash screen.  It must be a
  # png file and should be sized for 4x pixel density.
  #image: assets/splash.png

  # The branding property allows you to specify an image used as branding in the splash screen.
  # It must be a png file. It is supported for Android, iOS and the Web.  For Android 12,
  # see the Android 12 section below.
  #branding: assets/dart.png

  # To position the branding image at the bottom of the screen you can use bottom, bottomRight,
  # and bottomLeft. The default values is bottom if not specified or specified something else.
  #branding_mode: bottom

  # The color_dark, background_image_dark, image_dark, branding_dark are parameters that set the background
  # and image when the device is in dark mode. If they are not specified, the app will use the
  # parameters from above. If the image_dark parameter is specified, color_dark or
  # background_image_dark must be specified.  color_dark and background_image_dark cannot both be
  # set.
  #color_dark: "#042a49"
  #background_image_dark: "assets/dark-background.png"
  #image_dark: assets/splash-invert.png
  #branding_dark: assets/dart_dark.png

  # Android 12 handles the splash screen differently than previous versions.  Please visit
  # https://developer.android.com/guide/topics/ui/splash-screen
  # Following are Android 12 specific parameter.
  android_12:
    # The image parameter sets the splash screen icon image.  If this parameter is not specified,
    # the app's launcher icon will be used instead.
    # Please note that the splash screen will be clipped to a circle on the center of the screen.
    # App icon with an icon background: This should be 960×960 pixels, and fit within a circle
    # 640 pixels in diameter.
    # App icon without an icon background: This should be 1152×1152 pixels, and fit within a circle
    # 768 pixels in diameter.
    #image: assets/android12splash.png

    # Splash screen background color.
    #color: "#42a5f5"

    # App icon background color.
    #icon_background_color: "#111111"

    # The branding property allows you to specify an image used as branding in the splash screen.
    #branding: assets/dart.png

    # The image_dark, color_dark, icon_background_color_dark, and branding_dark set values that
    # apply when the device is in dark mode. If they are not specified, the app will use the
    # parameters from above.
    #image_dark: assets/android12splash-invert.png
    #color_dark: "#042a49"
    #icon_background_color_dark: "#eeeeee"

  # The android, ios and web parameters can be used to disable generating a splash screen on a given
  # platform.
  #android: false
  #ios: false
  #web: false

  # Platform specific images can be specified with the following parameters, which will override
  # the respective parameter.  You may specify all, selected, or none of these parameters:
  #color_android: "#42a5f5"
  #color_dark_android: "#042a49"
  #color_ios: "#42a5f5"
  #color_dark_ios: "#042a49"
  #color_web: "#42a5f5"
  #color_dark_web: "#042a49"
  #image_android: assets/splash-android.png
  #image_dark_android: assets/splash-invert-android.png
  #image_ios: assets/splash-ios.png
  #image_dark_ios: assets/splash-invert-ios.png
  #image_web: assets/splash-web.gif
  #image_dark_web: assets/splash-invert-web.gif
  #background_image_android: "assets/background-android.png"
  #background_image_dark_android: "assets/dark-background-android.png"
  #background_image_ios: "assets/background-ios.png"
  #background_image_dark_ios: "assets/dark-background-ios.png"
  #background_image_web: "assets/background-web.png"
  #background_image_dark_web: "assets/dark-background-web.png"
  #branding_android: assets/brand-android.png
  #branding_dark_android: assets/dart_dark-android.png
  #branding_ios: assets/brand-ios.gif
  #branding_dark_ios: assets/dart_dark-ios.gif

  # The position of the splash image can be set with android_gravity, ios_content_mode, and
  # web_image_mode parameters.  All default to center.
  #
  # android_gravity can be one of the following Android Gravity (see
  # https://developer.android.com/reference/android/view/Gravity): bottom, center,
  # center_horizontal, center_vertical, clip_horizontal, clip_vertical, end, fill, fill_horizontal,
  # fill_vertical, left, right, start, or top.
  #android_gravity: center
  #
  # ios_content_mode can be one of the following iOS UIView.ContentMode (see
  # https://developer.apple.com/documentation/uikit/uiview/contentmode): scaleToFill,
  # scaleAspectFit, scaleAspectFill, center, top, bottom, left, right, topLeft, topRight,
  # bottomLeft, or bottomRight.
  #ios_content_mode: center
  #
  # web_image_mode can be one of the following modes: center, contain, stretch, and cover.
  #web_image_mode: center

  # The screen orientation can be set in Android with the android_screen_orientation parameter.
  # Valid parameters can be found here:
  # https://developer.android.com/guide/topics/manifest/activity-element#screen
  #android_screen_orientation: sensorLandscape

  # To hide the notification bar, use the fullscreen parameter.  Has no effect in web since web
  # has no notification bar.  Defaults to false.
  # NOTE: Unlike Android, iOS will not automatically show the notification bar when the app loads.
  #       To show the notification bar, add the following code to your Flutter app:
  #       WidgetsFlutterBinding.ensureInitialized();
  #       SystemChrome.setEnabledSystemUIMode(SystemUiMode.manual, overlays: [SystemUiOverlay.bottom, SystemUiOverlay.top], );
  #fullscreen: true

  # If you have changed the name(s) of your info.plist file(s), you can specify the filename(s)
  # with the info_plist_files parameter.  Remove only the # characters in the three lines below,
  # do not remove any spaces:
  #info_plist_files:
  #  - 'ios/Runner/Info-Debug.plist'
  #  - 'ios/Runner/Info-Release.plist'

background image로 쓸 이미지가 있으면 주석 풀어서 경로 써주면 되고.. 뭐 그런 식이다

참고로 안드로이드 12 이상을 쓸 경우 android 12: 쪽에 있는 내용도 별도로 주석풀어서 작업해줘야 한다!! 이거 안 하면 안드로이드 쪽에선 에러난다.

또한 위 웹페이지에서 살펴볼 수 있듯, 안드로이드 12 이상을 쓰는 경우에는 권장하는 이미지 사이즈가 있다. 그거에 맞춰서 이미지 만들면 됨. 대략 가로 세로 1152px이어야 하고, 가운데에 지름이 768px인 원을 두고 그 안에 다 보여줄 수 있게끔 이미지를 만들어야 한다고 함.

그 뒤 터미널에 다음 커맨드를 입력하면 된다

dart run flutter_native_splash:create

그럼 알아서 배율에 맞게끔 이미지들이 생성되며(스플래시 스크린에서 보여줄 이미지들이 있는 경우) 스플래시 스크린이 만들어진다.

참고로, 수정이 필요한 경우 

flutter pub run flutter_native_splash:remove

요 커맨드 입력하고 내용 수정한 후, 다시 dart run ~ 이거 하면 된다.