SerializationException Error reading JSON file in Android Studio for LibGDX uiskin

Question

我正在尝试使用 Android Studio 2.3.3 在 LibGDX 中加载一个 uiskin.json 文件以用于我的应用程序皮肤。但是，当我尝试加载皮肤时出现以下错误：

Exception in thread "LWJGL Application" com.badlogic.gdx.utils.SerializationException: Error reading file: UI/uiskin.json
at com.badlogic.gdx.scenes.scene2d.ui.Skin.load(Skin.java:98)
at com.mathsvszombies2.game.Screens.HomeScreen.show(HomeScreen.java:66)
at com.badlogic.gdx.Game.setScreen(Game.java:61)
at com.mathsvszombies2.game.Screens.StartScreen.render(StartScreen.java:58)
at com.badlogic.gdx.Game.render(Game.java:46)
at com.mathsvszombies2.game.MathsVsZombies.render(MathsVsZombies.java:42)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:225)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.run(LwjglApplication.java:126) 
Caused by: com.badlogic.gdx.utils.SerializationException: Error reading file: UI/uiskin.json
at com.badlogic.gdx.utils.Json.fromJson(Json.java:702)
at com.badlogic.gdx.scenes.scene2d.ui.Skin.load(Skin.java:96)
... 7 more
Caused by: com.badlogic.gdx.utils.SerializationException: Error parsing file: UI/uiskin.json
at com.badlogic.gdx.utils.JsonReader.parse(JsonReader.java:77)
at com.badlogic.gdx.utils.Json.fromJson(Json.java:700)
... 8 more
Caused by: com.badlogic.gdx.utils.SerializationException: Error parsing JSON on line 2 near: {
  *ERROR*com.badlogic.gdx.graphics.Color: {
  white: { a: 1, b: 1, g: 1,
at com.badlogic.gdx.utils.JsonReader.parse(JsonReader.java:549)
at com.badlogic.gdx.utils.JsonReader.parse(JsonReader.java:55)
at com.badlogic.gdx.utils.JsonReader.parse(JsonReader.java:75)
... 9 more

我的uiskin.json文件如下：

{
  com.badlogic.gdx.graphics.Color: {
  white: { a: 1, b: 1, g: 1, r: 1 },
  red: { a: 1, b: 0, g: 0, r: 1 },
  black: { a: 1, b: 0, g: 0, r: 0 }
},
  com.badlogic.gdx.scenes.scene2d.ui.Label$LabelStyle: {
  default: { font: default-font }
},
  com.badlogic.gdx.scenes.scene2d.ui.TextButton$TextButtonStyle: {
  default: { down: default-round-down, up: default-round, font: default-
font, fontColor: white },
  toggle: { down: default-round-down, up: default-round, checked: default-
round-down, font: default-font, fontColor: white, downFontColor: red }
},
  com.badlogic.gdx.scenes.scene2d.ui.ProgressBar$ProgressBarStyle: {
  default-horizontal: { background: default-slider, knob: default-slider-
knob },
  default-vertical: { background: default-slider, knob: default-round-large 
}
}
}

这是我用来加载 uiskin.json 文件的代码：

this.skin = new Skin();
this.skin.addRegions(MathsVsZombies.manager.get("UI/uiskin.atlas", TextureAtlas.class));
this.skin.add("default-font", MathsVsZombies.font24);
this.skin.load(Gdx.files.internal("UI/uiskin.json"));

编辑：这是我使用的新格式化的JSON文件

{
  "com.badlogic.gdx.graphics.Color":{
    "white":{
      "a":1,
      "b":1,
      "g":1,
      "r":1
    },
    "red":{
      "a":1,
      "b":0,
      "g":0,
      "r":1
    },
    "black":{
      "a":1,
      "b":0,
      "g":0,
      "r":0
    }
  },
  "com.badlogic.gdx.scenes.scene2d.ui.Label$LabelStyle":{
    "default":{
      "font":"default-font"
    }
  },
  "com.badlogic.gdx.scenes.scene2d.ui.TextButton$TextButtonStyle":{
    "default":{
      "down":"default-round-down",
      "up":"default-round",
      "font":"default-font",
      "fontColor":"white"
    },
    "toggle":{
      "down":"default-round-down",
      "up":"default-round",
      "checked":"default-round-down",
      "font":"default-font",
      "fontColor":"white",
      "downFontColor":"red"
    }
  },
  "com.badlogic.gdx.scenes.scene2d.ui.ProgressBar$ProgressBarStyle":{
    "default-horizontal":{
      "background":"default-slider",
      "knob":"default-slider-knob"
    },
    "default-vertical":{
      "background":"default-slider",
      "knob":"default-round-large"
    }
  }
}

这是我在运行应用新的 JSON 文件时得到的完整回溯

Exception in thread "LWJGL Application" com.badlogic.gdx.utils.SerializationException: Error reading file: UI/uiskin.json
at com.badlogic.gdx.scenes.scene2d.ui.Skin.load(Skin.java:98)
at com.mathsvszombies2.game.Screens.HomeScreen.show(HomeScreen.java:66)
at com.badlogic.gdx.Game.setScreen(Game.java:61)
at com.mathsvszombies2.game.Screens.StartScreen.render(StartScreen.java:58)
at com.badlogic.gdx.Game.render(Game.java:46)
at com.mathsvszombies2.game.MathsVsZombies.render(MathsVsZombies.java:42)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:225)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.run(LwjglApplication.java:126)
Caused by: com.badlogic.gdx.utils.SerializationException: Error reading file: UI/uiskin.json
    at com.badlogic.gdx.utils.Json.fromJson(Json.java:702)
    at com.badlogic.gdx.scenes.scene2d.ui.Skin.load(Skin.java:96)
    ... 7 more
Caused by: com.badlogic.gdx.utils.SerializationException: Error parsing file: UI/uiskin.json
    at com.badlogic.gdx.utils.JsonReader.parse(JsonReader.java:77)
    at com.badlogic.gdx.utils.Json.fromJson(Json.java:700)
    ... 8 more
Caused by: com.badlogic.gdx.utils.SerializationException: Error parsing JSON 
on line 2 near: {
  *ERROR*"com.badlogic.gdx.graphics.Color":{
    "white":{
      "a":1,
    at com.badlogic.gdx.utils.JsonReader.parse(JsonReader.java:549)
    at com.badlogic.gdx.utils.JsonReader.parse(JsonReader.java:55)
    at com.badlogic.gdx.utils.JsonReader.parse(JsonReader.java:75)
    ... 9 more

请帮忙。谢谢

Answer 1

SerializationException是输入无效造成的。您可以阅读有关此异常的所有信息 right here。在这种情况下，异常告诉您 uiskin.json 文件中存在错误。

如何解决这个问题:

运行您的 uiskin.json 代码通过 JSON 验证器，例如 this one.
阅读验证器给你的错误消息并相应地重写你的JSON。

我为您完成了上述步骤，发现错误是由几个无效的换行符引起的。它还给出了错误，指出 none 的字符串用引号引起来，但我认为这不再是主要问题。

在编辑 json 文件以消除所有错误后，验证器给了我所有的清晰信息并很好地格式化了它。

所以，这是格式正确且有效的 json 文件。

uiskin.json:

{
   "com.badlogic.gdx.graphics.Color":{
      "white":{
         "a":1,
         "b":1,
         "g":1,
         "r":1
      },
      "red":{
         "a":1,
         "b":0,
         "g":0,
         "r":1
      },
      "black":{
         "a":1,
         "b":0,
         "g":0,
         "r":0
      }
   },
   "com.badlogic.gdx.scenes.scene2d.ui.Label$LabelStyle":{
      "default":{
         "font":"default-font"
      }
   },
   "com.badlogic.gdx.scenes.scene2d.ui.TextButton$TextButtonStyle":{
      "default":{
         "down":"default-round-down",
         "up":"default-round",
         "font":"default-font",
         "fontColor":"white"
      },
      "toggle":{
         "down":"default-round-down",
         "up":"default-round",
         "checked":"default-round-down",
         "font":"default-font",
         "fontColor":"white",
         "downFontColor":"red"
      }
   },
   "com.badlogic.gdx.scenes.scene2d.ui.ProgressBar$ProgressBarStyle":{
      "default-horizontal":{
         "background":"default-slider",
         "knob":"default-slider-knob"
      },
      "default-vertical":{
         "background":"default-slider",
         "knob":"default-round-large"
      }
   }
}

我没有测试过这段代码，但是，我相信这个解决方案应该可以解决这个异常。

希望我的回答对您有所帮助，如果您有任何其他问题，请随时在下面发表评论！

Answer 2

原来 JSON 文件没问题，只是 Android 工作室在玩游戏。我重新启动它，它现在运行良好。

SerializationException Error reading JSON file in Android Studio for LibGDX uiskin

SerializationException Error reading JSON file in Android Studio for LibGDX uiskin

java

android

json

libgdx

android-studio