LibGdx [致命异常] 加载皮肤 .json 文件

【问题标题】：LibGdx [FATAL EXCEPTION] Loading a skin .json fileLibGdx [致命异常] 加载皮肤 .json 文件
【发布时间】：2016-05-23 19:42:28
【问题描述】：

我正在使用 Intellij。一切正常，APK 已部署在我的 Android 中，但它只是保持黑屏并返回家中说“'游戏'停止了：

    1023-1051/? E/AndroidRuntime﹕ FATAL EXCEPTION: GLThread 1591
Process: net.mygdx.game.android, PID: 1023
com.badlogic.gdx.utils.ax: Error reading file: jsonSkin.json
        at com.badlogic.gdx.e.a.a.i.a(Unknown Source)
        at com.badlogic.gdx.e.a.a.i.<init>(Unknown Source)
        at net.mygdx.game.a.a(Unknown Source)
        at com.badlogic.gdx.backends.android.i.onSurfaceChanged(Unknown Source)
        at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1520)
        at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1248)
 Caused by: com.badlogic.gdx.utils.ax: Error reading file: skins/jsonSkin.json
        at com.badlogic.gdx.utils.k.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.i.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.i.<init>(Unknown Source)
            at org.mygdx.gam.a.a(Unknown Source)
            at com.badlogic.gdx.backends.android.i.onSurfaceChanged(Unknown Source)
            at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1520)
            at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1248)
 Caused by: com.badlogic.gdx.utils.ax:
        at com.badlogic.gdx.e.a.a.k.a(Unknown Source)
        at com.badlogic.gdx.e.a.a.k.b(Unknown Source)
        at com.badlogic.gdx.utils.k.a(Unknown Source)
        at com.badlogic.gdx.e.a.a.j.a(Unknown Source)
            at com.badlogic.gdx.utils.k.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.i.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.i.<init>(Unknown Source)
            at net.mygdx.game.a.a(Unknown Source)
            at com.badlogic.gdx.backends.android.i.onSurfaceChanged(Unknown Source)
            at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1520)
            at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1248)
 Caused by: com.badlogic.gdx.utils.b.e: Class not found: com.badlogic.gdx.graphics.g2d.BitmapFont
        at com.badlogic.gdx.utils.b.b.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.k.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.k.b(Unknown Source)
            at com.badlogic.gdx.utils.k.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.j.a(Unknown Source)
            at com.badlogic.gdx.utils.k.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.i.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.i.<init>(Unknown Source)
            at net.mygdx.game.a.a(Unknown Source)
            at com.badlogic.gdx.backends.android.i.onSurfaceChanged(Unknown Source)
            at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1520)
            at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1248)
 Caused by: java.lang.ClassNotFoundException: com.badlogic.gdx.graphics.g2d.BitmapFont
        at java.lang.Class.classForName(Native Method)
        at java.lang.Class.forName(Class.java:251)
        at java.lang.Class.forName(Class.java:216)
            at com.badlogic.gdx.utils.b.b.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.k.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.k.b(Unknown Source)
            at com.badlogic.gdx.utils.k.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.j.a(Unknown Source)
            at com.badlogic.gdx.utils.k.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.i.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.i.<init>(Unknown Source)
            at net.mygdx.game.a.a(Unknown Source)
            at com.badlogic.gdx.backends.android.i.onSurfaceChanged(Unknown Source)
            at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1520)
            at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1248)
 Caused by: java.lang.NoClassDefFoundError: com/badlogic/gdx/graphics/g2d/BitmapFont
            at java.lang.Class.classForName(Native Method)
            at java.lang.Class.forName(Class.java:251)
            at java.lang.Class.forName(Class.java:216)
            at com.badlogic.gdx.utils.b.b.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.k.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.k.b(Unknown Source)
            at com.badlogic.gdx.utils.k.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.j.a(Unknown Source)
            at com.badlogic.gdx.utils.k.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.i.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.i.<init>(Unknown Source)
            at org.mygdx.gam.a.a(Unknown Source)
            at com.badlogic.gdx.backends.android.i.onSurfaceChanged(Unknown Source)
            at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1520)
            at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1248)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "com.badlogic.gdx.graphics.g2d.BitmapFont" on path: DexPathList[[zip file "/data/app/org.mygdx.gam.android-1.apk"],nativeLibraryDirectories=[/data/app-lib/org.mygdx.gam.android-1, /vendor/lib, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
            at java.lang.Class.classForName(Native Method)
            at java.lang.Class.forName(Class.java:251)
            at java.lang.Class.forName(Class.java:216)
            at com.badlogic.gdx.utils.b.b.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.k.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.k.b(Unknown Source)
            at com.badlogic.gdx.utils.k.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.j.a(Unknown Source)
            at com.badlogic.gdx.utils.k.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.i.a(Unknown Source)
            at com.badlogic.gdx.e.a.a.i.<init>(Unknown Source)
            at org.mygdx.gam.a.a(Unknown Source)
            at com.badlogic.gdx.backends.android.i.onSurfaceChanged(Unknown Source)
            at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1520)
            at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1248)

这是我的 .json 文件；

{
com.badlogic.gdx.graphics.g2d.BitmapFont: { default-font: { file: default.fnt } },
com.badlogic.gdx.graphics.Color: {
    green: { a: 1, b: 0, g: 1, r: 0 },
    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.Skin$TintedDrawable: {
    dialogDim: { name: white, color: { r: 0, g: 0, b: 0, a: 0.45 } },
},
com.badlogic.gdx.scenes.scene2d.ui.Button$ButtonStyle: {
    default: { down: default-round-down, up: default-round },
    toggle: { down: default-round-down, checked: default-round-down, up: default-round }
},
com.badlogic.gdx.scenes.scene2d.ui.TextButton$TextButtonStyle: {
    default: { down: default-round-down, up: default-round, font: default-font, fontColor: white },
    toggle: { down: default-round-down, up: default-round, checked: default-round-down, font: default-font, fontColor: white, downFontColor: red }
},
com.badlogic.gdx.scenes.scene2d.ui.ScrollPane$ScrollPaneStyle: {
    default: { vScroll: default-scroll, hScrollKnob: default-round-large, background: default-rect, hScroll: default-scroll, vScrollKnob: default-round-large }
},
com.badlogic.gdx.scenes.scene2d.ui.SelectBox$SelectBoxStyle: {
    default: {
        font: default-font, fontColor: white, background: default-select,
        scrollStyle: default,
        listStyle: { font: default-font, selection: default-select-selection }
    }
},
com.badlogic.gdx.scenes.scene2d.ui.SplitPane$SplitPaneStyle: {
    default-vertical: { handle: default-splitpane-vertical },
    default-horizontal: { handle: default-splitpane }
},
com.badlogic.gdx.scenes.scene2d.ui.Window$WindowStyle: {
    default: { titleFont: default-font, background: default-window, titleFontColor: white },
    dialog: { titleFont: default-font, background: default-window, titleFontColor: white, stageBackground: dialogDim }
},
com.badlogic.gdx.scenes.scene2d.ui.ProgressBar$ProgressBarStyle: {
    default-horizontal: { background: default-slider, knob: default-slider-knob },
    default-vertical: { background: default-slider, knob: default-round-large }
},
com.badlogic.gdx.scenes.scene2d.ui.Slider$SliderStyle: {
    default-horizontal: { background: default-slider, knob: default-slider-knob },
    default-vertical: { background: default-slider, knob: default-round-large }
},
com.badlogic.gdx.scenes.scene2d.ui.Label$LabelStyle: {
    default: { font: default-font, fontColor: white }
},
com.badlogic.gdx.scenes.scene2d.ui.TextField$TextFieldStyle: {
    default: { selection: selection, background: textfield, font: default-font, fontColor: white, cursor: cursor }
},
com.badlogic.gdx.scenes.scene2d.ui.CheckBox$CheckBoxStyle: {
    default: { checkboxOn: check-on, checkboxOff: check-off, font: default-font, fontColor: white }
},
com.badlogic.gdx.scenes.scene2d.ui.List$ListStyle: {
    default: { fontColorUnselected: white, selection: selection, fontColorSelected: white, font: default-font }
},
com.badlogic.gdx.scenes.scene2d.ui.Touchpad$TouchpadStyle: {
    default: { background: default-pane, knob: default-round-large }
},
com.badlogic.gdx.scenes.scene2d.ui.Tree$TreeStyle: {
    default: { minus: tree-minus, plus: tree-plus, selection: default-select-selection }
},
com.badlogic.gdx.scenes.scene2d.ui.TextTooltip$TextTooltipStyle: {
    default: {
        label: { font: default-font, fontColor: white },
        background: default-pane, wrapWidth: 150
    }
},
}

这些行很奇怪，因为如果我去掉它们，程序就可以正常工作，除了显然没有出现的按钮；

skin = new Skin(Gdx.files.internal("jsonSkin.json"));
TextButton btnStart = new TextButton("Start!!", skin);
btnStart.setPosition(50f,400f);
btnStart.setSize(260f,60f);
mainMenu.addActor(btnStart);

【问题讨论】：

  • 看起来您的 Proguard 配置不排除 libgdx 类。由于 Skin 通过反射加载类，因此您不能允许 Proguard 更改这些类的名称。
  • 你确定这存在吗？ skins/jsonSkin.json
  • 请_-Tenfour-_ 你能告诉我更多关于我如何不允许proguard 更改名称的信息吗？ ——
  • 我禁用了 Proguard，但仍有错误，请有人帮忙????

标签： java android json intellij-idea libgdx


【解决方案1】：

把它放在你的配置中：

 -keep class com.badlogic.**{
   **[] $VALUES;
    *;
}

它将解决此问题以及反射问题。

编辑：

以上是禁用特定包上所有 ProGuard’s goodness 的顶级规则。不缩水，不混淆；不适用于课程，不适用于会员。

Proguard 混淆了我们在皮肤文件中使用的类，Skin 通过反射加载类，因此我们必须不允许 Proguard 更改这些类的名称。

  1. 包中的双星号表示该顶级包下的每个包下的每个类；
  2. 大括号内的星号适用于这些类中的每个成员（变量、方法和常量）。

【讨论】：

  • 那么这条线到底在做什么呢？我对 proguard 很陌生，这对于几乎所有东西来说都是一个巨大的通配符。在这种情况下，Proguard 仅对混淆有用，而对缩小和减小文件大小没有多大用处。我+1，但如果你能详细说明一下就好了。
  • @Madmenyo 我添加了更多细节，上面的规则禁用了 libgdx 包上的 proguard，但你自己的类仍然被 proguard 安全（混淆）。如果您更关心混淆，可以更深入地禁用 com.badlogic.gdx.scenes.scene2d.ui 上的混淆，并添加一些外部类，例如 BitmapFont 或 Color，这些类可能是您在皮肤文件中的。
【解决方案2】：

问题是 json 序列化程序需要准确的字段名称才能完成工作。

Abhishek 是正确的，但我只需要忽略 Scene2d 包的收缩，所以我把它放在 proguard-rules.pro 文件中

 -keep class com.badlogic.gdx.scenes.scene2d.ui.**{
    **[] $VALUES;
     *;
 }

它将优化除皮肤加载器及其组件之外的所有其他代码。

如果您使用自己的类进行 json 反序列化/序列化，您还需要添加类似的内容。

 -keep class com.your.game.data.**{
    **[] $VALUES;
     *;
 }

这是在 Android Studio 上为初学者找到 proguard-rules.pro 文件的屏幕截图

【讨论】：

    【解决方案3】：

    把它放在你的 proguard 规则中

    -保留类com.badlogic.gdx.graphics.g2d.BitmapFont

    【讨论】：

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