我正在尝试运行Animation3DTest，一个libgdx的测试示例
在桌面上（lwjgl）我可以完美地运行这个测试，我可以看到一个人和一把剑，我可以移动他，没有任何错误。
然而，在Android上，在开始这个测试之后，我得到了一个强制停止，这就是Logcat上显示的内容
09-24 10:46:49.526 24530-24577/com.badlogic.gdx.tests.android E/AndroidRuntime﹕ FATAL EXCEPTION: GLThread 1445
com.badlogic.gdx.utils.GdxRuntimeException: File not found: com/badlogic/gdx/graphics/g3d/shaders/default.vertex.glsl (Classpath)
at com.badlogic.gdx.files.FileHandle.read(FileHandle.java:133)
at com.badlogic.gdx.backends.android.AndroidFileHandle.read(AndroidFileHandle.java:77)
at com.badlogic.gdx.files.FileHandle.length(FileHandle.java:563)
at com.badlogic.gdx.backends.android.AndroidFileHandle.length(AndroidFileHandle.java:162)
at com.badlogic.gdx.files.FileHandle.readString(FileHandle.java:192)
at com.badlogic.gdx.files.FileHandle.readString(FileHandle.java:186)
at com.badlogic.gdx.graphics.g3d.shaders.DefaultShader.getDefaultVertexShader(DefaultShader.java:249)
at com.badlogic.gdx.graphics.g3d.utils.DefaultShaderProvider.<init>(DefaultShaderProvider.java:44)
at com.badlogic.gdx.graphics.g3d.ModelBatch.<init>(ModelBatch.java:101)
at com.badlogic.gdx.tests.g3d.BaseG3dTest.create(BaseG3dTest.java:38)
at com.badlogic.gdx.tests.g3d.BaseG3dHudTest.create(BaseG3dHudTest.java:50)
at com.badlogic.gdx.tests.g3d.Animation3DTest.create(Animation3DTest.java:45)
at com.badlogic.gdx.backends.android.AndroidGraphics.onSurfaceChanged(AndroidGraphics.java:322)
at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1514)
at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1242)