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Question

在为libGDX安卓库完成this tutorial后，桌面项目运行正常，并且eclipse指出的任何地方都没有错误。当我在我的Nexus 7上运行它时（运行Android 4.3）白屏闪烁（可能是应用程序的默认背景）然后它会回到主屏幕并说'＃34;不幸的是我的第一个三角形-android已停止。＆＃34;

这是我从LogCat得到的错误：

08-02 20:11:52.940: E/AndroidRuntime(4095): FATAL EXCEPTION: main
08-02 20:11:52.940: E/AndroidRuntime(4095): java.lang.NoClassDefFoundError: com.test.myfirsttriangle.MyFirstTriangle
08-02 20:11:52.940: E/AndroidRuntime(4095):     at com.example.my_first_triangle_android.MainActivity.onCreate(MainActivity.java:12)
08-02 20:11:52.940: E/AndroidRuntime(4095):     at android.app.Activity.performCreate(Activity.java:5133)
08-02 20:11:52.940: E/AndroidRuntime(4095):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
08-02 20:11:52.940: E/AndroidRuntime(4095):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
08-02 20:11:52.940: E/AndroidRuntime(4095):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
08-02 20:11:52.940: E/AndroidRuntime(4095):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
08-02 20:11:52.940: E/AndroidRuntime(4095):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
08-02 20:11:52.940: E/AndroidRuntime(4095):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-02 20:11:52.940: E/AndroidRuntime(4095):     at android.os.Looper.loop(Looper.java:137)
08-02 20:11:52.940: E/AndroidRuntime(4095):     at android.app.ActivityThread.main(ActivityThread.java:5103)
08-02 20:11:52.940: E/AndroidRuntime(4095):     at java.lang.reflect.Method.invokeNative(Native Method)
08-02 20:11:52.940: E/AndroidRuntime(4095):     at java.lang.reflect.Method.invoke(Method.java:525)
08-02 20:11:52.940: E/AndroidRuntime(4095):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
08-02 20:11:52.940: E/AndroidRuntime(4095):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-02 20:11:52.940: E/AndroidRuntime(4095):     at dalvik.system.NativeStart.main(Native Method)

项目：我的第一个三角形

MyFirstTriangle.java：

package com.test.myfirsttriangle;

import com.badlogic.gdx.ApplicationListener;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.Mesh;
import com.badlogic.gdx.graphics.VertexAttribute;
import com.badlogic.gdx.graphics.VertexAttributes.Usage;

public class MyFirstTriangle implements ApplicationListener {
    private Mesh mesh;

    @Override
    public void create() {
        if (mesh == null) {
            mesh = new Mesh(true, 3, 3, 
                    new VertexAttribute(Usage.Position, 3, "a_position"));      

            mesh.setVertices(new float[] { -0.5f, -0.5f, 0,
                                           0.5f, -0.5f, 0,
                                           0, 0.5f, 0 });   
            mesh.setIndices(new short[] { 0, 1, 2 });           
        }
    }

    @Override
    public void dispose() { }

    @Override
    public void pause() { }

    @Override
    public void render() {
        mesh.render(GL10.GL_TRIANGLES, 0, 3);
    }

    @Override
    public void resize(int width, int height) { }

    @Override
    public void resume() { }
}

MyFirstTriangleDesktop.java

package com.test.myfirsttriangle;

import com.badlogic.gdx.backends.jogl.JoglApplication;

public class MyFirstTriangleDesktop {
    public static void main (String[] argv) {
        new JoglApplication(new MyFirstTriangle(), "My First Triangle", 480, 320, false);       
    }
}

项目：my-first-triangle-android

MainActivity.java：

package com.example.my_first_triangle_android;

import android.os.Bundle;

import com.badlogic.gdx.backends.android.AndroidApplication;
import com.test.myfirsttriangle.MyFirstTriangle;

public class MainActivity extends AndroidApplication {
    @Override
        public void onCreate (Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                initialize(new MyFirstTriangle(), false);               
        }
}

额外信息：我正在运行这个月食： http://developer.android.com/sdk/installing/bundle.html

修改

好像是来自log cat的错误

08-02 20:11:52.940: E/AndroidRuntime(4095): FATAL EXCEPTION: main
08-02 20:11:52.940: E/AndroidRuntime(4095): java.lang.NoClassDefFoundError: com.test.myfirsttriangle.MyFirstTriangle
08-02 20:11:52.940: E/AndroidRuntime(4095):     at com.example.my_first_triangle_android.MainActivity.onCreate(MainActivity.java:12)

此行存在问题：

initialize(new MyFirstTriangle(), false);

Answer 1

检查以确保您的构建路径正确无误。在最新版本的Android中，您需要明确导出您的私有库。

编辑：更有可能你需要去你的房产=＆gt; Java Build Path =＆gt;订单和导出（选项卡）然后选中Android私有库的框以确保所有libGDX类与您的项目链接。

Answer 2

从多个项目构建Android应用程序远比它应该更加繁琐。基本上，当ADT构建你的Android软件包时，忘记在构建中包含你的Libgdx“核心”软件包（my-first-triangle）。

在Package Explorer中右键单击您的Android项目，点击Properties，然后选择Java Build Path。问题最有可能发生在Order and Export标签上。确保您的my-first-triangle项目已标记为要导出（应设置复选标记）。

这不是Libgdx问题。只是Libgdx将应用程序分解为多个软件包，因此比常规Android用户更频繁地绊倒。

LibGDX'MyFirstTriangle'示例在启动时崩溃

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2 个答案: