[英]LibGDX 'MyFirstTriangle' example crashes on startup
完成libGDX android庫的本教程后 ,桌面項目運行正常,eclipse指出的任何地方都沒有錯誤。 當我在我的Nexus 7上運行它時(運行Android 4.3)白屏閃爍(可能是應用程序的默認背景)然后它回到主屏幕並說“不幸的是我的第一個三角形 - 機器人已經停止“。
這是我從LogCat得到的錯誤:
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)
項目:我的第一個三角形
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);
}
}
項目: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);
}
}
額外信息:我正在運行這個日食: http : //developer.android.com/sdk/installing/bundle.html
看起來像log cat中的錯誤
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)
這條線有問題:
initialize(new MyFirstTriangle(), false);
檢查以確保您的構建路徑正確。 在最新版本的Android中,您需要明確導出您的私有庫。
編輯:你很可能需要轉到你的屬性=> Java Build Path => Order and Export(tab)然后選中Android Private Libraries框以確保所有libGDX類都鏈接到你的項目。
從多個項目中構建Android應用程序遠比它應該更加繁瑣。 基本上,當ADT構建你的Android軟件包時,忘記在構建中包含你的Libgdx“核心”軟件包( my-first-triangle
)。
在Package Explorer中右鍵單擊您的Android Project,單擊Properties
,選擇Java Build Path
。 問題很可能出在“ Order and Export
選項卡上。 確保my-first-triangle
項目標記為導出(它應該有一個復選標記集)。
這不是Libgdx問題。 只是Libgdx將應用程序分解為多個軟件包,因此比常規的Android用戶更頻繁地絆倒它。
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