android - 使用 TexturePacker (AndEngine) 加载纹理

Question

我使用 TexturePacker。我打包了我的纹理，我有这个文件：

• sample.png
• sample.tps
• sample.xml
• sample.java

这些资源是assets/gfx/sample. 我连接到项目sample.java。
我有这个代码：

Textures.java

public class Textures {

private ITexture mSpritesheetTexture;
private TexturePackTextureRegionLibrary mSpritesheetTexturePackTextureRegionLibrary;
private TextureRegion faceTextureRegion;
private TexturePack spritesheetTexturePack;

public Textures(final BaseGameActivity activity, final Engine engine) {
    try {
        BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");
        this.spritesheetTexturePack = new TexturePackLoader(activity, "sample/").loadFromAsset(activity, "faces.xml");
        this.mSpritesheetTexture = spritesheetTexturePack.getTexture();
        this.mSpritesheetTexturePackTextureRegionLibrary = spritesheetTexturePack.getTexturePackTextureRegionLibrary();
        this.faceTextureRegion = this.mSpritesheetTexturePackTextureRegionLibrary.get(faces.FACES_ID);

        engine.getTextureManager().loadTexture(this.mSpritesheetTexture);
    } catch (final TexturePackParseException e) {
        Log.e("Error", String.valueOf(e));
    }
}

public TextureRegion getT(){
    return faceTextureRegion;
}

}

Main.java

...
Textures textures;
...
@Override
public void onLoadResources() {
    textures = new Textures(this, getEngine());
}

定义精灵，我在这一行得到一个错误：

final Sprite spriteS = new Sprite(50, 50, textures.getT());  

E/AndroidRuntime(391): Caused by: java.lang.NullPointerException
E/AndroidRuntime(391): at com.web.scene.AboutScene.<init>(AboutScene.java:24)

我的错误是什么？

Answer 1

我认为问题在于您尝试在执行Sprite spriteS之前初始化onLoadResources()。

这样的事情可能会帮助你：

Textures textures;
Sprite spriteS;
...
@Override
public void onLoadResources() {
    textures = new Textures(this, getEngine());
    spriteS = new Sprite(50, 50, textures.getT());  
}

您还可以将 sprite init 移动到创建场景的方法。

PS这只是示例代码。它并不意味着提供干净或良好的风格。