用TexturePacker (AndEngine)加载纹理

Question

我用TexturePacker。我整理了我的纹理，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sample.java项目。

我有这样的代码：

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sprite，我在这一行中得到一个错误：

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)

我犯了什么错？

Answer 1

我假设问题是在执行Sprite spriteS之前尝试初始化onLoadResources()。

像这样的东西也许能帮到你：

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中。

这只是个示例代码。它不是为了提供干净或良好的风格。