无法在屏幕上加载位图纹理图集答案

【问题标题】：Trouble loading bitmap texture atlas on screen无法在屏幕上加载位图纹理图集
【发布时间】：2016-12-10 06:16:07
【问题描述】：

我正在使用 AndEngine GLES2，我尝试在手机上加载图像，但我得到的是黑屏

下面是我的代码：

public class BaseActivity extends SimpleBaseGameActivity {

static final int CAMERA_WIDTH = 800;
static final int CAMERA_HEIGHT = 480;

public Font mFont;
public Camera mCamera;

private MainMenuScene mainMenuScene;
public Engine mEngine;
public Scene mScene;
public BuildableBitmapTextureAtlas mBitmapTextureAtlas;
public ITextureRegion mITextureRegion;



@Override
public EngineOptions onCreateEngineOptions() {

    instance = this;
    mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);

    return new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), mCamera);
}

@Override
protected void onCreateResources() {

    mFont = FontFactory.create(this.getFontManager(), this.getTextureManager(), 256, 256, Typeface.create(Typeface.DEFAULT, Typeface.BOLD), 32);
    mFont.load();

    BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");
    mBitmapTextureAtlas = new BuildableBitmapTextureAtlas(this.getTextureManager(), 256, 256, TextureOptions.BILINEAR);
    mITextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(mBitmapTextureAtlas, this, "splash1.png");
    try {
        mBitmapTextureAtlas.build(new BlackPawnTextureAtlasBuilder<IBitmapTextureAtlasSource, BitmapTextureAtlas>(0, 1, 1));
    } catch (TextureAtlasBuilderException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    mBitmapTextureAtlas.load();
}

@Override
protected Scene onCreateScene() {

    final float positionX = CAMERA_WIDTH * 0.5f;
    final float positionY = CAMERA_HEIGHT * 0.5f;
    Sprite mSprite = new Sprite(positionX, positionY, mITextureRegion, mEngine.getVertexBufferObjectManager());
    mScene.attachChild(mSprite);
    return mCurrentScene;
}

Logcat 显示我的 onCreateResources 和 onCreateScene 中有一个 nullPointerException，我不知道出了什么问题。可能是什么问题？

【问题讨论】：

标签： android image textures andengine

【解决方案1】：

一个错误是因为您从未创建场景对象，然后尝试将精灵附加到它，另一个是 VertexbufferObjectManager 不是 Engine 类的，而是 SimpleBaseGameActivity 类的。 onCreateScene() 变为：

    @Override
    protected Scene onCreateScene() {

        mScene = new Scene();
        final float positionX = CAMERA_WIDTH * 0.5f;
        final float positionY = CAMERA_HEIGHT * 0.5f;
        Sprite mSprite = new Sprite(positionX, positionY, mITextureRegion, getVertexBufferObjectManager());
        mScene.attachChild(mSprite);
        return mScene;
    }

我还注释掉了一些变量以使其构建，尽管我怀疑这些是由于剥离了您的代码示例：

//        private MainMenuScene mainMenuScene;
//        instance = this;

【讨论】：