java - Android AndEngine 生成随机 Sprite 奇怪的问题

Question

首先我从加载资源开始

                this.mTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(), 130, 130);
                this.m1TextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mTextureAtlas, this, "p1.png", 0, 0);
                this.m2TextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mTextureAtlas, this, "p2.png", 0, 0);
                this.m3TextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mTextureAtlas, this, "p3.png", 0, 0);
                this.m4TextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mTextureAtlas, this, "p4.png", 0, 0);
                this.mTextureAtlas.load();

那我做

int x;
                x = MathUtils.random(1, 4);
                Log.e("euatl", "is" + x);

                p = null;

                if(x == 1){
                    p = new Sprite(mCameraWidth-pX, pY, this.mB1TextureRegion, this.getVertexBufferObjectManager());
                } else if(x == 2){
                    p = new Sprite(mCameraWidth-pX, pY, this.m2TextureRegion, this.getVertexBufferObjectManager());         
                } else if(x == 3){
                    p = new Sprite(mCameraWidth-pX, pY, this.mB3TextureRegion, this.getVertexBufferObjectManager());

                } else if(x == 4){
                    p = new Sprite(mCameraWidth-pX, pY, this.m4TextureRegion, this.getVertexBufferObjectManager()); 
                }

                    mScene.attachChild(p);

目前总是生成 p4 Sprite ，TextureAtlas 中的最后一个 Sprite 。我的 logcat 说 x 有时是随机的 1、2、3 和 4。但在手机中， Sprite 总是最后一个 (p4)

Answer 1

您需要将您的纹理放在图集的不同位置。假设您的纹理 (px.png) 大小为 130x130:

            this.mTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(), 4 * 130, 130);
            this.m1TextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mTextureAtlas, this, "p1.png", 0, 0);
            this.m2TextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mTextureAtlas, this, "p2.png", 130, 0);
            this.m3TextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mTextureAtlas, this, "p3.png", 260, 0);
            this.m4TextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mTextureAtlas, this, "p4.png", 390, 0);
            this.mTextureAtlas.load();

更好的解决方案:

int textureCount = 4;
TextureRegion[] mTextureRegions = new TextureRegion[textureCount];

for (int i = 0; i < mTextureRegions.length; i++)
   this.mTextureRegions[i] = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mTextureAtlas, this, "p" + (i + 1) + ".png", i * 130, 0);
this.mTextureAtlas.load();