AndEngine Text.setText不起作用

Question

我创建了一个帮助类,它将根据我给出的自定义字体和文本返回Text对象.

这是代码:

public class CustomFontTextHelper {
    private Font font;
    private ITexture fontTexture; 
    private Text text;
    public Text getTextWithFont(String myText,String fontPath,BaseGameActivity activity,float x,float y,int fontsize,int color){
        fontTexture = new BitmapTextureAtlas(activity.getTextureManager(), 256, 256, TextureOptions.BILINEAR);
        FontFactory.setAssetBasePath("fonts/");
        this.font = FontFactory.createFromAsset(activity.getFontManager(), fontTexture, activity.getAssets(), fontPath, fontsize, true, color);
        this.font.load();
        text = new Text(x, y, this.font, myText, activity.getVertexBufferObjectManager());
        return text;
    }
}

使用这个帮助器类我创建一个文本并附加到我的场景.它的工作完美.但是当我尝试使用text.setText方法更改文本时,它会崩溃.

下面是我用来更改文本的代码.

public class StartingScreen extends BaseGameActivity {
    // ===========================================================
        // Constants
        // ===========================================================

        private static final int CAMERA_WIDTH = 480;
        private static final int CAMERA_HEIGHT = 720;

        // ===========================================================
        // Fields
        // ===========================================================

        public Text loadingPercentage;
        public float percentLoaded;
        public CustomFontTextHelper fontHelper;
    @Override
    public EngineOptions onCreateEngineOptions() {
        final Camera camera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);
        return new EngineOptions(true, ScreenOrientation.PORTRAIT_SENSOR, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), camera);
    }
    @Override
    public void onCreateResources(
            OnCreateResourcesCallback pOnCreateResourcesCallback)
            throws Exception {
        pOnCreateResourcesCallback.onCreateResourcesFinished();

    }
    @Override
    public void onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback)
            throws Exception {
        this.mEngine.registerUpdateHandler(new FPSLogger());
        final Scene scene = new Scene();
        scene.setBackground(new Background(0, 0, 0));
        fontHelper = new CustomFontTextHelper();
        percentLoaded = 0;
        loadingPercentage = fontHelper.getTextWithFont("0%", "MyriadPro-Cond.ttf", this, CAMERA_WIDTH-120, 100, 64, Color.BLACK);
        scene.attachChild(loadingPercentage);
        pOnCreateSceneCallback.onCreateSceneFinished(scene);
    }
    @Override
    public void onPopulateScene(Scene pScene,
            OnPopulateSceneCallback pOnPopulateSceneCallback) throws Exception {
        pOnPopulateSceneCallback.onPopulateSceneFinished();
        loadingPercentage.setText("5%");
        new Thread(new Runnable(){

            @Override
            public void run() {
                int incr;
                for (incr = 0; incr <= 100; incr+=5) {
                    StartingScreen.this.runOnUpdateThread(new Runnable(){

                        @Override
                        public void run() {
                            // TODO Auto-generated method stub
                            StartingScreen.this.loadingPercentage.setText(Float.toString(StartingScreen.this.percentLoaded) + "%");
                        }

                    });

                            try {
                                Thread.sleep(5*1000);
                            } catch (InterruptedException e) {

                            }
                }

                // TODO Auto-generated method stub

            }

        }).start();
        // TODO Auto-generated method stub

    }

请帮我解释一下代码.

Answer 1

据我所知,你正在使用AndEngine GLES2,因为Matim已经说过你可以改变Text实例.问题是,当你Text第一次需要包含一些文本或更好的文本来实例化对象时,你应该告诉对象它必须保持多少个字母(最大).而不是

 text = new Text(x, y, this.font, myText, activity.getVertexBufferObjectManager());

你做

 int textLength = 4;
 text = new Text(x, y, this.font, myText, textLength, activity.getVertexBufferObjectManager());

我只是将长度设置为4,因为你将它用作百分比,只能在0%到100%之间,所以最多4个字母.当然,您可以根据需要设置文本长度,如果将其设置为1000并且只在文本中放置"hello",那么它很好(如果可以的话,可以将它们设置为小以节省内存).

你之后无法重置文本大小 - 这意味着,一旦你创建了一个Text object长度为5的你不能在其中放入6个字母,你也不能调用像setSize(6)那样的东西......那是行不通的.

我希望这有帮助!

• 克里斯托夫