Libgdx 可点击对象？

Question

有人可以解释一下如何检测对象的点击吗？我已经看到了这个问题的答案，但它不起作用。

public class TiledMapActor extends Actor {

    private TiledMap tiledMap;

    private TiledMapTileLayer tiledLayer;

    private TiledMapTileLayer.Cell cell;

    public TiledMapActor(TiledMap tiledMap, TiledMapTileLayer tiledLayer, TiledMapTileLayer.Cell cell) {
        this.tiledMap = tiledMap;
        this.tiledLayer = tiledLayer;
        this.cell = cell;
    }

}

public class TiledMapClickListener extends ClickListener {

    private TiledMapActor actor;

    public TiledMapClickListener(TiledMapActor actor) {
        this.actor = actor;
    }

    @Override
    public void clicked(InputEvent event, float x, float y) {
        System.out.println(actor.cell + " has been clicked.");
    }
}




public class TiledMapStage extends Stage {

    private TiledMap tiledMap;

    public TiledMapStage(TiledMap tiledMap) {
        this.tiledMap = tiledMap;

        for (MapLayer layer : tiledMap.getLayers()) {
            TiledMapTileLayer tiledLayer = (TiledMapTileLayer)layer; //THE ERROR IS IN THIS LINE
            createActorsForLayer(tiledLayer);
        }
    }

    private void createActorsForLayer(TiledMapTileLayer tiledLayer) {
        for (int x = 0; x < tiledLayer.getWidth(); x++) {
            for (int y = 0; y < tiledLayer.getHeight(); y++) {
                TiledMapTileLayer.Cell cell = tiledLayer.getCell(x, y);
                TiledMapActor actor = new TiledMapActor(tiledMap, tiledLayer, cell);
                actor.setBounds(x * tiledLayer.getTileWidth(), y * tiledLayer.getTileHeight(), tiledLayer.getTileWidth(),
                        tiledLayer.getTileHeight());
                addActor(actor);
                EventListener eventListener = new TiledMapClickListener(actor);
                actor.addListener(eventListener);
            }
        }
    }
}

Stage stage = new TiledMapStage(tiledMap);
Gdx.input.setInputProcessor(stage);

我已经尝试使用此代码，但收到以下错误消息：

 com.badlogic.gdx.maps.MapLayer cannot be cast to com.badlogic.gdx.maps.tiled.TiledMapTileLayer

我不明白如何选择可点击的对象

Answer 1

正如您已经发现的那样，问题在于您的选角：

for (MapLayer layer : tiledMap.getLayers()) {
    TiledMapTileLayer tiledLayer = (TiledMapTileLayer)layer;

看起来图层不是 TiledMapTileLayer 类型 - 或者至少不是所有图层。 （Afaik TiledMap 中也有 ObjectLayers）让您的代码再次运行的最简单的方法是使用 instanceof 检查：

for (MapLayer layer : tiledMap.getLayers()) {
    if (layer instanceof TiledMapTileLayer) {
        TiledMapTileLayer tiledLayer = (TiledMapTileLayer)layer;
        createActorsForLayer(tiledLayer);
    }