Starling无法访问空对象引用的属性或方法

Question

嘿，感谢任何帮助，我已经被资产经理搞得头晕目眩了几天了，这是我的夏威夷类，我正在尝试引用我的资产管理类(MapAssetLoadQeue)中的资产。并且我得到了空对象引用的不能访问属性或方法。错误，如果我没有(空)资产管理器引用，则在我的Hawaii类中抛出错误，并且在我的Loader类haw.showHawaii()中抛出该错误。

谢谢！

package Maps
{
import flash.filesystem.File;

import Enqueue.MapAssetLoadQeue;

import starling.animation.IAnimatable;
import starling.animation.Juggler;
import starling.core.Starling;
import starling.display.Image;
import starling.display.MovieClip;
import starling.display.Sprite;
import starling.events.Event;
import starling.textures.Texture;
import starling.textures.TextureAtlas;
import starling.utils.AssetManager;

public class Hawaii extends Sprite
{
    public var mal:MapAssetLoadQeue = new MapAssetLoadQeue;
    public var Ocean:Image;






    public function Hawaii():void{
        super();
        this.addEventListener   
                      (starling.events.Event.ADDED_TO_STAGE, showHawaii);
    }



    public function showHawaii(e:Event):void{



        if(mal.mapAssets != null) {

     Ocean = new Image(mal.mapAssets.getTexture("blue"));
     addChild(Ocean);
    Ocean.x = 0;
    Ocean.y = 0;
        }
    }

这是我加载资产的加载器类，也是我出错的地方。haw.showHawaii(null)函数。无法访问空对象引用的属性或方法。

package Assets {
import flash.filesystem.File;

import Enqueue.MapAssetLoadQeue;

import GUI.Wave;

import Maps.Hawaii;

import starling.animation.IAnimatable;
import starling.animation.Juggler;
import starling.core.Starling;
import starling.core.starling_internal;
import starling.display.Image;
import starling.display.MovieClip;
import starling.display.Sprite;
import starling.events.Event;
import starling.textures.Texture;
import starling.textures.TextureAtlas;
import starling.utils.AssetManager;


public class Loader extends Sprite {

    var loadText: Texture = Texture.fromEmbeddedAsset(loadMCTexture);
    var loadXml: XML = XML(new loadMC0Xml());
    var loaderAtlas: TextureAtlas = new TextureAtlas(loadText, loadXml);
    public var loaderMovie: MovieClip = new MovieClip(loaderAtlas.getTextures("loading_"));
    public var mal: MapAssetLoadQeue = new MapAssetLoadQeue;
    public var wave:Wave = new Wave;
    public var haw:Hawaii;





    //Loader MovieClip size 720X233;
    [Embed(source = "/../Wavehunter/loadScreenAssets/wm/MovieClips/loader/loader_0.xml", mimeType = "application/octet-stream")]
    public static const loadMC0Xml: Class;

    [Embed(source = "/../Wavehunter/loadScreenAssets/wm/MovieClips/loader/loader_0.png")]
    public static const loadMCTexture: Class;


    // public var juggler:Juggler = Starling.juggler;
    /*
    ======================================================================
    Every Movieclip asset for the worldMap
    > Load WorldMap Assets on stage as Png and Make all alpha to 30%
    > and within each function make that png invible to false or remove
    > add MoviClip over the invisible png after load is processed
    =======================================================================
    */







    // Load WorldMap asset function
    public function mapLoader(): void {
        mal.requestWM();
        addChild(loaderMovie);
        loaderMovie.x = 347;
        loaderMovie.y = 277;
        loaderMovie.play();
        Starling.juggler.add(loaderMovie);
    }
    public function mapLdr(){
        loaderMovie.visible = true;
        addChild(loaderMovie);
        loaderMovie.x = 347;
        loaderMovie.y = 277;
        loaderMovie.play();
        Starling.juggler.add(loaderMovie);
    }
    //this function resizes the loader to original size and places at the bottom corner
    public function resizeLdr(){
        loaderMovie.width = 72;
        loaderMovie.height = 22;
        loaderMovie.x =1237;
        loaderMovie.y = 712;
    }

    public function callLoad(): void {



    public function callHawaii(): void {
        trace(" Hawaii is being runned");
        //mal.mapAssets.verbose = true;

        mal.mapAssets.loadQueue(function onGo(ratio: Number): void {

            trace("Hawaii percentage is", ratio);
            if (ratio == 1.0) {
                Starling.juggler.delayCall(function (): void {
                    loaderMovie.visible = false;
                    //addChild(haw.Ocean);
                //  addChild(haw);
                    trace("this is haw value",haw);
                    //trace("this is the function", haw.showHawaii(null));
                    haw.showHawaii(null);

                }, 0.30);

            }
        });
    }









    public function showMap() {
        // get texture by name
        addChild(mal);
        mal.accesMap();
        mal.hawaii.addEventListener(Event.TRIGGERED,removeMap);


    }
    // this code removes the HawaiiMap from the screen and goes directly to the wave
    public function removeMap(){
        trace("function initated"); 
        mapLdr();
        resizeLdr();
        mal.mapAssets.purge();
        mal.requestHawaii();
        callHawaii();

            mal.hawaii.removeEventListener(Event.TRIGGERED,removeMap);


    }

    public function Loader() {
        super();
    }
}

}

这是我的Asset Manager类

package Enqueue {
import flash.filesystem.File;
import Assets.MapAnimate;
import Assets.MapAssets;
import Maps.Hawaii;
import starling.animation.IAnimatable;
import starling.animation.Juggler;
import starling.animation.Transitions;
import starling.animation.Tween;
import starling.core.Starling;
import starling.core.starling_internal;
import starling.display.Button;
import starling.display.Image;
import starling.display.MovieClip;
import starling.display.Sprite;
import starling.events.EnterFrameEvent;
import starling.events.Event;
import starling.textures.Texture;
import starling.textures.TextureAtlas;
import starling.utils.AssetManager;




public class MapAssetLoadQeue extends Sprite {
    public var mapAssets: AssetManager;

    public function MapAssetLoadQeue() {
        super();
    }


    public function requestHawaii():void {
        //  mapAssets.verbose =false;
    //  mapAssets = new AssetManager;
        var appDir:File = File.applicationDirectory;
        mapAssets.enqueue(appDir.resolvePath("IslandMaps/Hawaii"));
        //mapAssets.enqueue(Hawaii);
        mapAssets.verbose = true;
    }

Answer 1

如果这就是你所有的代码，如果我没有遗漏一些明显的东西，我不会看到你在任何地方创建"haw“。也就是说，你看起来没有像这样的东西。

haw = new Hawaii();

...so，它将是空的！