我正在从 XML 列表创建一个数组，如下所示:
Array<Element> a = root.getChildrenByName("Element name");
我试图通过索引获取 XML 数据，但这不起作用。
int result = a.get(i).getInt("attribute name"); //Does not change anything to the result.
int result = tiles.items[i].getInt("attribute name"); //Results in an error.
我尝试将其转换为常规数组[]，但这也不起作用。当调试我从 xml 文件创建的数组时，将鼠标悬停在数组上时，我可以看到底部写入的 XML，但我无法在其中看到实际的“arraytree”。
[<element att="value"/>, <element att="value"/>, ...]
当我尝试将此数组转换为普通 array[] 或 ArrayList 或类似的内容时，我得到:
Exception in thread "LWJGL Application" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Lcom.badlogic.gdx.utils.XmlReader$Element;
发布我的完整代码块和 XML:
public static Tile[][] LoadMap(String file)
{
Tile[][] map = new Tile[0][0];
XmlReader xml = new XmlReader();
try {
Element root = xml.parse(Gdx.files.internal(file));
int width = root.getInt("width");
int height = root.getInt("height");
map = new Tile[width][height];
map = new Tile[width][height];
for (XmlReader.Element l : root.getChildrenByName("layer"))
{
//Populate floor tiles
if (l.getAttribute("name").equals("floor"))
{
Element data = l.getChildByName("data");
Array<Element> tiles = data.getChildrenByName("tile");
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
map[x][y] = new Tile();
map[x][y].tileTexture = tiles.get(x+y).getInt("gid");
//add properties since we know it uses the floor tileset.
}
}
}
//Populate wall tiles
else if (l.getAttribute("name").equals("wall"))
{
Element data = l.getChildByName("data");
Array<Element> tiles = data.getChildrenByName("tile");
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width;x++)
{
map[x][y].wallTexture = tiles.get(x+y).getInt("gid");
//add properties since we know it uses the wall tileset.
}
}
}
}
这运行良好，if 语句通过，并且每次运行的每一行代码都将至少被读取一次。
XML(对于较小尺寸的 map 可能更实用，但这只是 10x10):
<map version="1.0" width="10" height="10" tilewidth="64" tileheight="32">
<tileset firstgid="1" name="tilesheet01" tilewidth="66" tileheight="33">
<image source="tilesheet01.png" width="462" height="495"/>
</tileset>
<tileset firstgid="106" name="wallsheet01" tilewidth="66" tileheight="140">
<image source="wallsheet01.png" width="990" height="980"/>
<tile id="0">
<properties>
<property name="eWall" value="0"/>
<property name="nWall" value="1"/>
</properties>
</tile>
<tile id="1">
<properties>
<property name="eWall" value="1"/>
<property name="nWall" value="0"/>
</properties>
</tile>
<tile id="2">
<properties>
<property name="eWall" value="1"/>
<property name="nWall" value="1"/>
</properties>
</tile>
</tileset>
<layer name="floor">
<data>
<tile gid="110"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="1"/>
<tile gid="2"/>
<tile gid="3"/>
<tile gid="4"/>
<tile gid="5"/>
<tile gid="6"/>
<tile gid="7"/>
<tile gid="8"/>
<tile gid="9"/>
<tile gid="10"/>
<tile gid="11"/>
</data>
</layer>
<layer name="wall">
<data>
<tile gid="200"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="108"/>
<tile gid="107"/>
<tile gid="107"/>
<tile gid="107"/>
<tile gid="107"/>
<tile gid="106"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="109"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="106"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="106"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="106"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="106"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="106"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="107"/>
<tile gid="106"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="108"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="107"/>
<tile gid="110"/>
<tile gid="107"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
<tile gid="0"/>
</data>
</layer>
</map>
最佳答案
这里有一个逻辑错误:
tiles.get(x+y).getInt("gid");
这将导致它按以下顺序遍历图 block 元素:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
...依此类推，直到元素 19。由于除了第一个之外，前 20 个图 block 的所有值都相同，这解释了您所看到的行为。您应该使用的是:
tiles.get(x + y * width).getInt("gid");
关于java - 如何通过索引获取该数组中的元素？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25453011/