[英]read java.util.Map<String,?> from a file
我从保存到首选项文件的地图中获取值时遇到问题。 我可以从地图中打印出键,但是没有任何值。 我认为这与我正在进行的类型转换有关,但是我已经尝试了所有我所知道的并且无法弄清楚的东西。
我测试了保存到首选项文件中的映射中的值,它们的输出效果很好。
我尝试了以下建议,但没有帮助
这是我的代码
public class SetSettings {
private Actor actor;
private Actor hit;
private Sprite sprite;
private Sprite sprite2;
private Rectangle rect;
private boolean customHit = false;
private ShapeRenderer render = new ShapeRenderer();
public float y;
public float x;
Array<Actor> actors = GameScreen.buttons.stage.getActors();
public SetSettings() {
setOriginal();
setCustom();
rect = new Rectangle();
}
public void setOriginal() {
learnGame.ass.settings.get().clear();
float height = Gdx.graphics.getHeight();
float width = Gdx.graphics.getWidth();
// ui settings
java.util.Map<String, Coords> map = new HashMap<String, Coords>();
map.put("hpBar", new Coords(width - (learnGame.ass.hpBar.getWidth() * 1.02f), height - (height * .076f)));
map.put("hpBase", new Coords(learnGame.ass.hpBar.getX(), learnGame.ass.hpBar.getY()));
for (Entry<String, Coords> key : map.entrySet())
System.out.println(key.getValue().x); // works fine here
}
public void setCustom() {
java.util.Map<String, Coords> amap = (java.util.HashMap<String, Coords>) learnGame.ass.settings.get();
// Float[] nums = amap.get("hpBar");
for (Entry<String, Coords> key : amap.entrySet()) {
// /float t = key.getValue().x; // <-----------error here -- java.lang.String cannot be cast
System.out.println("6" + key.getKey());
// String xz = key.getValue();
}
}
public class Coords {
float x;
float y;
public Coords(float x, float y) {
this.x = x;
this.y = y;
}
}
}
您应该从共享首选项进行保存/加载,例如此处给出的示例
//persist
HashMap<String, Integer> counters; //the hashmap you want to save
SharedPreferences pref = getContext().getSharedPreferences("Your_Shared_Prefs", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = pref.edit();
for (String s : counters.keySet()) {
editor.putInteger(s, counters.get(s));
}
editor.commit();
//load
SharedPreferences pref = getContext().getSharedPreferences("Your_Shared_Prefs", Context.MODE_PRIVATE);
HashMap<String, Integer> map= (HashMap<String, Integer>) pref.getAll();
for (String s : map.keySet()) {
Integer value=map.get(s);
//Use Value
}
您需要查看您在Coords中使用的方法的返回值,并使用适当键入的变量来存储这些返回值。
这样的事情应该没有问题:
for (Entry<String, Coords> key : amap.entrySet()) {
float x_value = key.getValue().getX();
float y_value = key.getValue().getY();
}
应该与吸气剂一起正常工作:
public class Coords {
float x;
float y;
public Coords(float x, float y) {
this.x = x;
this.y = y;
}
public float getX(){
return this.x;
}
public float getY(){
return this.y;
}
}
您要做的是:
float t = Float.parseFloat(theString);
您还应该捕获一个"NumberFormatException"
您的问题在这里:
java.util.Map<String, Coords> amap = (java.util.HashMap<String, Coords>) learnGame.ass.settings.get();
您不能只将Map<String, ?>
为HashMap<String, Coords>
! 不是TypeSafe!
试试这样:
Map<String, ?> settings = learnGame.ass.settings.get();
for (Entry<String, ?> entry : settings.entrySet()) {
if (entry.getValue() instanceof Coords) {
Coords coords = (Coords) entry.getValue();
// do some with coords
}
}
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