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我試圖使用傑克遜序列化我的Character對象。該mapper.writeValue方法調用成功似乎，但是當我嘗試使用mapper.readValue的閱讀價值，我得到了以下錯誤消息：傑克遜找不到適合於android.graphics.Bitmap的構造函數
com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of android.graphics.Bitmap: no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?)
at [Source: [email protected]; line: 1, column: 199] (through reference chain: java.lang.Object[][0]->com.myproj.character.Character["compositeClothes"]->com.myproj.character.clothing.CompositeClothing["clothes"]->java.util.ArrayList[0]->com.myproj.character.clothing.concrete.Hat["bitmap"])
這些都是我的課：
@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, include = JsonTypeInfo.As.PROPERTY, property = "@class")
@JsonSubTypes({
@JsonSubTypes.Type(value = Hat.class, name = "hat"),
@JsonSubTypes.Type(value = Necklace.class, name = "necklace"),
@JsonSubTypes.Type(value = Shirt.class, name = "shirt")
})
public interface Clothing {
int getCoolness();
int getrId();
Bitmap getBitmap();
}
我的帽子類：
public class Hat implements Clothing {
private int rId;
private int coolness;
private Bitmap bitmap;
@JsonCreator
public Hat(@JsonProperty("coolness") int coolness, @JsonProperty("bitmap") Bitmap bitmap) {
rId = R.id.hat_image;
this.coolness = coolness;
this.bitmap = bitmap;
}
public int getrId() {
return rId;
}
@Override
public int getCoolness() {
return coolness;
}
public Bitmap getBitmap() {
return bitmap;
}
}
我複合服裝類：
public class CompositeClothing implements Clothing, Iterable<Clothing> {
@JsonProperty("coolness")
private int coolness = 0;
private List<Clothing> clothes = new ArrayList<>();
public void add(Clothing clothing) {
clothes.add(clothing);
}
public void remove(Clothing clothing) {
clothes.remove(clothing);
}
public Clothing getChild(int index) {
if (index >= 0 && index < clothes.size()) {
return clothes.get(index);
} else {
return null;
}
}
@Override
public Iterator<Clothing> iterator() {
return clothes.iterator();
}
@Override
public int getCoolness() {
return coolness;
}
@Override
public int getrId() {
return 0;
}
@Override
public Bitmap getBitmap() {
return null;
}
}
而且我的性格類：
public class Character implements Observable {
private static final transient Character instance = new Character();
@JsonProperty("compositeClothes")
private CompositeClothing clothes = new CompositeClothing();
@JsonProperty("compositeHeadFeatures")
private CompositeHeadFeature headFeatures = new CompositeHeadFeature();
private transient List<Observer> observers = new ArrayList<>();
@JsonProperty("skin")
private Skin skin;
public void attach(Observer observer) {
observers.add(observer);
}
public void notifyAllObservers() {
for (Observer observer : observers) {
observer.update();
}
}
public void setSkin(Skin skin) {
this.skin = skin;
notifyAllObservers();
}
public Skin.Color getSkinColor() {
return skin.getColor();
}
public Bitmap getSkinBitmap() {
return skin.getBitmap();
}
public boolean hasSkin() {
return skin != null;
}
public void addClothing(Clothing clothing) {
Clothing oldClothing = (Clothing) getSameTypeObjectAlreadyWorn(clothing);
if (oldClothing != null) {
clothes.remove(oldClothing);
}
clothes.add(clothing);
notifyAllObservers();
}
public CompositeClothing getClothes() {
return clothes;
}
private Object getSameTypeObjectAlreadyWorn(Object newClothing) {
Class<?> newClass = newClothing.getClass();
for (Object clothing : clothes) {
if (clothing.getClass().equals(newClass)) {
return clothing;
}
}
return null;
}
public void removeClothing(Clothing clothing) {
clothes.remove(clothing);
}
public void addHeadFeature(HeadFeature headFeature) {
HeadFeature oldHeadFeature = (HeadFeature) getSameTypeObjectAlreadyWorn(headFeature);
if (oldHeadFeature != null) {
headFeatures.remove(oldHeadFeature);
}
headFeatures.add(headFeature);
notifyAllObservers();
}
public void removeHeadFeature(HeadFeature headFeature) {
headFeatures.remove(headFeature);
}
public CompositeHeadFeature getHeadFeatures() {
return headFeatures;
}
public static Character getInstance() {
return instance;
}
}
，我使用堅持，然後讀取數據的代碼：
File charactersFile = new File(getFilesDir() + File.separator + "characters.ser");
ObjectMapper mapper = new ObjectMapper()
.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.NONE)
.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
try (FileWriter fileOut = new FileWriter(charactersFile, false)) {
List<Character> characters = Arrays.asList(character);
mapper.writeValue(fileOut, characters);
} catch (IOException e) {
e.printStackTrace();
}
Character[] characters = null;
try (FileReader fileIn = new FileReader(charactersFile)) {
characters = mapper.readValue(fileIn, Character[].class);
} catch (IOException e) {
e.printStackTrace();
}
謝謝！
把一個' JSON中的位圖需要將其轉換爲一些文本格式（例如base64）。我會推薦做其他事情，而不是試圖把位圖放入JSON中。這些位圖來自哪裏？ – CommonsWare
來自我隨應用附帶的資產。也許我可以將我的位圖轉換爲一個字節[]，或者只是使用路徑？事情是新的，「布料」將在稍後由用戶添加到應用中，並且這些將被存儲在內部存儲裝置中，這將使得我想要定位它更難一些。 – masm64