Java Firestore在检索类时崩溃，请求空构造函数，但已经有一个构造函数
这一行：Java Firestore在检索类时崩溃，请求空构造函数，但已经有一个构造函数,java,android,google-cloud-firestore,Java,Android,Google Cloud Firestore,这一行： ProjectMap m = document.toObject(ProjectMap.class); 生成错误： E/AndroidRuntime:致命异常：主 进程：com.dockdogs.lorecords，PID:5633 java.lang.RuntimeException:无法反序列化对象。类com.dockdogs.lorecords.preferences.MapPreference$Bubble未定义无参数构造函数。如果您使用的是ProGuard，请确保未剥离这些
ProjectMap m = document.toObject(ProjectMap.class);
public class ProjectMap implements Serializable {
public int height=0;
public int width=0;
public String id = "";
public int scaleRatio = 1; //FOR ZOOMING THE MAP IN AND OUT
public String mapTitle, mapPath; //map path = image path
public boolean ISCURRENT = false; //the map that's currently being used by the user
public ArrayList<MapEvent> mapEvents = new ArrayList<MapEvent>();
private MapPreference preferences = new MapPreference();
}
public class MapPreference implements Serializable {
//Controls scale for map bitmap
public float minScaleX = 0.50f;
public float maxScaleX = 8f;
public float minScaleY = 0.50f;
public float maxScaleY = 8f;
//end controls for scaling map bitmap
public Dagger mapDagger = new Dagger();
public Bubble mapBubble = new Bubble();
public boolean useGridLines = true;
public int gridCols = 0;
public int gridRows = 0;
public MapPreference() {
}
public void setGridRows(int gridRows) { this.gridRows = gridRows; }
public void setGridCols(int gridCols) { this.gridCols = gridCols; }
//will the user have grid lines on their map?
public void setUseGridLines(boolean useGridLines) { this.useGridLines = useGridLines; }
public boolean GetUseGridLines() { return useGridLines; }
public int GetGridCols(){
return gridCols;
}
public int GetGridRows(){
return gridRows;
}
public float GetMinScaleX(){
return minScaleX;
}
public float GetMinScaleY(){
return minScaleY;
}
public float GetMaxScaleX(){
return maxScaleX;
}
public float GetMaxScaleY(){
return maxScaleY;
}
//TODO: add a preferences page for these options
public void SetMinScaleX(float _minScaleX){
minScaleX = _minScaleX;
}
public void SetMinScaleY(float _minScaleY){
minScaleY = _minScaleY;
}
public void SetMaxScaleX(float _maxScaleX){
maxScaleX = _maxScaleX;
}
public void SetMaxScaleY(float _maxScaleY){
maxScaleY = _maxScaleY;
}
public class Dagger implements Serializable {
public float minScaleX = 0.75f;
public float maxScaleX = 1f;
public float minScaleY = 0.75f;
public float maxScaleY = 1f;
public float GetMinScaleX(){
return minScaleX;
}
public float GetMinScaleY(){
return minScaleY;
}
public float GetMaxScaleX(){
return maxScaleX;
}
public float GetMaxScaleY(){
return maxScaleY;
}
//TODO: add a preferences page for these options
public void SetMinScaleX(float _minScaleX){
minScaleX = _minScaleX;
}
public void SetMinScaleY(float _minScaleY){
minScaleY = _minScaleY;
}
public void SetMaxScaleX(float _maxScaleX){
maxScaleX = _maxScaleX;
}
public void SetMaxScaleY(float _maxScaleY){
maxScaleY = _maxScaleY;
}
public Dagger(){
}
}
public class Bubble implements Serializable {
public float minScaleX = 0.75f;
public float maxScaleX = 1f;
public float minScaleY = 0.75f;
public float maxScaleY = 1f;
public float GetMinScaleX(){
return minScaleX;
}
public float GetMinScaleY(){
return minScaleY;
}
public float GetMaxScaleX(){
return maxScaleX;
}
public float GetMaxScaleY(){
return maxScaleY;
}
//TODO: add a preferences page for these options
public void SetMinScaleX(float _minScaleX){
minScaleX = _minScaleX;
}
public void SetMinScaleY(float _minScaleY){
minScaleY = _minScaleY;
}
public void SetMaxScaleX(float _maxScaleX){
maxScaleX = _maxScaleX;
}
public void SetMaxScaleY(float _maxScaleY){
maxScaleY = _maxScaleY;
}
public Bubble() {
}
}
}
此外，这不是一个重复的问题，因为该类已经有一个空构造函数，它仍然抛出错误。这些类中的一些类似乎是其他类的内部类。在这种情况下，还需要将内部类标记为
staticouterstatic public class Bubble ...