Java 例外情况:;未提供默认构造函数";异常子类化ParseObject
我有两个类Java 例外情况:;未提供默认构造函数";异常子类化ParseObject,java,android,oop,inheritance,parse-platform,Java,Android,Oop,Inheritance,Parse Platform,我有两个类newimage和EventImage,它们几乎相同,因此它们继承自Image抽象类。这两个都代表我的解析数据库中的一个类 public abstract class Image extends ParseObject { public Image(){}; public String getImageId(){ return getObjectId(); } public void setImageId(String imageI
newimage
和EventImage
,它们几乎相同,因此它们继承自Image
抽象类。这两个都代表我的解析数据库中的一个类
public abstract class Image extends ParseObject {
public Image(){};
public String getImageId(){
return getObjectId();
}
public void setImageId(String imageId){
setObjectId(imageId);
}
public byte[] getImageBytes(){
try {
return getParseFile("image").getData();
} catch (ParseException e) {
e.printStackTrace();
return null;
}
}
public void setImageBytes(byte[] bytes){
put("image", new ParseFile(bytes));
}
public Bitmap getBitmap(){
return Toolbox.ByteArrayToBitmap(getImageBytes());
}
事件图像类
@ParseClassName("OSW_event_images")
public class EventImage extends Image {
public EventImage() {
super();
}
public Event getEvent(){
return (Event) getParseObject("event");
}
public void setEvent(Event event){
put("event", event);
}
};
新闻图像类
@ParseClassName("OSW_news_images")
public class NewsImage extends Image {
public NewsImage() {
super();
}
public News getNews(){
return (News) getParseObject("news");
}
public void setNews(News event){
put("news", event);
}
};
}
在调用Parse.initialize()
运行此操作后,我得到:
09-19 12:38:39.794: E/AndroidRuntime(25806): java.lang.RuntimeException: Unable to start activity ComponentInfo{pl.holdapp.osw/pl.holdapp.osw.activities.MainActivity}: java.lang.IllegalArgumentException: No default constructor provided for class pl.holdapp.osw.objects.Image$EventImage
09-19 12:38:39.794: E/AndroidRuntime(25806): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305)
将EventImage类设置为静态。现在,默认构造函数需要对外部类进行隐式引用。问题在于EventImage不是静态嵌套类。。。没有外部映像类实例,它无法存在
pl.holdapp.osw.objects.Image$EventImage
最终,我把它们都从我的抽象Image
类中放了出来,但你肯定是对的,如果不实例化Image,这些类就不可能存在。
09-19 12:38:39.794: E/AndroidRuntime(25806): java.lang.RuntimeException: Unable to start activity ComponentInfo{pl.holdapp.osw/pl.holdapp.osw.activities.MainActivity}: java.lang.IllegalArgumentException: No default constructor provided for class pl.holdapp.osw.objects.Image$EventImage
09-19 12:38:39.794: E/AndroidRuntime(25806): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305)