[Kotlin](object:) object expression and object declaration

Sometimes, we need to create an object of a class that slightly changes a class without explicitly declaring a new subclass for it. Java handles this situation with anonymous inner classes . Kotlin briefly summarizes this concept with object expressions and object declarations .

 

in JAVA:

DataBindingUtils.addCallBack(this, mActivityVM.goToSimple,
   new Observable.OnPropertyChangedCallback() {
     @Override
     public void onPropertyChanged(Observable observable, int i) {
        goToBase ();
}
});

 

in Kotlin:

DataBindingUtils.addCallBack (
                this,
                mainActivityVM? .goToSimple,
                object : Observable.OnPropertyChangedCallback() {
                    override fun onPropertyChanged(p0: Observable?, p1: Int) {
                        
                    }

                })

 Use object to process, if you use java to process anonymous inner classes, an error will be reported