@Init

Syntax

@Init

@Init(superclass=true)

Description

Target: method

Purpose: Marker annotation to identify a initial method.

Binder calls the method with this annotation when initializing a ViewModel. Only one or none init method is allowed in a ViewModel class. If you set annotation element superclass to true, the ViewModel's parent class's ini method will be invoked first then child's, and this logic repeat on super class. If a class has no method with @Init, no method will be called (including the super class's).

For example, in class hierarchy A(has init) <- B(has init) <- C(no init) <- D (has init, superclass true). D is the last child class.

• When binder initializes D as a view model, it will call D's initial method.
• When binder initializes C, no method will be called.
• When binder initializes B , it will call As' then B's.
• When binder initializes A, it will call A's.

We also can use parameter related annotation on initial method's parameters, please refer to subsections of ZK Developer's Reference/MVVM/Syntax/ViewModel/Parameters.

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Example

public class MyViewModel{
	@Init
	public void initialize(){
		//initializing
	}
}

public class FooViewModel{
	@Init
	public void initFoo(){
		//initializing
	}
}

public class BarViewModel extends FooViewModel{
	@Init(superclass=true)
	public void initBar(){
		//initial method of super class FooViewModel will be called first.
	}
}

Version History

Version	Date	Content
6.0.0	February 2012	The MVVM was introduced.