回调函数模型

 

public class Parent{

 

.................

...............

 

private ScrollToScreenCallback scrollToScreenCallback;

 

interface ScrollToScreenCallback {

public void callback(int currentIndex);

}

 

public void setScrollToScreenCallback(ScrollToScreenCallback scrollToScreenCallback) {

this.scrollToScreenCallback = scrollToScreenCallback;

}

 

public void test(){

scrollToScreenCallback.callback(1);

}

 

}

 

 

 

public class child implements ScrollToScreenCallback {

 

private Parent parent;

...........

public void callback(int currentIndex){

.......

 

parent.setScrollToScreenCallback(this);//注意这里要注册回调方法

}

 

 

}