Making Classes Variable

Can any one tell me if there i开发者_高级运维s a way, and if so how to, make an activity implement an entire class based on an if then or switch statement, essentially making the class itself a variable? [I want to display a particular list class (activity) in a tab depending on a value received from an OnItemClicked event in another tab].

To give you an idea of what I think I might be looking for:

if(position == 1){//run class 1}

if(position == 2){//run class 2}

THANKS.

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Are you looking for polymorphism?

interface MyService {
   void doWork();
}

class CoolMyService {
   void doWork() { /* do something */ }
}

class AnotherMyService {
   void doWork() { /* do something else */ }
}

MyService service;
if(position == 1){ service = new CoolMyService(); }

if(position == 2){ service = new AnotherMyService() } 

service.doWork();

I don't know how many items there are in your list, but you can adapt the example above to load objects dynamically as appropriate. Just remember that you can use polymorphism and a defined interface to ensure integrity. Then put the real work in concrete implementations.

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You might want a (n abstract) factory pattern.

Take a look at it inside the Java Design Patterns

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You can use broadcast receiver

if (position == 1){
    sent broadcast event to one class 
}if(position === 2){
    sent broadcast event to another class

}

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You could also look into using Class.forName()

Class oClass = Class.forName(strClassName);
Tab myTab = (Tab) oClass.newInstance();

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I'm not sure I understand your problem.

My first solution would be implementing the factory pattern with dependency injection, passing the class as an argument to the factory method:

code:

Class impClass;
if (position == 1) {
  impClass = First.class;
} else if (position == 1) {
  impClass = Second.class;
}
Object myObject = ObjectFactory.createObject(impClass);

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Abstract factory or prototype patterns fit your needs http://en.wikipedia.org/wiki/Prototype_pattern