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If you were already using TP 2, please have a look at our Migration guide to start using TP 3.

Toothpick (alias TP) in a one sentence :

TP is a scope tree based Dependency Injection (DI) library.

TP in a nutshell :

• What is a scope?
• Injections and instance creations take place within scopes.
• If ToothPick creates an instance, it will inject its dependencies.
• TP always bubbles up the tree of scopes, never down.
• A scope contains bindings and singletons.
• Children scopes inherit bindings, they can override them.
• Children scopes can access their parents' bindings & singletons.
• A scope can be bound to a scope annotation.
• Using a scope annotation is the same as scoping a binding.

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//a typical Toothpick scope tree during the execution of an Android app.

           @ApplicationScope 
             /          |    \  
            /           |     \
           /            |      \
   @ViewModelScope      |   Service 2
         /              | 
        /            Service 1  
       /            
 @Activity1Scope
      /
     /
Activity 1
   /   \
  /   Fragment 2
 /
Fragment 1

One of the goals of the Toothpick development team is to document Toothpick properly. This wiki is part of our effort as well as the code comments and javadoc.