Dagger is a fully static, compile-time dependency injection framework for both Java and Android. It is an adaptation of an earlier version created by Square and now maintained by Google.  It eliminates all reflection, and improves code clarity by removing the traditional ObjectGraph/Injector in favor of user-specified @Component interfaces.

Dagger 2 -  Compile-time dependency injection framework for both Java and Android

Guice (pronounced 'juice') is a lightweight dependency injection framework for Java 6 and above, brought to you by Google. Guice alleviates the need for factories and the use of new in your Java code. Think of Guice's @Inject as the new new. You will still need to write factories in some cases, but your code will not depend directly on them. Your code will be easier to change, unit test and reuse in other contexts.

Guice - Lightweight Dependency Injection Framework for Java

A fast dependency injector for Android and Java. Dagger is a replacement for these FactoryFactory classes. It allows you to focus on the interesting classes. Declare dependencies, specify how to satisfy them, and ship your app. By building on standard javax.inject annotations (JSR-330), each class is easy to test. 

Dagger v1 - A fast dependency injector for Android and Java.

Field and method binding for Android views which uses annotation processing to generate boilerplate code for you. Annotate fields with @BindView and a view ID for Butter Knife to find and automatically cast the corresponding view in your layout. Instead of slow reflection, code is generated to perform the view look-ups. Calling bind delegates to this generated code that you can see and debug.
<ul>
<li>Eliminate <code>findViewById</code> calls by using <code>@BindView</code> on fields.</li>
<li>Group multiple views in a list or array. Operate on all of them at once with actions,
setters, or properties.</li>
<li>Eliminate anonymous inner-classes for listeners by annotating methods with <code>@OnClick</code> and others.</li>
<li>Eliminate resource lookups by using resource annotations on fields.</li>
</ul>

Field and method binding for Android views which uses annotation processing to generate boilerplate code for you. Annotate fields with @BindView and a view ID for Butter Knife to find and automatically cast the corresponding view in your layout. Instead of slow reflection, code is generated to perform the view look-ups. Calling bind delegates to this generated code that you can see and debug.

Butterknife - Bind Android views and callbacks to fields and methods.

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Dagger 2 - Compile-time dependency injection framework for both Java and Android

Guice - Lightweight Dependency Injection Framework for Java

Dagger v1 - A fast dependency injector for Android and Java.

Butterknife - Bind Android views and callbacks to fields and methods.

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Projects

Dagger 2 - Compile-time dependency injection framework for both Java and Android

Guice - Lightweight Dependency Injection Framework for Java

Dagger v1 - A fast dependency injector for Android and Java.

Butterknife - Bind Android views and callbacks to fields and methods.

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