Dependency injection
Dependency injection is a software design pattern that implements inversion of control and allows a program design to follow the dependency inversion principle. The term was coined by Martin Fowler - Wikipedia
Why Dependency injection?
- Reduction of boilerplate code
- It promotes reusability, testability and maintainability.
There is any DI for Android?
Yes, there are many libraries which support injection in android. Listed below are used the most in this space.
- RoboGuice
- Android Annotations
- Dragger
- ButterKnife
- Transfuse
Which is the best Dependency Injection Framework?
It’s purely depending on the usage of your project.
For Example:
In android, if I want to avoid the boilerplate code such as injection of views, view holder in adapter and click listeners then the preferred library can be ButterKnife compare to others because remaining all done more than the required. There are tons of features which are not used added in all these libraries.
AndroidAnnotations and ButterKnife does the similar work. RoboGuice, Dagger and Transfuse are in the same category.
We will take one from each, say RoboGuice vs ButterKnife.
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RoboGuice
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ButterKnife
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Minimum Jars required
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3 (roboguice-2.0.jar, javax.inject-1.jar and guice-3.0-no_aop.jar)
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1 (butterknife-4.0.1.jar)
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Should replace Activity?
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Yes, Replace Activity with RoboActivity
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No Need
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Can be used?
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Yes, By adding one more jar (roboguice-sherlock-1.5) to the application and we should replace SherlockActivity to RoboSherlockActivity
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Yes, No need of extra jars
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Injection for Click Listeners
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No
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Yes
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Performance
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There is performance impact as it's done on runtime using reflection
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Compile time
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Pojo Injection
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Yes
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No
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injection in Fragments
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Yes
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Yes
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Injection in Adapters
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No
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Yes
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Code License
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Origin
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Note: Managing Your App's Memory from developer.android
Avoid dependency injection frameworks
Using a dependency injection framework such as Guice or RoboGuice may be attractive because they can simplify the code you write and provide an adaptive environment that's useful for testing and other configuration changes.
Be careful about using external libraries
External library code is often not written for mobile environments and can be inefficient when used for work on a mobile client.
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