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Am I doing dependency injection in activity code correctly?


Am I doing dependency injection in activity code correctly?

By : user2173089
Date : October 21 2020, 08:10 PM
seems to work fine You are right, your change does not make much of a difference and is not injecting the dependency. Since your SplashActivity object is responsible for creating the fragments, they are still dependent on the SplashActivity object.
If you want to use dependency injection, you would have to create the fragment objects somewhere outside the SplashActivity and then pass them into the object.
code :
MainFragment fragment;
if(splash){ fragment = new SplashFragment(); }
if(login){fragment = new LoginFragment(); }

// Pass fragment variable into splash activity
SplashActivity activty = new SplashActivity(fragment);

public class SplashActivity{
    MainFragment mFragment;

    public SplashActivty(MainFragment fragment){
        mFragment = fragment;
    }
}


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PHP dependency injection. Is my code here actually dependency injection container?

PHP dependency injection. Is my code here actually dependency injection container?


By : Zach Lees
Date : March 29 2020, 07:55 AM
this one helps. To me this looks like a collection of methods to instantiate objects needed by the specific API. I don't know that I would consider it dependency injection in and of itself. It is hard to tell though without seeing how this class is actually used. To me, a dependency injection container would basically containe metadata about how to instantiate various classes that implement a common interface.
So a sample set of classes that might interact to achieve dependency injection might look like:
code :
class db_dependency_provider {
    private static $class_map = array(
        'postgres' => 'postgres_abstraction_class',
        'mysql' => 'mysql_abstraction_class',
        'oracle' => 'oracle_abstraction_class'
    }

    public static function get_db_abstraction($type) {
        $class = self::$class_map[$type];
        return new $class();
    }
}

interface db_abstraction_interface {
    public function connect();
    public function query($query);
    // etc.
}

class mysql_db_abstraction implements db_abstraction_interface {
    // actual implementation
}

class postgres_db_abstraction implements db_abstraction_interface {
    // actual implementation
}

class some_class_that_needs_a_db {
    $db = null;
    public function __construct($db) {
        $this->db = $db;
    }
    // other methods
}

// use dependency injection container
$class = new some_class_that_needs_a_db(db_dependency_provider::get_db_abstraction('mysql'));
Dependency Injection - Have I refactored the code correctly?

Dependency Injection - Have I refactored the code correctly?


By : Jackman
Date : March 29 2020, 07:55 AM
around this issue I'm attempting this question in preparation for a test. This is my best answer based on my understanding but I feel I may be missing something important. I think I have altered the responsibility of Navigator too much but I can't see a better way of doing it. , Could be better.
code :
public class Navigator {

  private final Route theRoute;
  private final MapView theMap;

  public Navigator(Route inRoute, MapView theMap) {
    theRoute = inRoute;
    this.theMap = theMap;
  }

  public void setup() {
    theRoute.calculateRoute();
  }

  public void display() {
    theMap.plot(theRoute);
  }

}
Is it OK for code that gets a dependency by dependency injection to use a default implementation of the dependency unles

Is it OK for code that gets a dependency by dependency injection to use a default implementation of the dependency unles


By : sung.ori
Date : March 29 2020, 07:55 AM
will help you No, having callers depend on concrete implementations of dependencies is not the best way to do dependency injection. Component implementations should always depend only on component interfaces, not on other component implementations.
If one implementation depends on another,
Dependency injection in non-global activity scope done right. How to provide special MyActivity as Activity

Dependency injection in non-global activity scope done right. How to provide special MyActivity as Activity


By : Ygames1
Date : March 29 2020, 07:55 AM
help you fix your problem
Now the LoginActivityModule and MainActivityModule look very similar. Is there a better approach to provide SomeManager to both activities without making them @Singleton? I had something in mind like that it only takes an Activity instead of a specific XXXActivity.
code :
@Module
object SomeManagerModule {

    @JvmStatic
    @Provides
    @ActivityScoped
    internal fun provideSomeManager(activity: Activity, apiClient: ApiClient) =
            SomeManager(activity, apiClient)
}
@Module(includes = [SomeManagerModule::class])
object MainActivityModule { /* ... */ }

// or

@ActivityScoped
@ContributesAndroidInjector(modules = [LoginActivityModule::class, SomeManagerModule::class])
internal abstract fun loginActivity(): LoginActivity
@ActivityScoped
SomeManager @Inject constructor(activity: Activity, apiClient: ApiClient)
Correctly use dependency injection

Correctly use dependency injection


By : user3861814
Date : November 21 2020, 07:01 PM
around this issue As a general rule, it's more object-oriented to pass around objects that encapsulate concepts than passing around strings. That said, there are many cases (particularly when it comes to UI) when you need to translate sparse data (such as strings) to proper Domain Objects.
As an example, you need to translate user input in form of a string into an ISoda instance.
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