gistfile1.txt

//static way (dont want to do this)

public class SlideshowActivity extends Activity{
  public static void start(ArrayList<String> images, Song song, Uri videoUri, Context ctx){
    Intent intent = new Intent(ctx, SlideshowActivity.class);
    intent.putExtra(EXTRA_IMAGE_FILE_NAMES, images);
    intent.putExtra(EXTRA_SELECTED_SONG, song);
    intent.putExtra(EXTRA_VIDEO_URI, videoUri);
    ctx.startActivity(intent);
  }
...
}

// plain factory:

public class IntentFactory{
   @Inject
   private Context

   public void startActvity1(ArrayList<String> images, Song song, Uri videoUri){
    context.startActivity(buildIntent(images,song,videoUri);
   }

   public Intent buildIntent(ArrayList<String> images, Song song, Uri videoUri){
    Intent intent = new Intent(ctx, SlideshowActivity.class);
    intent.putExtra(EXTRA_IMAGE_FILE_NAMES, images);
    intent.putExtra(EXTRA_SELECTED_SONG, song);
    intent.putExtra(EXTRA_VIDEO_URI, videoUri);
    return intent;
   }

   ... (Othter Activies/Services/ etc
}

//  factory with parameters:

public class InjectionFactory {
    
    private Context context;
    
    @Inject
    public InjectionFactory(Context context){
        this.context = context;
    }
    
//IntentFactoryParameters is an interface
    public void start(IntentFactoryParameters parameters){
        Intent intent = buildIntent(parameters);

        parameters.start(context, intent);

    }

    public Intent buildIntent(IntentFactoryParameters parameters){
        android.content.Intent intent = new android.content.Intent(context, parameters.getTargetContext());

        for (Map.Entry<String, Object> extraEntry : parameters.getExtraMap().entrySet()) {
            intent.putExtra(extraEntry.getKey(), extraEntry.getValue());
        }

        return intent;
    }
}


public interface IntentFactoryParameters {

    void start(Context context, Intent intent);

    Class<? extends Context> getTargetContext();
    
    Map<String, Object> getExtraMap();
}


//implementation

public class Activity1FactoryParameters implmemetns IntentFactoryParameters {

    public void start(Context context, Intent intent){
// same as above, essentially
}

    public Class<? extends Context> getTargetContext(){
return Activity1.class;
}
    
    public Map<String, Object> getExtraMap(){
//return built extra map
}
}

//usage:

@Inject
InjectionFactory injectionFactory;
...

injectionFactory.start(new Activity1FactoryParameters(images, song, videoUri));