Factory Pattern Android

As we all know we have design pattern in programming languages. So Factory Pattern in one of them and it is widely used. I have used it in my app

It falls under Creational Design Pattern.

So lets start with Word Factory, factory is a place where something is created. So here Object is created, without having knowledge to client about logic.

We will go Step by Step.

In Factory Pattern we have 1 interface and some classes need to implement that interface .

interface MusicPlayer{
void Play()
}

Now i have 2 classes one is Audio Player and Other is Video Player .

class AudioPlayer implements MusicPlayer{
 @Override void Play()
}
class VideoPlayer implements MusicPlayer{
 @Override void Play()
}

Now Create a MusicPlayer Factory.

class MusicPlayerFactory {
public MusicPlayer musicPlayer(String type) {
if(type == null) {
return null;
}
if(type == "audio") {
return new AudioPlayer();
}
if(type == "video") {
return new VideoPlayer();
}
}
}

Now Access Audio and Video as below information.

class MusicService {
void getMusic() {
MusicFactory musicFactory = new MusciFactory();
Music music = musicFactory.musicPlayer("audio");
music.play();
}
}

So this is Factory Pattern, and you can how easy it is and its practical implementation in android app.

I have used this pattern in app : https://play.google.com/store/apps/details?id=com.mcmedia.kidslearningapp