Typedef Annotations example

MusicNameType.java

@StringDef({
    POP,
    ROCK,
    JAZZ
})
@Retention(RetentionPolicy.SOURCE)
public @interface MusicNameType {}

ActionBar.java

public abstract class ActionBar {

    // Define the list of accepted constants and declare the NavigationMode annotation
    @Retention(RetentionPolicy.SOURCE)
    @IntDef({NAVIGATION_MODE_STANDARD, NAVIGATION_MODE_LIST, NAVIGATION_MODE_TABS})
    public @interface NavigationMode {
    }

    // Declare the constants
    public static final int NAVIGATION_MODE_STANDARD = 0;
    public static final int NAVIGATION_MODE_LIST = 1;
    public static final int NAVIGATION_MODE_TABS = 2;

    // Decorate the target methods with the annotation
    @NavigationMode
    public abstract int getNavigationMode();

    // Attach the annotation
    public abstract void setNavigationMode(@NavigationMode int mode);
}

MainActivity.java

public class MainActivity extends AppCompatActivity implements Rocker, RockerNames {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        letsRock(Rocker.POP);
        letsRockName(RockerNames.POP);
        
        MyActionBar myActionBar = new MyActionBar();
        myActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    }

    @Override
    public void letsRock(@MusicType int musicType) {

    }

    @Override
    public void letsRockName(@MusicNameType String musicNameType) {

    }
}

MusicType.java

@IntDef({
    POP,
    ROCK,
    JAZZ
})
@Retention(RetentionPolicy.SOURCE)
public @interface MusicType {}

MyActionBar.java

public class MyActionBar extends ActionBar {

    @NavigationMode
    private int mode;

    @Override
    public int getNavigationMode() {
        return ActionBar.NAVIGATION_MODE_STANDARD;
    }

    @Override
    public void setNavigationMode(@NavigationMode int mode) {
        this.mode = mode;
    }
}

Rocker.java

public interface Rocker {

    public static final int POP = 0;
    public static final int ROCK = 1;
    public static final int JAZZ = 2;

    void letsRock(@MusicType int musicType);
}

RockerNames.java

public interface RockerNames {

    public static final String POP = "POP";
    public static final String ROCK = "ROCK";
    public static final String JAZZ = "JAZZ";

    void letsRockName(@MusicNameType String musicNameType);
}

sources.txt

https://developer.android.com/studio/write/annotations.html?hl=en#enum-annotations
https://gist.github.com/jmarkovic/95c2ad6caddf3c414783
https://www.youtube.com/watch?v=Hzs6OBcvNQE
https://infinum.co/the-capsized-eight/magic-constants-in-android-development
https://guides.codepath.com/android/Replacing-Enums-with-Enumerated-Annotations
https://noobcoderblog.wordpress.com/2015/04/12/java-enum-and-android-intdefstringdef-annotation/