public void removeAll() {
    SharedPreferences.Editor editor = getSharedPreferences().edit();
    editor.remove("default_id");
    editor.remove("default_name");
    editor.remove("default_enabled");
    editor.commit();
  }

  public boolean isEmpty() {
    SharedPreferences sharedPreferences = getSharedPreferences();
    return !sharedPreferences.contains("default_id") && !sharedPreferences.contains("default_name") && !sharedPreferences.contains("default_enabled") ;}
  

      
@SharedPreference(name = "default")
public final class DefaultEntity {

	@PreferenceKey("id") private final int id;
	@PreferenceKey("name") @NonNull private final String name;
	@PreferenceKey("enabled") private final boolean enabled;

	public DefaultEntity(int id, @NonNull String name, boolean enabled) {
		this.id = id;
		this.name = name;
		this.enabled = enabled;
	}

	@Override
	public String toString() {
		return "DefaultEntity{" + "id=" + id + ", name='" + name + '\'' + ", enabled=" + enabled + '}';
	}

	public int getId() {
		return id;
	}

	@NonNull
	public String getName() {
		return name;
	}

	public boolean isEnabled() {
		return enabled;
	}
}

      AppPreferences appPreferences = new AppPreferences(context);
      DefaultPreferences defaultPreferences = appPreferences.getDefaultPreferences();
      // Returns immutable entity with values
      DefaultEntity defaultEntity = defaultPreferences.getDefaultEntity();
      
      int id = defaultPreferences.getId();
      int id2 = defaultPreferences.getId(-1);
      
      defaultPreferences.putId(1);
      defaultPreferences.removeId();
      defaultPreferences.containsId();
      
      // Remove all
      defaultPreferences.removeAll();