BaseFormModel.java

/**
 * A base class that provides a consistent interface for FormModel-like objects
 */
public abstract class BaseFormModel extends LinearLayout implements FormModel {

    protected Context mContext;

    public BaseFormModel(Context context) {
        super(context);
        setup(context);
    }

    public BaseFormModel(Context context, AttributeSet attrs) {
        super(context, attrs);
        setup(context);
    }

    private void setup(Context context) {
        mContext = context;

        LayoutInflater.from(context).inflate(getLayoutId(), this, true);
    }

    @Override
    public boolean validate() {
        return true;
    }

    /**
     * The layout resouce Id to be inflated
     */
    protected abstract int getLayoutId();

    protected String getString(int resourceId) {
        return getContext().getString(resourceId);
    }
}

FormModel.java

public interface FormModel {

    public boolean validate();

    public void persist(Bundle outState);

    public void restore(Bundle bundle);

}