An example for booking movie seat, combined of Android Data Binding, State Design Pattern and Multibinding + Autofactory. iOS version is: https://github.com/lizhiquan/MovieBooking
This is a simple example for booking movie seats in general movie/film mobile application. The concept is simply combined of State Design Pattern
, Android Data Binding
and Multibinding + Autofactory
below.
In the future, we can extend this concept by using RxJava
to handle behavior in only a stream, also chain any stream to process our logic.
Hope it will be useful for anyone who are building this context.
A seat has many states, such as:
To manage these states, we use State Design Pattern, also for the definition of state action, current state and switching between different states.
available seat
can be select to be a selected seat
, its state changes from AVAILABLE
to SELECTED
.selected seat
can be deselected to be an available seat
, its state changes from SELECTED
to AVAILABLE
For any state changes, we update the UI of the seat correspondingly by using @BindingAdapter
and @Bindable
annotations defined in Android Data Binding. Example:
app:state="@{data.state}"
.@Bindable State mState;
and must have getter public State getState() { return mState; }
.mState = new NewState();
then notifyPropertyChanged(BR.state);
, noted that BR.state
is generated after building our application.For the Dependency Injection, we use Dagger2 to setup. Dagger2 also supports Multibinding, it means that we can inject any ViewHolder
into our adapter to render the corresponding layout of an item in a list.
By using Autofactory, we construct some ViewHolders and provide these factory in a module. These factory must go with a key defined by @IntKey
, which is an item view type. Example:
@Provides
@IntoMap
@IntKey(Seat.Type.AVAILABLE)
SeatViewHolderFactory provideAvailableSeatViewHolder() {
return new AvailableSeatViewHolderFactory();
}
public interface SeatViewHolderFactory {
SeatViewHolder createViewHolder(ViewDataBinding binding);
}
@Override
public SeatViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
ItemSeatBinding binding = DataBindingUtil.inflate(LayoutInflater.from(parent.getContext()), R.layout.item_seat, parent, false);
return mSeatViewHolderFactoryMap.get(viewType).createViewHolder(binding);
}
MIT License
Copyright (c) 2017 Lam Tran ([email protected])
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in the Software without restriction, including without limitation the rights
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SOFTWARE.