LiveDataBus使用方式

调用方式

订阅消息

• observe 生命周期感知，不需要手动取消订阅

LiveDataBus.get()
    .with("key_name", String.class)
    .observe(this, new Observer() {
        @Override
        public void onChanged(@Nullable String s) {

        }
    });

• observeForever 需要手动取消订阅

LiveDataBus.get()
    .with("key_name", String.class)
    .observeForever(observer);

LiveDataBus.get()
    .with("key_name", String.class)
    .removeObserver(observer);

发送消息

• setValue 在主线程发送消息

LiveDataBus.get().with("key_name").setValue(value);

• postValue 在后台线程发送消息，订阅者会在主线程收到消息

LiveDataBus.get().with("key_name").postValue(value);

Sticky模式

支持在注册订阅者的时候设置Sticky模式，这样订阅者可以接收到订阅之前发送的消息

• observeSticky 生命周期感知，不需要手动取消订阅，Sticky模式

LiveDataBus.get()
        .with("sticky_key", String.class)
        .observeSticky(this, new Observer() {
            @Override
            public void onChanged(@Nullable String s) {

            }
        });

• observeStickyForever 需要手动取消订阅，Sticky模式

LiveDataBus.get()
        .with("sticky_key", String.class)
        .observeStickyForever(observer);
LiveDataBus.get()
        .with("sticky_key", String.class)
        .removeObserver(observer);

public final class LiveDataBus {

    private final Map> bus;

    private LiveDataBus() {
        bus = new HashMap<>();
    }

    private static class SingletonHolder {
        private static final LiveDataBus DEFAULT_BUS = new LiveDataBus();
    }

    public static LiveDataBus get() {
        return SingletonHolder.DEFAULT_BUS;
    }

    public synchronized  BusMutableLiveData with(String key, Class type) {
        if (!bus.containsKey(key)) {
            bus.put(key, new BusMutableLiveData<>());
        }
        return (BusMutableLiveData) bus.get(key);
    }

    public BusMutableLiveData