EventBus封装

EventBus封装使用

封装

implementation 'org.greenrobot:eventbus:3.2.0'

import org.greenrobot.eventbus.EventBus;
import xxx.entity.Event;

/**
 * EventBus的工具类
 */
public class EventBusUtil {
    
    public static void register(Object subscriber) {
        EventBus.getDefault().register(subscriber);
    }

    public static void unregister(Object subscriber) {
        EventBus.getDefault().unregister(subscriber);
    }

    public static void sendEvent(Event event) {
        EventBus.getDefault().post(event);
    }
    
    public static void sendStickyEvent(Event event) {
        EventBus.getDefault().postSticky(event);
    }

    // 其他
}

public class Event<T> {
    private int code;
    private T data;

    public Event(int code) {
        this.code = code;
    }

    public Event(int code, T data) {
        this.code = code;
        this.data = data;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
}

BaseActivity/BaseFragment中

import android.os.Bundle;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import xxx.entity.Event;

import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;

public class BaseActivity extends AppCompatActivity {
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        if (isRegisterEventBus()){
            EventBus.getDefault().register(this);
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (isRegisterEventBus()){
            EventBus.getDefault().unregister(this);
        }
    }



    //*******************************EventBus************************************
    /**
     * 是否注册事件分发
     * @return true绑定EventBus事件分发，默认不绑定，子类需要绑定的话复写此方法返回true
     */
    protected boolean isRegisterEventBus(){
        return false;
    }

    @Subscribe(threadMode = ThreadMode.MAIN)
    public void onEventBusCome(Event event) {
        if (event != null) {
            receiveEvent(event);
        }
    }

    @Subscribe(threadMode = ThreadMode.MAIN, sticky = true)
    public void onStickyEventBusCome(Event event) {
        if (event != null) {
            receiveStickyEvent(event);
        }
    }

    /**
     * 接收到分发到事件
     * 子类需要EventBus的话需要重写这个类
     *
     * @param event 事件
     */
    protected void receiveEvent(Event event) {

    }

    /**
     * 接受到分发的粘性事件
     *
     * @param event 粘性事件
     */
    protected void receiveStickyEvent(Event event) {

    }
    //*******************************EventBus************************************


}

使用

//可选
/**
 * 定义Event的code
 */
public final class C {
    // EventBus Code
    public static final class EventCode {
        public static final int A = 0x111111;
        public static final int B = 0x222222;
        public static final int C = 0x333333;
        public static final int D = 0x444444;
        // other more
    }
}

import android.os.Bundle;

import androidx.annotation.Nullable;

import xxx.entity.Event;
import xxx.entity.User;

public class MainActivity extends BaseActivity{
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.xxx);

        //在需要的地方发送事件(别的类中)
        //其中的code和data替换成自己的
        /*EventBusUtil.sendEvent(new Event(C.EventCode.A));

        EventBusUtil.sendEvent(new Event(C.EventCode.B));

        Event<User> event = new Event<>(C.EventCode.C, new User());
        EventBusUtil.sendEvent(event);

        Event<News> event = new Event<>(C.EventCode.D, new News());
        EventBusUtil.sendEvent(event);*/
    }

    @Override
    protected boolean isRegisterEventBus() {
        return true;
    }

    @Override
    protected void receiveEvent(Event event) {
        // 接受到Event后的相关逻辑
        switch (event.getCode()) {
            case C.EventCode.A:
                Log.d("EventBus", "接收到A类型的Event");
                break;
            case C.EventCode.B:
                Log.d("EventBus", "接收到B类型的Event");
                break;
            case C.EventCode.C:
                Log.d("EventBus", "接收到B类型的Event，携带User");
                User user = (User) event.getData();
                break;
            case C.EventCode.D:
                Log.d("EventBus", "接收到D类型的Event，携带News");
                News news = (News) event.getData();
                break;
        }
    }
}