public class BaseActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public void onStart() {
        super.onStart();
        EventBus.getDefault().register(this);
    }

    @Override
    public void onStop() {
        super.onStop();
        EventBus.getDefault().unregister(this);
    }
    //下面两个是订阅者方法
    @Subscribe(threadMode = ThreadMode.MAIN, sticky = true, priority = 100)
    public void onMessageEvent(MsgEvent event) {
        Toast.makeText(this, "BaseActivity"+event.getValue(), Toast.LENGTH_LONG).show();
    }

    @Subscribe(threadMode = ThreadMode.MAIN, sticky = true, priority = 101)
    public void onMessageEvent1(MsgEvent event) {
        Toast.makeText(this, "BaseActivity"+event.getValue()+"11111", Toast.LENGTH_LONG).show();
    }
}

public class MainActivity extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    //下面的两个订阅方法和父类的相同，也就是说对EB框架而言methodKey是相同的
    @Subscribe(threadMode = ThreadMode.MAIN, sticky = true, priority = 100)
    public void onMessageEvent(MsgEvent event) {
        Toast.makeText(this, event.getValue(), Toast.LENGTH_LONG).show();
    }

    @Subscribe(threadMode = ThreadMode.MAIN, sticky = true, priority = 101)
    public void onMessageEvent1(MsgEvent event) {
        Toast.makeText(this, event.getValue()+"11111", Toast.LENGTH_LONG).show();
    }

    /**
     * 发送事件
     * @param view
     */
    public void onSend(View view) {
        //构造事件消息，发送
        MsgEvent event = new MsgEvent("haha");
        EventBus.getDefault().post(event);
    }
}

 boolean checkAdd(Method method, Class<?> eventType) {
            // 2 level check: 1st level with event type only (fast), 2nd level with complete signature when required.
            // Usually a subscriber doesn't have methods listening to the same event type.
            Object existing = anyMethodByEventType.put(eventType, method);
            if (existing == null) {
                return true;
            } else {
                if (existing instanceof Method) {
                    if (!checkAddWithMethodSignature((Method) existing, eventType)) {
                        // Paranoia check
                       //《=========崩溃位置========》
                        throw new IllegalStateException();
                    }
                    // Put any non-Method object to "consume" the existing Method
                    anyMethodByEventType.put(eventType, this);
                }
                return checkAddWithMethodSignature(method, eventType);//位置1
            }
        }