Android请问接口方法在哪个线程中调用？ 同步还是异步？

Question

I know it is a very question. I am trying to implement a callback mechanism.

I have a java Class in Android and inside i have an interface

public interface MyInterface {

        public void cb1(Integer id);
        public void cb2(Integer id);
    };

User can use my Interface and implement, and whenever i need to inform to the user , i will invoke cb1() or cb2().

Question:

Let's say user have provided me implementation of interface mInterface,

 while (1) {
     mInterface.cb1()
 }

1) In which thread cb1() will get invoked ? sync call or async call ?

2) if async call, what if the implementation of cb1() blocks for some time? Will all the cb1() calls delivered to the user one by one ?

Answer 1

In the code above it will be a synchronous call. If you want it to be async, you should create a new Thread to perform the callback on.

Answer 2

Odd question. The code will be async relative to the main thread if it is not executed on the main thread. Otherwise it will be sync and is executed on the main thread