我用的是网上大哥的SingleLiveEvent,完美解决，附源码
public class SingleLiveEventextends MutableLiveData {
private final AtomicBooleanmPending =new AtomicBoolean(false);
@Override
public void observe(@NonNull LifecycleOwner owner, @NonNull final Observer observer) {
super.observe(owner, new Observer() {
@Override
public void onChanged(@Nullable T t) {
if (mPending.compareAndSet(true, false)) {
observer.onChanged(t);
}
}
});
}
@MainThread
public void setValue(@Nullable T t) {
mPending.set(true);
super.setValue(t);
}
/**
* Used for cases where T is Void, to make calls cleaner.
*/
@MainThread
public void call() {
setValue(null);
}
