在ViewModel中使用LiveData将对象传递给其他活动

private MutableLiveData<User> userLiveData = new MutableLiveData<>();

public void setUser(User user) {
    userLiveData.setValue(user);
}

public LiveData<User> getUserLiveData() {
    return userLiveData;
}

ViewModelProvider viewModelProvider = new ViewModelProvider(this);
MyViewModel myViewModel = viewModelProvider.get(MyViewModel.class);

User user = new User("John", 25);
myViewModel.setUser(user);

ViewModelProvider viewModelProvider = new ViewModelProvider(this);
MyViewModel myViewModel = viewModelProvider.get(MyViewModel.class);

myViewModel.getUserLiveData().observe(this, new Observer<User>() {
    @Override
    public void onChanged(User user) {
        // 在这里处理接收到的User对象
    }
});