[英]How can we achieve Shared View Model communication between a Fragment and Activity, where the Activity is not the Parent
I am trying to achieve Fragment to Activity communication given that the Activity is not the parent Activity.鉴于 Activity 不是父 Activity,我正在尝试实现 Fragment 到 Activity 的通信。
So, I have a MainActivity
that has a fragment called ContactListFragment
, while the add button on the BottomNavigationView
of MainActivity
is clicked, I am opening another AddContactActivity
to add a contact.所以,我有一个
MainActivity
有一个名为ContactListFragment
的片段,当单击MainActivity
的BottomNavigationView
上的添加按钮时,我正在打开另一个AddContactActivity
来添加联系人。 My requirement is to when I am clicking the save button on the AddContactActivity
, I need to initiate a data-sync with server in ContactListFragment
.我的要求是当我单击
AddContactActivity
上的保存按钮时,我需要在ContactListFragment
中启动与服务器的数据同步。 I think the best approach would be to use a Shared View Model for this, but in that Case how should I create the view model so that the lifecycle owner doesn't get changed?我认为最好的方法是为此使用共享视图 Model,但在这种情况下,我应该如何创建视图 model 以便生命周期所有者不会改变?
I thought about using the Application Context
as the owner but I feel like its an overkill for a task like this, and it may produce some consequences down the line when other modules are added to the project.我考虑过使用
Application Context
作为所有者,但我觉得它对于这样的任务来说有点过头了,而且当其他模块添加到项目中时,它可能会产生一些后果。
So is there a way to efficiently implement this approach?那么有没有办法有效地实施这种方法? Thanks.
谢谢。
Write an interface class with object/objects/Data types you need to sync使用需要同步的对象/对象/数据类型编写接口 class
interface OnSaveClickListener {
fun onSaveClicked(contact: Contact)
}
Now in ContactListFragment class现在在 ContactListFragment class
class ContactListFragment : Fragment(), OnSaveClickListener {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
(activity as AddContactACtivity).mOnSaveClickListener = this
}
override fun onSaveClicked(contact: Contact) {
// Whatever you want to do with the data
}
}
In AddContactActivity,在 AddContactActivity 中,
class AddContactActivity {
var mOnSaveClickListener : OnSaveClickListener? = null
private void whenYouClickSave(contact: Contact){
mOnSaveClickListener?.onSaveClicked(contact)
}
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