MVVM体系结构中单击事件的位置 [英] Location of click event in MVVM architecture
本文介绍了MVVM体系结构中单击事件的位置的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试将MVVM与数据绑定一起使用.在哪里应该编写click事件(Viewmodel或Activity)
I'm trying to use MVVM with databinding .. Where should I write click event (Viewmodel Or Activity)
欢迎示例...
推荐答案
您可以在其中任一事件上编写点击事件.就个人而言,我的偏好取决于我想要实现的目标以及实现它所需要的目标.
You can write your click events on either. Personally, my preference depends on what I want to achieve and what I need to achieve it.
ViewModel中的点击事件
Click event in ViewModel
定义您的ViewModel.通过回调与您的活动进行交流.
Define your ViewModel. Communicate with your activity via a Callback.
public class MyViewModel extends ViewModel{
private MyCustomCallback callback;
...
public void doOnClick(MyCustomCallback mCallback){
boolean isSuccessful = doMyAction.execute();
if (isSuccessful){
mCallback.actionIsSuccessful();
} else {
mCallback.actionFailed();
}
}
...
public void setCallback(callback){
this.callback = callback;
}
public MyCustomCallback getCallback(){
return this.callback;
}
...
public interface MyCustomCallback{
void actionIsSuccessful();
void actionFailed();
}
}
在您的活动中实施此回调:
Implement this callback in your activity:
public class MyActivity extends AppCompatActivity{
...
private MyCustomCallback callback;
@Override
protected void onCreate(Bundle savedInstanceState){
...
callback = new MyViewModel.MyCustomCallback{
@Override
public void actionIsSuccessful(){
//do something when action is successful
}
@Override
public void actionFailed(){
//do something when action fails
}
}
viewModel.setCallback(callback);
}
}
将ViewModel作为变量传递给XML.然后执行以下操作:
Pass your ViewModel as a variable to your XML. Then do this:
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/button_background"
android:layout_margin="20dp"
tools:text="CLICK ME!!!"
android:textColor="@android:color/white"
android:onClick="@{() -> ViewModel.doOnClick(ViewModel.callback)}"/>
活动中的点击事件
Click events in Activity
public class MyActivity extends AppCompatActivity{
...
private MyCustomCallback callback;
@Override
protected void onCreate(Bundle savedInstanceState){
//initialize your binding
...
binding.setClickHandler(new MyActivityClickHandler());
}
public class MyActivityClickHandler{
public void onClickMeClicked(View view){
//do something
}
}
}
然后使用您的XML:
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/button_background"
android:layout_margin="20dp"
android:text="@string/verify"
android:textColor="@android:color/white"
android:onClick="@{ClickHandler::onClickMeClicked}"/>
有关更多信息,请在此处
这篇关于MVVM体系结构中单击事件的位置的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文