点击事件在MVVM架构中的位置

Question

我正在尝试将 MVVM 与数据绑定一起使用。我应该在哪里编写点击事件（Viewmodel 或 Activity）

欢迎提供示例...

Answer 1

您可以在任何一个上编写您的点击事件。就我个人而言，我的偏好取决于我想要实现的目标以及实现目标所需的目标。

Click event in ViewModel

定义您的 ViewModel。通过回调与您的 activity 沟通。

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 activity 中实现此回调：

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);
    }
}

将您的 ViewModel 作为变量传递给您的 XML。然后这样做：

<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)}"/>

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
        }
    }
}

然后在你的 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}"/>

更多信息查看官方文档here

点击事件在MVVM架构中的位置

Location of click event in MVVM architecture

android

mvvm

data-binding

android-databinding