如何将视图模型变量与自定义类类型绑定 [英] How to bind a view model variable with custom class type

问题描述

什么有效?

XML:

            name="viewModel"
            type="com. . . . .MyViewModel" />
...
...
...
<android.support.v7.widget.RecyclerView
            android:id="@+id/feeds_list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="center_horizontal"
            app:items="@{viewModel.feeds}"
            />

MyViewModel类:

MyViewModel class:

private String[] feeds;
...
...
public MyViewModel() {
    String[] feeds = new String[] {"foo", "bar"};
    setFeeds(feeds);
}

@Bindable
    public  String[]  getFeeds() {
        return feeds;
    }

    public void setFeeds( String[]  feeds) {
        this.feeds = feeds;
        notifyPropertyChanged(BR.feeds);
    }

MyActivity:

MyActivity:

    @BindingAdapter({"items"})
    public static void myMethod(View view, String[] feeds) {
        // Do somthing
    }

我要更改什么?

我想将String []更改为List<Feed>并且未达到myMethod.

I want to change String[] to List<Feed> and myMethod is not reached.

我的Feed类:

public class Feed {
    private String name;

    public Feed(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

目前，此类仅包含一个String成员，但是他当然将包含更多.

For now, this class contains only one String members, but of course he will contain more.

推荐答案

在viewmodel中像下面这样更改

Change this like below in viewmodel

   private MutableLiveData<List<Feed>> feedListLivedata =  new MutableLiveData<>();;



 public MyViewModel() {
    //create a list of feed here
    setFeeds(feeds);
}



public void setFeeds( List<Feed>  feeds) {
        feedListLivedata .postValue(feeds);
    }

//创建供稿列表实时数据的获取器和设置器.

//create getter and setter for feed list live data.

现在是xml

 app:items="@{viewModel.feedListLivedata }"

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