android - 使用Android数据绑定(bind)时，如何访问BindingAdapter内部的实例变量？

因此，我使用此流行的数据绑定(bind)代码段通过传入URL将图像加载到列表项的imageview中:

  <ImageView
        android:layout_width="match_parent"
        android:layout_height="150dp""
        app:imageUrl="@{movie.imageUrl}"
        />

绑定(bind)适配器:

class Movie{
    boolean isLoaded;

    @BindingAdapter({"bind:imageUrl"})
        public static void loadImage(final ImageView view, String imageUrl) {

            Picasso.with(view.getContext())
                .load(imageUrl)
                .into(view, new Callback.EmptyCallback() {
                @Override public void onSuccess() {
                    //set isLoaded to true for the listview item
                    // but cannot access boolean isLoaded as it is non static.
                });
    }

如果我只是简单地将BindingAdapter设为非静态，那么它将引发错误:

java.lang.IllegalStateException: Required DataBindingComponent is null     in class MovieTileBinding. A BindingAdapter in     com.example.moviesapp.Pojos.Results is not static and requires an object to     use, retrieved from the DataBindingComponent. If you don't use an inflation method taking a DataBindingComponent, use DataBindingUtil.setDefaultComponent or make all BindingAdapter methods static.

最佳答案

通过自定义绑定(bind)适配器放置整个影片实例:

 <ImageView
        android:layout_width="match_parent"
        android:layout_height="150dp""
        app:movie="@{movie}"
        />

绑定(bind)适配器:

class Movie{
boolean isLoaded;

@BindingAdapter({"movie"})
    public static void loadImage(final ImageView view, final Movie movie) {
        if(movie != null && moview.getImageUrl() != null){
          Picasso.with(view.getContext())
             .load(movie.getImageUrl())
             .into(view, new Callback.EmptyCallback() {
             @Override public void onSuccess() {
                 image.setLoaded(true);
             });
     }
}