android - RecyclerView 适配器没有膨胀 xml 布局

Question

我有一组图像链接，我将它们存储在一个数组列表中，并将其传递给适配器的构造函数以进行进一步处理。

我想使用 Picasso 在 RecyclerView 中显示图像。

But when I run my app the Toast message appears "Successfully Downloaded", but no image view shown on my UI(snapshot is shown below).

下面是我的适配器

public class ImageViewAdapter extends RecyclerView.Adapter<ImageViewAdapter.MyViewHolder> {

ArrayList<MovieDetials> dataList;
Context c;
public ImageViewAdapter(ArrayList<MovieDetials> list, Context context){
    dataList = list;
    c = context;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(c).inflate(R.layout.imagelayout,parent,false);
    MyViewHolder myViewHolder = new MyViewHolder(view);
    return myViewHolder;
}

@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
    Picasso.with(c).load("https://image.tmdb.org/t/p/w500"+dataList.get(position).getPoster()).into(holder.imageView, new Callback() {
        @Override
        public void onSuccess() {
            Toast.makeText(c, "Successfully Downloded", Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onError() {

        }
    });
}

@Override
public int getItemCount() {
    return dataList.size();
}

public class MyViewHolder extends RecyclerView.ViewHolder {
    ImageView imageView;
    public MyViewHolder(View itemView) {
        super(itemView);
        imageView = (ImageView)itemView.findViewById(R.id.imageView);
    }
}

}

imagelayout.xml 在下面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<ImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/imageView"
    android:contentDescription="An image"/>

</LinearLayout>

我正在使用网格布局管理器查看图像(下面是代码)

adapter = new ImageViewAdapter(data,this);
recyclerView.setLayoutManager(new GridLayoutManager(this,2));
recyclerView.setAdapter(adapter);

Answer 1

将 RecyclerView 高度更改为 match_parent

<android.support.v7.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    ...
    />