How to load an image from memory into RecyclerView?

Question

I try using Picasso to load a file from the internal memory by uri. All the time it crashes, it gives a java.lang.ClassCastException error: android.widget.LinearLayout please find a mistake

import android.net.Uri; import android.support.v7.widget.CardView; import android.support.v7.widget.RecyclerView; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import java.util.List; import it.sephiroth.android.library.picasso.Picasso; public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> { private static final String LOG_TAG = "my_log"; List<Cover> covers; RecyclerAdapter(List<Cover> covers) { this.covers = covers; } @Override public void onAttachedToRecyclerView(RecyclerView recyclerView){ super.onAttachedToRecyclerView(recyclerView); } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int i) { View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card, parent, false); ViewHolder vh = new ViewHolder(v); return vh; } @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { Cover cover = covers.get(position); String filePath = String.valueOf(cover.getFileBookCover()); Log.d(LOG_TAG, "Cover URI URI: " + filePath); Uri uri = cover.getFileBookCover(); Picasso .with(holder.itemView.getContext()) .load(uri) .into((ImageView) holder.itemView); } @Override public int getItemCount() { return covers.size(); } public static class ViewHolder extends RecyclerView.ViewHolder { CardView cardView; ImageView imgObl; ViewHolder (View itemView) { super(itemView); cardView = itemView.findViewById(R.id.card_view); imgObl = itemView.findViewById(R.id.iv_recycler_item); } } }

Accepted Answer · 2017-11-06T18:18:51

.into((ImageView) holder.itemView); - a mistake here. need to write .into(holder.imgObl)

You throw a picasso the root of the holder, the caller ID is not an ImageView

And it’s better to make a bind() public method in the holder. Pass the uri and let Picasso call it in this method. and on the adapter in the onBindViewHolder method call holder.bind(uri)

 public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ImageViewHolder> { private static final String LOG_TAG = "my_log"; List<Cover> covers; RecyclerAdapter(List<Cover> covers) { this.covers = covers; } @Override public void onAttachedToRecyclerView(RecyclerView recyclerView){ super.onAttachedToRecyclerView(recyclerView); } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int i) { View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.card, parent, false); ViewHolder vh = new ViewHolder(v); return vh; } @Override public void onBindViewHolder(ImageViewHolder holder, int position) { Cover cover = covers.get(position); String filePath = String.valueOf(cover.getFileBookCover()); Log.d(LOG_TAG, "Cover URI URI: " + filePath); Uri uri = cover.getFileBookCover(); holder.bind(uri); } @Override public int getItemCount() { return covers.size(); } public static class ImageViewHolder extends RecyclerView.ViewHolder { private CardView cardView; private ImageView imgObl; ViewHolder (View itemView) { super(itemView); cardView = itemView.findViewById(R.id.card_view); imgObl = itemView.findViewById(R.id.iv_recycler_item); } public void bind(Uri uri) { Picasso .with(itemView.getContext()) .load(uri) .into(imgObl); } }

}

Of course, it swears, you type in OnBindViewHolder, not with your ViewHolder class, but with the base one from the recycler.
and in general, your classes should not be called the same as basic ones.

How to load an image from memory into RecyclerView?

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