I am working on an Android app that displays a list of books that match a search term. I am using the Google Books API. From the API I get a list of the following items: title, author, publication date and URI for a small thumbnail to display.
I am able to display the information in the RecyclerView except the thumbnail. For that I am trying to use the Glide library. It always stays blank and if I use the placeholder option it always displays the placeholder. (I have added the dependencies in the Gradle file also).
implementation 'com.github.bumptech.glide:glide:4.11.0'
annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'
I have tried debugging and indeed the variable mThumbnail is not empty and has a valid address. Is this the correct way of using Glide for thumbnails?
I'll post below my layout for the RecyclerView item and adapter code also.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:paddingEnd="16dp"
android:paddingLeft="16dp"
android:paddingStart="16dp"
android:paddingRight="16dp"
android:orientation="horizontal">
<ImageView
android:id="@+id/book_thumbnail"
android:layout_width="100dp"
android:layout_height="150dp"
<!--app:layout_constraintDimensionRatio = "4:5.5"-->
/>
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical"
android:visibility="visible">
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:text="Le petit prince" />
<TextView
android:id="@+id/authors"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:text="Antoine-Saint Exupery" />
<TextView
android:id="@+id/publishedDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:text="1943" />
</LinearLayout>
</LinearLayout>
And the adapter code:
package com.example.booksearch;
import android.content.Context;
import android.graphics.Bitmap;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.Glide;
import com.bumptech.glide.request.RequestOptions;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
/**
* Adapter used for RecyclerView
*/
public class BookListAdapter extends RecyclerView.Adapter<BookListAdapter.BookViewHolder>{
private LayoutInflater mInflater;
private final List<Book> mBookList;
Context context;
/**
* BookListAdapter constructor.
* @param context Takes context of applications
* @param bookList A list of books.
*/
public BookListAdapter(Context context, ArrayList<Book> bookList){
mInflater = LayoutInflater.from(context);
this.mBookList = bookList;
this.context = context;
}
/**
* Empties adapter.
*/
public void clear(){
mBookList.clear();
}
/**
* Adds all books to adapter.
* @param books List of books to add.
*/
public void addAll(ArrayList<Book> books){
mBookList.addAll(books);
}
/**
* Used on creating of BookViewHolder
* @param parent BookViewHolder
* @param viewType
* @return A BookViewHolder object
*/
@NonNull
@Override
public BookViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View mItemView = mInflater.inflate(R.layout.book_item,parent, false);
return new BookViewHolder(mItemView, this);
}
/**
* Binds (sets content of ViewHolder)
* @param holder Holder to work on
* @param position Position of the book that belongs to the ViewHolder
*/
@Override
public void onBindViewHolder(@NonNull BookListAdapter.BookViewHolder holder, int position) {
String mTitle = mBookList.get(position).getTitle();
String mAuthor = mBookList.get(position).getAuthor();
String mPublishedDate = mBookList.get(position).getPublishedYear();
Uri mThumbnailUri = mBookList.get(position).getThumbnailUri();
holder.titleView.setText(mTitle);
holder.authorView.setText(mAuthor);
holder.publishedYearView.setText(mPublishedDate);
if (!mThumbnailUri.toString().isEmpty()){
Glide.with(context)
.load(mThumbnailUri.toString())
.override(100,200)
//.placeholder(R.drawable.ic_baseline_book_24)
.into(holder.thumbnailView);
} else {
Glide.with(context)
.load(R.drawable.ic_baseline_book_24)
.into(holder.thumbnailView);
holder.thumbnailView.setImageAlpha(50);
}
}
/**
* Returns size of book list.
* @return An integer with size of the list.
*/
@Override
public int getItemCount() {
return mBookList.size();
}
/**
* Inner class of BookListAdapter, for ViewHolder of book object.
*/
class BookViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public final TextView titleView;
public final TextView authorView;
public final TextView publishedYearView;
public final ImageView thumbnailView;
final BookListAdapter mAdapter;
/**
* Constructor of BookViewHolder object.
* @param itemView The itemView for one book object.
* @param adapter The adapter that is used for book objects.
*/
public BookViewHolder(View itemView, BookListAdapter adapter){
super(itemView);
titleView = itemView.findViewById(R.id.title);
authorView = itemView.findViewById(R.id.authors);
publishedYearView = itemView.findViewById(R.id.publishedDate);
thumbnailView = itemView.findViewById(R.id.book_thumbnail);
//thumbnailView.setScaleType(ImageView.ScaleType.CENTER);
this.mAdapter = adapter;
itemView.setOnClickListener(this);
}
@Override
public void onClick(View v) {
}
}
}
