ImageLoader implementation for my own fork of the Cast Companion Library using the Picasso library. See: https://github.com/cbeyls/CastCompanionLibrary-android

PicassoImageLoader.java

package com.google.sample.castcompanionlibrary.cast.imageloader;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.util.DisplayMetrics;

import com.squareup.picasso.Picasso;
import com.squareup.picasso.Target;

/**
 * ImageLoader implementation for the Cast Companion Library using the Picasso library.
 *
 * @author Christophe Beyls
 */
public class PicassoImageLoader implements ImageLoader {

	private final int mMaxImageSize;
	private final Picasso mPicasso;

	private static class PicassoRequest implements Target, ImageLoader.Request {

		private final String mUrl;
		private final Callbacks mCallbacks;

		public PicassoRequest(String url, Callbacks callbacks) {
			mUrl = url;
			mCallbacks = callbacks;
		}

		@Override
		public void onPrepareLoad(Drawable placeHolderDrawable) {
		}

		@Override
		public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
			mCallbacks.onResponse(bitmap);
		}

		@Override
		public void onBitmapFailed(Drawable errorDrawable) {
			mCallbacks.onResponse(null);
		}

		@Override
		public String getUrl() {
			return mUrl;
		}
	}

	public PicassoImageLoader(Context context, Picasso picasso) {
		// Use the device primary screen dimensions as max image size
		DisplayMetrics metrics = context.getResources().getDisplayMetrics();
		mMaxImageSize = Math.max(metrics.widthPixels, metrics.heightPixels);
		mPicasso = picasso;
	}

	@Override
	public Request load(String url, Callbacks callbacks) {
		PicassoRequest picassoRequest = new PicassoRequest(url, callbacks);
		mPicasso.load(url)
				.resize(mMaxImageSize, mMaxImageSize)
				.centerInside()
				.onlyScaleDown()
				.into(picassoRequest);
		return picassoRequest;
	}

	@Override
	public void cancelRequest(Request request) {
		mPicasso.cancelRequest((Target) request);
	}
}