Piccasso with Image Caching

adapter.java

@Override
    public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {

Picasso.with(holder.img.getContext())
                    .load("file address on web")
                    .into(holder.img, new com.squareup.picasso.Callback() {
                        @Override
                        public void onSuccess() {
                            BitmapDrawable btmpDr = (BitmapDrawable) holder.img.getDrawable();
                            Bitmap bmp = btmpDr.getBitmap();
                            ImageSaveTask task = new ImageSaveTask();
                            task.path = "file adress on memory";
                            task.execute(bmp);
                        }

                        @Override
                        public void onError() {
                        }
                    });
	}

ImageSaveTask.Java

package ir.technopedia.tbzmed.helper;

import android.graphics.Bitmap;
import android.os.AsyncTask;

/**
 * Created by user1 on 12/16/2016.
 */

public class ImageSaveTask extends AsyncTask<Bitmap, Void, Void> {
    public String path;
    @Override
    protected Void doInBackground(Bitmap... voids) {
if (voids[0] != null) {
            try {
                FileOutputStream outputStream = null;
                try {
                    outputStream = new FileOutputStream(path); //here is set your file path where you want to save or also here you can set file object directly

                    voids[0].compress(Bitmap.CompressFormat.PNG, 100, outputStream); // bitmap is your Bitmap instance, if you want to compress it you can compress reduce percentage
                    // PNG is a lossless format, the compression factor (100) is ignored
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    try {
                        if (outputStream != null) {
                            outputStream.close();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}