helper class for Pixabay Response. Since we need to cache query results for 24 hours, this method will be used for caching a result. It will also fetch all the bitmaps and cache these too, since those fetches can be long running and can be initiating from a backround task.

PixabayQueryResult.java

package edu.ggc.lutz.pixabay;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;

import com.google.gson.Gson;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.concurrent.TimeUnit;

import edu.ggc.lutz.pixabay.json.Hit;
import edu.ggc.lutz.pixabay.json.PixabayHttpResponse;

import static edu.ggc.lutz.pixabay.Pixabay.TAG;

public class PixabayQueryResult {

    private static long DAY_MILLIS;
    private static final Gson gson;

    private int responseCode;
    private long created;
    private PixabayHttpResponse response; // taken from jsonschema2pojo without mod
    private HashMap<Long,Bitmap> bitmaps;
    private String responseMethod;

    static {
        gson = new Gson();
        long DAY_MILLIS = TimeUnit.DAYS.toMillis(1);
        Log.v(TAG, "DAY_MILLIS=" + DAY_MILLIS);
    }

    public PixabayQueryResult(String json) throws IOException {

        this.response= gson.fromJson(json, PixabayHttpResponse.class);
        this.created = System.currentTimeMillis(); // birthday!
        cacheBitmaps();
    }

    private void cacheBitmaps() throws IOException {
        this.bitmaps = new HashMap<>();
        for (Hit hit : response.getHits()) {
            InputStream stream = new URL(hit.getWebformatURL()).openStream();
            bitmaps.put(hit.getId(), BitmapFactory.decodeStream(stream));
        }
    }

    public boolean isExpired() {

        return created - System.currentTimeMillis() > DAY_MILLIS ? true : false;
    }

    public long size() {
        return response.getHits().size();
    }

    public String getTags(int index) {
        return getHit(index).getTags();
    }

    public void setResponseCode(int responseCode) {
        this.responseCode = responseCode;
        Log.v(TAG, "responseCode = " + this.responseCode);
    }

    public void setResponseMethod(String responseMethod) {
        this.responseMethod = responseMethod;
        Log.v(TAG, "responseMethod = " + this.responseMethod);
    }

    public Hit getHit(int index) {
        return response.getHits().get(index);
    }

    public Bitmap getBitmap(int index) {
        long id = getHit(index).getId(); // covert response index to Pixabay's id
        return bitmaps.get(id);
    }

}