MuzeiHelper.java

package com.dm.wallpaper.board.helpers;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;

import com.bluelinelabs.logansquare.LoganSquare;
import com.dm.wallpaper.board.databases.Database;
import com.dm.wallpaper.board.items.Wallpaper;
import com.dm.wallpaper.board.items.WallpaperJson;

import java.io.BufferedInputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Random;

/*
 * Wallpaper Board
 *
 * Copyright (c) 2017 Dani Mahardhika
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class MuzeiHelper {

    private final Database mDatabase;

    public MuzeiHelper(@NonNull Context context) {
        mDatabase = new Database(context);
    }

    @Nullable
    public Wallpaper getRandomWallpaper(String wallpaperUrl) throws Exception {
        if (mDatabase.getWallpapersCount() == 0) {
            URL url = new URL(wallpaperUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setConnectTimeout(15000);

            if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                InputStream stream = new BufferedInputStream(connection.getInputStream());
                WallpaperJson wallpapers = LoganSquare.parse(stream, WallpaperJson.class);
                int size = wallpapers.getWallpapers.size();
                if (size > 0) {
                    int position = getRandomInt(size);
                    return new Wallpaper(
                            wallpapers.getWallpapers.get(position).name,
                            wallpapers.getWallpapers.get(position).author,
                            wallpapers.getWallpapers.get(position).thumbUrl,
                            wallpapers.getWallpapers.get(position).url,
                            wallpapers.getWallpapers.get(position).category);
                }
            }
            return null;
        } else {
            return mDatabase.getRandomWallpaper();
        }
    }

    private int getRandomInt(int size) {
        try {
            Random random = new Random();
            return random.nextInt(size);
        } catch (Exception e) {
            return 0;
        }
    }
}