| /* |
| * Copyright (C) 2014 Google Inc. All Rights Reserved. |
| * |
| * 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. |
| */ |
| |
| package com.example.android.musicservicedemo; |
| |
| import android.graphics.Bitmap; |
| import android.graphics.BitmapFactory; |
| import android.util.Log; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.HttpURLConnection; |
| import java.net.URL; |
| |
| public class Utils { |
| |
| private static final String TAG = "Utils"; |
| |
| /** |
| * Utility method to check that parameters are not null |
| * |
| * @param object |
| */ |
| public static final void checkNotNull(Object object) { |
| if (object == null) { |
| throw new NullPointerException(); |
| } |
| } |
| |
| /** |
| * Utility to download a bitmap |
| * |
| * @param source |
| * @return |
| */ |
| public static Bitmap getBitmapFromURL(String source) { |
| try { |
| URL url = new URL(source); |
| HttpURLConnection httpConnection = (HttpURLConnection) url.openConnection(); |
| httpConnection.setDoInput(true); |
| httpConnection.connect(); |
| InputStream inputStream = httpConnection.getInputStream(); |
| return BitmapFactory.decodeStream(inputStream); |
| } catch (IOException e) { |
| Log.e(TAG, "getBitmapFromUrl: " + source, e); |
| } |
| return null; |
| } |
| |
| /** |
| * Utility method to wrap an index |
| * |
| * @param i |
| * @param size |
| * @return |
| */ |
| public static int wrapIndex(int i, int size) { |
| int m = i % size; |
| if (m < 0) { // java modulus can be negative |
| m += size; |
| } |
| return m; |
| } |
| } |