Java tutorial
/* * Copyright 2015. Appsi Mobile * * 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.appsimobile.appsii.module.weather; import android.content.Context; import android.graphics.Bitmap; import android.net.Uri; import android.support.annotation.Nullable; import android.text.TextUtils; import android.util.Log; import android.util.LruCache; import android.widget.ImageView; import com.android.volley.DefaultRetryPolicy; import com.android.volley.Request; import com.android.volley.RequestQueue; import com.android.volley.RetryPolicy; import com.android.volley.VolleyError; import com.android.volley.toolbox.ImageLoader; import com.android.volley.toolbox.JsonObjectRequest; import com.android.volley.toolbox.RequestFuture; import com.android.volley.toolbox.Volley; import com.appsimobile.appsii.R; import com.appsimobile.appsii.ResponseParserException; import com.appsimobile.appsii.SimpleJson; import org.json.JSONArray; import org.json.JSONObject; import java.util.List; import java.util.concurrent.ExecutionException; import java.util.concurrent.TimeUnit; import java.util.concurrent.TimeoutException; /** * Created by nick on 12/04/15. */ public class ImageDownloadHelper { public static final int MAX_CACHE_SIZE = 10 * 1024 * 1024; public static final String FLICKR_API_KEY = "11ed8a19c24662dc6b18979902dc6494"; static final String extras = "tags, url_o, url_h"; private static ImageDownloadHelper sImageDownloadHelper; final RequestQueue sRequestQueue; final ImageLoader sImageLoader; private ImageDownloadHelper(Context context) { sRequestQueue = Volley.newRequestQueue(context, null, MAX_CACHE_SIZE); sImageLoader = new ImageLoader(sRequestQueue, createImageCache()) { final RetryPolicy mRetryPolicy = new DefaultRetryPolicy(30000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT); @Override protected Request<Bitmap> makeImageRequest(String requestUrl, int maxWidth, int maxHeight, ImageView.ScaleType scaleType, String cacheKey) { Request<Bitmap> result = super.makeImageRequest(requestUrl, maxWidth, maxHeight, scaleType, cacheKey); result.setRetryPolicy(mRetryPolicy); return result; } }; } /** * Creates a new ImageCache object, used to simplify the constructor */ private static ImageLoader.ImageCache createImageCache() { // Get max available VM memory, exceeding this amount will throw an // OutOfMemory exception. Stored in kilobytes as LruCache takes an // int in its constructor. final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024); // Use 1/8th of the available memory for this memory cache. final int cacheSize = maxMemory / 8; return new FlickrImageCache(cacheSize); } public synchronized static ImageDownloadHelper getInstance(Context context) { if (sImageDownloadHelper == null) { sImageDownloadHelper = new ImageDownloadHelper(context.getApplicationContext()); } return sImageDownloadHelper; } public static int getRotationFromJson(JSONObject result) { SimpleJson simpleJson = new SimpleJson(result); try { return simpleJson.getInt("rotation", 0); } catch (ResponseParserException e) { Log.e("ImageDownloadHelper", "No rotation attr", e); return 0; } } public static int getFallbackDrawableForConditionCode(boolean isDay, int conditionCode) { // http://developer.yahoo.com/weather/ switch (conditionCode) { case 19: // dust or sand case 21: // haze case 20: // foggy case 22: // smoky case 24: // windy case 25: // cold case 26: // cloudy case 27: // mostly cloudy (night) case 28: // mostly cloudy (day) case 29: // partly cloudy (night) case 30: // partly cloudy (day) case 44: // partly cloudy return isDay ? R.drawable.weather_cloudy_day : R.drawable.weather_cloudy_night; case 31: // clear (night) case 33: // fair (night) return R.drawable.weather_clear_night; default: case 34: // fair (day) case 32: // sunny case 36: // hot return isDay ? R.drawable.weather_clear_day : R.drawable.weather_clear_night; case 0: // tornado case 2: // hurricane case 1: // tropical storm case 4: // thunderstorms case 23: // blustery // TODO: add wind case 3: // severe thunderstorms // TODO: add thunder case 5: // mixed rain and snow case 6: // mixed rain and sleet case 7: // mixed snow and sleet case 8: // freezing drizzle case 10: // freezing rain case 13: // snow flurries case 14: // light snow showers case 42: // scattered snow showers case 15: // blowing snow case 16: // snow case 41: // heavy snow case 43: // heavy snow case 46: // snow showers return isDay ? R.drawable.weather_snowy_day : R.drawable.weather_snowy_night; case 18: // sleet case 9: // drizzle case 11: // showers case 12: // showers case 17: // hail case 35: // mixed rain and hail case 37: // isolated thunderstorms case 38: // scattered thunderstorms case 39: // scattered thunderstorms case 40: // scattered showers case 45: // thundershowers case 47: // isolated thundershowers return isDay ? R.drawable.weather_cloudy_day : R.drawable.weather_cloudy_night; } } public static void getEligiblePhotosFromResponse(@Nullable JSONObject jsonObject, List<PhotoInfo> result, int minDimension) { result.clear(); if (jsonObject == null) return; JSONObject photos = jsonObject.optJSONObject("photos"); if (photos == null) return; JSONArray photoArr = photos.optJSONArray("photo"); if (photoArr == null) return; int N = photoArr.length(); for (int i = 0; i < N; i++) { JSONObject object = photoArr.optJSONObject(i); if (object == null) continue; String id = object.optString("id"); if (TextUtils.isEmpty(id)) continue; String urlH = urlFromImageObject(object, "url_h", "width_h", "height_h", minDimension - 100); String urlO = urlFromImageObject(object, "url_o", "width_o", "height_o", minDimension - 100); if (urlH != null) { result.add(new PhotoInfo(id, urlH)); } else if (urlO != null) { result.add(new PhotoInfo(id, urlO)); } } } static String urlFromImageObject(JSONObject object, String u, String w, String h, int minDimension) { String url = object.optString(u); if (TextUtils.isEmpty(url)) return null; int heightO = object.optInt(h); int widthO = object.optInt(w); if (heightO < minDimension || widthO < minDimension) return null; return url; } private static String getTagForConditionCode(int conditionCode) { // http://developer.yahoo.com/weather/ switch (conditionCode) { case 19: // dust or sand return "dust"; case 21: // haze return "haze"; case 20: // foggy return "fog"; case 22: // smoky return "smoky"; case 24: // windy return "windy"; case 25: // cold return "cold"; case 26: // cloudy case 27: // mostly cloudy (night) case 28: // mostly cloudy (day) case 29: // partly cloudy (night) case 30: // partly cloudy (day) case 44: // partly cloudy return "cloudy"; case 31: // clear (night) case 33: // fair (night) case 34: // fair (day) return "clear"; case 32: // sunny return "sunny"; case 36: // hot return "hot"; case 0: // tornado return "tornado"; case 2: // hurricane return "hurricane"; case 1: // tropical storm case 3: // severe thunderstorms case 4: // thunderstorms case 23: // blustery return "thunder"; case 5: // mixed rain and snow case 6: // mixed rain and sleet case 7: // mixed snow and sleet case 8: // freezing drizzle case 10: // freezing rain case 18: // sleet return "snow"; case 9: // drizzle return "drizzle"; case 11: // showers case 12: // showers return "showers"; case 17: // hail case 35: // mixed rain and hail return "hail"; case 37: // isolated thunderstorms case 38: // scattered thunderstorms case 39: // scattered thunderstorms return "thunder"; case 40: // scattered showers return "rainy"; case 45: // thundershowers case 47: // isolated thundershowers return "thunder"; case 13: // snow flurries case 14: // light snow showers case 42: // scattered snow showers case 15: // blowing snow case 16: // snow case 41: // heavy snow case 43: // heavy snow case 46: // snow showers return "snow"; } return "clear"; } public ImageLoader getImageLoader() { return sImageLoader; } @Nullable public JSONObject searchCityWeatherPhotos(String woeid, int conditionCode, boolean day) throws VolleyError { String tags = getTagForConditionCode(conditionCode) + "," + (day ? "day" : "night"); Uri uri = Uri.parse("https://api.flickr.com/services/rest/").buildUpon() .appendQueryParameter("method", "flickr.photos.search") .appendQueryParameter("api_key", FLICKR_API_KEY).appendQueryParameter("sort", "relevance") .appendQueryParameter("tags", tags).appendQueryParameter("tag_mode", "all") .appendQueryParameter("privacy_filter", "1").appendQueryParameter("content_type", "1") .appendQueryParameter("group_id", "1463451@N25"). // appendQueryParameter("group_id", "1553326@N24"). appendQueryParameter("woe_id", woeid).appendQueryParameter("media", "photos") .appendQueryParameter("extras", extras).appendQueryParameter("format", "json") .appendQueryParameter("nojsoncallback", "1").build(); String url = uri.toString(); RequestFuture<JSONObject> requestFuture = RequestFuture.newFuture(); JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, requestFuture, requestFuture); sRequestQueue.add(request); return getResult(requestFuture); } private <T> T getResult(RequestFuture<T> requestFuture) throws VolleyError { try { return requestFuture.get(10, TimeUnit.SECONDS); } catch (InterruptedException | TimeoutException e) { return null; } catch (ExecutionException e) { Throwable cause = e.getCause(); if (cause instanceof VolleyError) throw (VolleyError) cause; return null; } } // // public static void getImageUrlsFromResult(JSONObject jsonObject, List<String> result, // int minDimension) { // result.clear(); // // JSONObject photos = jsonObject.optJSONObject("photos"); // if (photos == null) return; // // JSONArray photoArr = photos.optJSONArray("photo"); // if (photoArr == null) return; // // int N = photoArr.length(); // for (int i = 0; i < N; i++) { // JSONObject object = photoArr.optJSONObject(i); // if (object == null) continue; // // String urlH = urlFromImageObject( // object, "url_h", "width_h", "height_h", minDimension - 100); // // if (urlH != null) { // result.add(urlH); // } else { // String urlO = urlFromImageObject( // object, "url_o", "width_o", "height_o", minDimension - 100); // if (urlO != null) { // result.add(urlO); // } // } // } // } public JSONObject searchCityImage(String woeid) throws VolleyError { Uri uri = Uri.parse("https://api.flickr.com/services/rest/").buildUpon() .appendQueryParameter("method", "flickr.photos.search") .appendQueryParameter("api_key", FLICKR_API_KEY).appendQueryParameter("sort", "relevance") .appendQueryParameter("tag_mode", "all").appendQueryParameter("privacy_filter", "1") .appendQueryParameter("content_type", "1").appendQueryParameter("group_id", "1463451@N25") .appendQueryParameter("woe_id", woeid).appendQueryParameter("media", "photos") .appendQueryParameter("extras", extras).appendQueryParameter("format", "json") .appendQueryParameter("nojsoncallback", "1").build(); String url = uri.toString(); RequestFuture<JSONObject> requestFuture = RequestFuture.newFuture(); JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, requestFuture, requestFuture); sRequestQueue.add(request); return getResult(requestFuture); } public JSONObject loadPhotoInfo(Context context, String photoId) throws VolleyError { Uri uri = Uri.parse("https://api.flickr.com/services/rest/").buildUpon() .appendQueryParameter("method", "flickr.photos.getInfo") .appendQueryParameter("api_key", FLICKR_API_KEY).appendQueryParameter("photo_id", photoId) .appendQueryParameter("format", "json").appendQueryParameter("nojsoncallback", "1").build(); String url = uri.toString(); RequestFuture<JSONObject> requestFuture = RequestFuture.newFuture(); JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, requestFuture, requestFuture); sRequestQueue.add(request); return getResult(requestFuture); } public static class PhotoInfo { public final String id; public final String url; public PhotoInfo(String id, String url) { this.id = id; this.url = url; } } /** * Implements the ImageCache. This is needed for the ImageLoader. * This class uses a simply implementation of LruCache to provide * memory sensitive caching. */ private static class FlickrImageCache implements ImageLoader.ImageCache { private final LruCache<String, Bitmap> mCache; private final int mCacheSize; FlickrImageCache(int cacheSize) { mCacheSize = cacheSize; mCache = new ImageLruCache(mCacheSize); } @Override public Bitmap getBitmap(String url) { return mCache.get(url); } @Override public void putBitmap(String url, Bitmap bitmap) { mCache.put(url, bitmap); } } /** * The memory cache for the images. This is used by the ImageLoader */ private static class ImageLruCache extends LruCache<String, Bitmap> { ImageLruCache(int cacheSize) { super(cacheSize); } @Override protected int sizeOf(String key, Bitmap bitmap) { // The cache size will be measured in kilobytes rather than // number of items. return bitmap.getByteCount() / 1024; } } }