基于Android的校园二手交易系统源码校园二手交易APP源码Android本科毕业设计

/** * Copyright (c) 2012-2013, Michael Yang 杨福海 (www.yangfuhai.com). * * 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 cn.hrlly.tao2shou.utils; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.io.RandomAccessFile; import java.io.Serializable; import java.util.Collections; import java.util.HashMap; import java.util.Map; import java.util.Map.Entry; import java.util.Set; import java.util.concurrent.atomic.AtomicInteger; import java.util.concurrent.atomic.AtomicLong; import org.json.JSONArray; import org.json.JSONObject; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.PixelFormat; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import cn.hrlly.tao2shou.domain.CommodityList; /** * 缓存工具类 * User: gengliang * Date: 2016-01-18 * Time: 15:39 */ public class ACache { public static final int TIME_HOUR = 60 * 60; public static final int TIME_DAY = TIME_HOUR * 24; private static final int MAX_SIZE = 1000 * 1000 * 50; // 50 mb private static final int MAX_COUNT = Integer.MAX_VALUE; // 不限制存放数据的数量 private static Map<String, ACache> mInstanceMap = new HashMap<String, ACache>(); private ACacheManager mCache; public static ACache get(Context ctx) { return get(ctx, "ACache"); } public static ACache get(Context ctx, String cacheName) { File f = new File(ctx.getCacheDir(), cacheName); return get(f, MAX_SIZE, MAX_COUNT); } public static ACache get(File cacheDir) { return get(cacheDir, MAX_SIZE, MAX_COUNT); } public static ACache get(Context ctx, long max_zise, int max_count) { File f = new File(ctx.getCacheDir(), "ACache"); return get(f, max_zise, max_count); } public static ACache get(File cacheDir, long max_zise, int max_count) { ACache manager = mInstanceMap.get(cacheDir.getAbsoluteFile() + myPid()); if (manager == null) { manager = new ACache(cacheDir, max_zise, max_count); mInstanceMap.put(cacheDir.getAbsolutePath() + myPid(), manager); } return manager; } private static String myPid() { return "_" + android.os.Process.myPid(); } private ACache(File cacheDir, long max_size, int max_count) { if (!cacheDir.exists() && !cacheDir.mkdirs()) { throw new RuntimeException("can't make dirs in " + cacheDir.getAbsolutePath()); } mCache = new ACacheManager(cacheDir, max_size, max_count); } // ======================================= // ============ String数据 读写 ============== // ======================================= /** * 保存 String数据 到 缓存中 * * @param key * 保存的key * @param value * 保存的String数据 */ public void put(String key, String value) { File file = mCache.newFile(key); BufferedWriter out = null; try { out = new BufferedWriter(new FileWriter(file), 1024); out.write(value); } catch (IOException e) { e.printStackTrace(); } finally { if (out != null) { try { out.flush(); out.close(); } catch (IOException e) { e.printStackTrace(); } } mCache.put(file); } } /** * 保存 String数据 到 缓存中 * * @param key * 保存的key * @param value * 保存的String数据 * @param saveTime * 保存的时间，单位：秒 */ public void put(String key, String value, int saveTime) { put(key, Utils.newStringWithDateInfo(saveTime, value)); } /** * 读取 String数据 * * @param key * @return String 数据 */ public String getAsString(String key) { File file = mCache.get(key); if (!file.exists()) return null; boolean removeFile = false; BufferedReader in = null; try { in = new BufferedReader(new FileReader(file)); String readString = ""; String currentLine; while ((currentLine = in.readLine()) != null) { readString += currentLine; } if (!Utils.isDue(readString)) { return Utils.clearDateInfo(readString); } else { removeFile = true; return null; } } catch (IOException e) { e.printStackTrace(); return null; } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } if (removeFile) remove(key); } } // ======================================= // ============= JSONObject 数据 读写 ============== // ======================================= /** * 保存 JSONObject数据 到 缓存中 * * @param key * 保存的key * @param value * 保存的JSON数据 */ public void put(String key, JSONObject value) { put(key, value.toString()); } /** * 保存 JSONObject数据 到 缓存中 * * @param key * 保存的key * @param value * 保存的JSONObject数据 * @param saveTime * 保存的时间，单位：秒 */ public void put(String key, JSONObject value, int saveTime) { put(key, value.toString(), saveTime); } /** * 读取JSONObject数据 * * @param key * @return JSONObject数据 */ public JSONObject getAsJSONObject(String key) { String JSONString = getAsString(key); try { JSONObject obj = new JSONObject(JSONString); return obj; } catch (Exception e) { e.printStackTrace(); return null; } } // ======================================= // ============ JSONArray 数据 读写 ============= // ======================================= /** * 保存 JSONArray数据 到 缓存中 * * @param key * 保存的key * @param value * 保存的JSONArray数据 */ public void put(String key, JSONArray value) { put(key, value.toString()); } /** * 保存 JSONArray数据 到 缓存中 * * @param key * 保存的key * @param value * 保存的JSONArray数据 * @param saveTime * 保存的时间，单位：秒 */ public void put(String key, JSONArray value, int saveTime) { put(key, value.toString(), saveTime); } /** * 读取JSONArray数据 * * @param key * @return JSONArray数据 */ public JSONArray getAsJSONArray(String key) { String JSONString = getAsString(key); try { JSONArray obj = new JSONArray(JSONString); return obj; } catch (Exception e) { e.printStackTrace(); return null; } } // ======================================= // ============== byte 数据 读写 ============= // ======================================= /** * 保存 byte数据 到 缓存中 * * @param key * 保存的key * @param value * 保存的数据 */ public void put(String key, byte[] value) { File file = mCache.newFile(key); FileOutputStream out = null; try { out = new FileOutputStream(file); out.write(value); } catch (Exception e) { e.printStackTrace(); } finally { if (out != null) { try { out.flush(); out.close(); } catch (IOException e) { e.printStackTrace(); } } mCache.put(file); } } /** * 保存 byte数据 到 缓存中 * * @param key * 保存的key