Description: Use Alibaba (fastjson) open source framework + cache framework (storage file) to achieve fast access to files
1. Generic use class
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.qimysafe.ckypit.view.utils.QimCache;
import java.io.File;
import java.util.List;
import java.util.Map;
/**
* 阿里巴巴 json
* implementation 'com.alibaba:fastjson:1.2.13'
* <p>
* QimCache 缓存框架
*/
public class JsonCacheUtils {
//------------------Object--------------------------------------------------------------------------------
/**
* QimCache
* 保存json数据Object
*
* @param strJson 结构体
* @param strName 名称
* @param strFilePath 文件路径
* @param <T> 结构体
*/
public static <T> void setObjectToJson(T strJson, String strName, String strFilePath) {
//list集合序列华为json格式的字符串
String jsonStr = JSON.toJSONString(strJson);
QimCache aCache = QimCache.get(new File(strFilePath));
aCache.remove(strName);
//当前不设置失效时间
aCache.put(strName, jsonStr);//, ACache.TIME_HOUR);// 保存1小时，如果超过1小时去获取这个key，将为null
}
/**
* 获取存放json数据Object
*
* @param strFilePath 文件路径
* @param strName 文件名称
* @param cla 结构类
* @return 返回结构体
* @throws Exception
*/
public static <T> T getObjectToJson(String strFilePath, String strName, Class cla) throws Exception {
QimCache acache = QimCache.get(new File(strFilePath));
String json = acache.getAsString(strName);
T retList = (T) JSON.parseObject(json, cla);
return retList;
}
//------------------list--------------------------------------------------------------------------------
/**
* QimCache
* 保存json数据list
*
* @param strJson 结构体
* @param strName 名称
* @param strFilePath 文件路径
* @param <T> 结构体
*/
public static <T> void setListToJson(List<T> strJson, String strName, String strFilePath) {
//list集合序列华为json格式的字符串
String jsonStr = JSON.toJSONString(strJson);
QimCache aCache = QimCache.get(new File(strFilePath));
aCache.remove(strName);
//当前不设置失效时间
aCache.put(strName, jsonStr);//, ACache.TIME_HOUR);// 保存1小时，如果超过1小时去获取这个key，将为null
}
/**
* 获取存放json数据list 使用方式lists = JsonCacheUtils.getListToJson(strFilePath, "测试0411", InclinometerBen.class);
*
* @param strFilePath 文件路径
* @param strName 文件名称
* @param cla 结构类
* @return 返回结构体
* @throws Exception
*/
public static <T> List<T> getListToJson(String strFilePath, String strName, Class cla) throws Exception {
QimCache acache = QimCache.get(new File(strFilePath));
String json = acache.getAsString(strName);
List retList = JSON.parseArray(json, cla);
return retList;
}
//------------------map--------------------------------------------------------------------------------
//使用 JsonCacheUtils.setMapToJson(MMd, "测试0416", strFilePath);
/**
* QimCache
* 保存json数据map
*
* @param strJson 结构体
* @param strName 名称
* @param strFilePath 文件路径
* @param <K, V> 结构体
*/
public static <K, V> void setMapToJson(Map<K, V> strJson, String strName, String strFilePath) {
//list集合序列华为json格式的字符串
String jsonStr = JSON.toJSONString(strJson);
QimCache aCache = QimCache.get(new File(strFilePath));
aCache.remove(strName);
//当前不设置失效时间
aCache.put(strName, jsonStr);//, ACache.TIME_HOUR);// 保存1小时，如果超过1小时去获取这个key，将为null
}
/**
*
*
* Map 获取
* 1.先定义好结构体
* TypeReference<Map<Integer, InclinometerBen>> typeReference = new TypeReference<Map<Integer, InclinometerBen>>() {
* };
*2.调用方法解析json 返回结构体
* Map<Integer, InclinometerBen> MMd = JsonCacheUtils.getMapToJson(strFilePath, "测试0416", typeReference);
*/
/**
* 获取存放json数据map
*
* @param strFilePath 文件路径
* @param strName 文件名称
* @param cla 结构类
* @return 返回结构体
* @throws Exception
*/
public static <K, V> Map<K, V> getMapToJson(String strFilePath, String strName, TypeReference cla) throws Exception {
QimCache acache = QimCache.get(new File(strFilePath));
String json = acache.getAsString(strName);
Map<K, V> cll = JSON.parseObject(json, cla.getType());
return cll;
}
//------Gson--------------------------------------------------------------------------------------------
/**
* 获取存放json数据list
*
* @param strFilePath
* @param strName
*/
// public static <T> List<T> getGsonList(String strFilePath, String strName, TypeToken typeToken) {
//
// QimCache acache = QimCache.get(new File(strFilePath));
//
// String json = acache.getAsString(strName);
//
// List<T> retList = new Gson().fromJson(json, typeToken.getType());
//
// return retList;
// }
//使用
// TypeToken<List<InclinometerBen>> typeToken = new TypeToken<List<InclinometerBen>>() {
// };
//
// List<InclinometerBen> lists = JsonCacheUtils.getGsonList(strFilePath, "测试0411", typeToken);
}
2. Cache framework
Use big brother Michael Yang Yang Fuhai (www.yangfuhai.com). Open source framework has made a small change
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 org.json.JSONArray;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.io.Serializable;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
/**
* Copyright (c) 2012-2013, Michael Yang 杨福海 (www.yangfuhai.com).
* <p>
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.
*/
/**
* 开源的缓存存储框架
*/
public class QimCache {
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, QimCache> mInstanceMap = new HashMap<String, QimCache>();
private ACacheManager mCache;
public static QimCache get(Context ctx) {
return get(ctx, "QimCache");
}
public static QimCache get(Context ctx, String cacheName) {
File f = new File(ctx.getCacheDir(), cacheName);
//File f = new File(ctx.getFilesDir().getAbsolutePath(), cacheName);
return get(f, MAX_SIZE, MAX_COUNT);
}
public static QimCache get(File cacheDir) {
return get(cacheDir, MAX_SIZE, MAX_COUNT);
}
// public static QimCache get(String cacheDir) {
// File f = new File(cacheDir);
// //File f = new File(ctx.getFilesDir().getAbsolutePath(), cacheName);
//
// return get(f, MAX_SIZE, MAX_COUNT);
// }
public static QimCache get(Context ctx, long max_zise, int max_count) {
File f = new File(ctx.getCacheDir(), "QimCache");
// File f = new File(ctx.getFilesDir().getAbsolutePath(), "QimCache");
return get(f, max_zise, max_count);
}
public static QimCache get(File cacheDir, long max_zise, int max_count) {
QimCache manager = mInstanceMap.get(cacheDir.getAbsoluteFile() + myPid());
if (manager == null) {
manager = new QimCache(cacheDir, max_zise, max_count);
mInstanceMap.put(cacheDir.getAbsolutePath() + myPid(), manager);
}
return manager;
}
private static String myPid() {
return "_" + android.os.Process.myPid();
}
private QimCache(File cacheDir, long max_size, int max_count) {
if (!cacheDir.exists() && !cacheDir.mkdirs()) {
//throw new RuntimeException("can't make dirs in " + cacheDir.getAbsolutePath());
mCache = null;
}
mCache = new ACacheManager(cacheDir, max_size, max_count);
}
/**
* Provides a means to save a cached file before the data are available.
* Since writing about the file is complete, and its close method is called,
* its contents will be registered in the cache. Example of use:
* <p>
* ACache cache = new ACache(this) try { OutputStream stream =
* cache.put("myFileName") stream.write("some bytes".getBytes()); // now
* update cache! stream.close(); } catch(FileNotFoundException e){
* e.printStackTrace() }
*/
class xFileOutputStream extends FileOutputStream {
File file;
public xFileOutputStream(File file) throws FileNotFoundException {
super(file);
this.file = file;
}
@Override
public void close() throws IOException {
super.close();
mCache.put(file);
}
}
// =======================================
// ============ 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);
}
}
/**
* Cache for a stream
*
* @param key the file name.
* @return OutputStream stream for writing data.
* @throws FileNotFoundException if the file can not be created.
*/
public OutputStream put(String key) throws FileNotFoundException {
return new xFileOutputStream(mCache.newFile(key));
}
/**
* @param key the file name.
* @return (InputStream or null) stream previously saved in cache.
* @throws FileNotFoundException if the file can not be opened
*/
public InputStream get(String key) throws FileNotFoundException {
File file = mCache.get(key);
if (!file.exists()) {
return null;
}
return new FileInputStream(file);
}
/**
* 保存 byte数据 到 缓存中
*
* @param key 保存的key
* @param value 保存的数据
* @param saveTime 保存的时间，单位：秒
*/
public void put(String key, byte[] value, int saveTime) {
put(key, Utils.newByteArrayWithDateInfo(saveTime, value));
}
/**
* 获取 byte 数据
*
* @param key
* @return byte 数据
*/
public byte[] getAsBinary(String key) {
RandomAccessFile RAFile = null;
boolean removeFile = false;
try {
File file = mCache.get(key);
if (!file.exists()) {
return null;
}
RAFile = new RandomAccessFile(file, "r");
byte[] byteArray = new byte[(int) RAFile.length()];
RAFile.read(byteArray);
if (!Utils.isDue(byteArray)) {
return Utils.clearDateInfo(byteArray);
} else {
removeFile = true;
return null;
}
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
if (RAFile != null) {
try {
RAFile.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (removeFile) {
remove(key);
}
}
}
// =======================================
// ============= 序列化 数据 读写 ===============
// =======================================
/**
* 保存 Serializable数据 到 缓存中
*
* @param key 保存的key
* @param value 保存的value
*/
public void put(String key, Serializable value) {
put(key, value, -1);
}
/**
* 保存 Serializable数据到 缓存中
*
* @param key 保存的key
* @param value 保存的value
* @param saveTime 保存的时间，单位：秒
*/
public void put(String key, Serializable value, int saveTime) {
ByteArrayOutputStream baos = null;
ObjectOutputStream oos = null;
try {
baos = new ByteArrayOutputStream();
oos = new ObjectOutputStream(baos);
oos.writeObject(value);
byte[] data = baos.toByteArray();
if (saveTime != -1) {
put(key, data, saveTime);
} else {
put(key, data);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
oos.close();
} catch (IOException e) {
}
}
}
/**
* 读取 Serializable数据
*
* @param key
* @return Serializable 数据
*/
public Object getAsObject(String key) {
byte[] data = getAsBinary(key);
if (data != null) {
ByteArrayInputStream bais = null;
ObjectInputStream ois = null;
try {
bais = new ByteArrayInputStream(data);
ois = new ObjectInputStream(bais);
Object reObject = ois.readObject();
return reObject;
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
try {
if (bais != null) {
bais.close();
}
} catch (IOException e) {
e.printStackTrace();
}
try {
if (ois != null) {
ois.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
return null;
}
// =======================================
// ============== bitmap 数据 读写 =============
// =======================================
/**
* 保存 bitmap 到 缓存中
*
* @param key 保存的key
* @param value 保存的bitmap数据
*/
public void put(String key, Bitmap value) {
put(key, Utils.Bitmap2Bytes(value));
}
/**
* 保存 bitmap 到 缓存中
*
* @param key 保存的key
* @param value 保存的 bitmap 数据
* @param saveTime 保存的时间，单位：秒
*/
public void put(String key, Bitmap value, int saveTime) {
put(key, Utils.Bitmap2Bytes(value), saveTime);
}
/**
* 读取 bitmap 数据
*
* @param key
* @return bitmap 数据
*/
public Bitmap getAsBitmap(String key) {
if (getAsBinary(key) == null) {
return null;
}
return Utils.Bytes2Bimap(getAsBinary(key));
}
// =======================================
// ============= drawable 数据 读写 =============
// =======================================
/**
* 保存 drawable 到 缓存中
*
* @param key 保存的key
* @param value 保存的drawable数据
*/
public void put(String key, Drawable value) {
put(key, Utils.drawable2Bitmap(value));
}
/**
* 保存 drawable 到 缓存中
*
* @param key 保存的key
* @param value 保存的 drawable 数据
* @param saveTime 保存的时间，单位：秒
*/
public void put(String key, Drawable value, int saveTime) {
put(key, Utils.drawable2Bitmap(value), saveTime);
}
/**
* 读取 Drawable 数据
*
* @param key
* @return Drawable 数据
*/
public Drawable getAsDrawable(String key) {
if (getAsBinary(key) == null) {
return null;
}
return Utils.bitmap2Drawable(Utils.Bytes2Bimap(getAsBinary(key)));
}
/**
* 获取缓存文件
*
* @param key
* @return value 缓存的文件
*/
public File file(String key) {
File f = mCache.newFile(key);
if (f.exists()) {
return f;
}
return null;
}
/**
* 移除某个key
*
* @param key
* @return 是否移除成功
*/
public boolean remove(String key) {
return mCache.remove(key);
}
/**
* 清除所有数据
*/
public void clear() {
mCache.clear();
}
/**
* @author 杨福海（michael） www.yangfuhai.com
* @version 1.0
* @title 缓存管理器
*/
public class ACacheManager {
private final AtomicLong cacheSize;
private final AtomicInteger cacheCount;
private final long sizeLimit;
private final int countLimit;
private final Map<File, Long> lastUsageDates = Collections.synchronizedMap(new HashMap<File, Long>());
protected File cacheDir;
private ACacheManager(File cacheDir, long sizeLimit, int countLimit) {
this.cacheDir = cacheDir;
this.sizeLimit = sizeLimit;
this.countLimit = countLimit;
cacheSize = new AtomicLong();
cacheCount = new AtomicInteger();
calculateCacheSizeAndCacheCount();
}
/**
* 计算 cacheSize和cacheCount
*/
private void calculateCacheSizeAndCacheCount() {
new Thread(new Runnable() {
@Override
public void run() {
int size = 0;
int count = 0;
File[] cachedFiles = cacheDir.listFiles();
if (cachedFiles != null) {
for (File cachedFile : cachedFiles) {
size += calculateSize(cachedFile);
count += 1;
lastUsageDates.put(cachedFile, cachedFile.lastModified());
}
cacheSize.set(size);
cacheCount.set(count);
}
}
}).start();
}
private void put(File file) {
int curCacheCount = cacheCount.get();
while (curCacheCount + 1 > countLimit) {
long freedSize = removeNext();
cacheSize.addAndGet(-freedSize);
curCacheCount = cacheCount.addAndGet(-1);
}
cacheCount.addAndGet(1);
long valueSize = calculateSize(file);
long curCacheSize = cacheSize.get();
while (curCacheSize + valueSize > sizeLimit) {
long freedSize = removeNext();
curCacheSize = cacheSize.addAndGet(-freedSize);
}
cacheSize.addAndGet(valueSize);
Long currentTime = System.currentTimeMillis();
file.setLastModified(currentTime);
lastUsageDates.put(file, currentTime);
}
private File get(String key) {
File file = newFile(key);
Long currentTime = System.currentTimeMillis();
file.setLastModified(currentTime);
lastUsageDates.put(file, currentTime);
return file;
}
private File newFile(String key) {
return new File(cacheDir, key + ""); //return new File(cacheDir, key.hashCode() + "");
}
private boolean remove(String key) {
File image = get(key);
return image.delete();
}
private void clear() {
lastUsageDates.clear();
cacheSize.set(0);
File[] files = cacheDir.listFiles();
if (files != null) {
for (File f : files) {
f.delete();
}
}
}
/**
* 移除旧的文件
*
* @return
*/
private long removeNext() {
if (lastUsageDates.isEmpty()) {
return 0;
}
Long oldestUsage = null;
File mostLongUsedFile = null;
Set<Map.Entry<File, Long>> entries = lastUsageDates.entrySet();
synchronized (lastUsageDates) {
for (Map.Entry<File, Long> entry : entries) {
if (mostLongUsedFile == null) {
mostLongUsedFile = entry.getKey();
oldestUsage = entry.getValue();
} else {
Long lastValueUsage = entry.getValue();
if (lastValueUsage < oldestUsage) {
oldestUsage = lastValueUsage;
mostLongUsedFile = entry.getKey();
}
}
}
}
long fileSize = calculateSize(mostLongUsedFile);
if (mostLongUsedFile.delete()) {
lastUsageDates.remove(mostLongUsedFile);
}
return fileSize;
}
private long calculateSize(File file) {
return file.length();
}
}
/**
* @author 杨福海（michael） www.yangfuhai.com
* @version 1.0
* @title 时间计算工具类
*/
private static class Utils {
/**
* 判断缓存的String数据是否到期
*
* @param str
* @return true：到期了 false：还没有到期
*/
private static boolean isDue(String str) {
return isDue(str.getBytes());
}
/**
* 判断缓存的byte数据是否到期
*
* @param data
* @return true：到期了 false：还没有到期
*/
private static boolean isDue(byte[] data) {
String[] strs = getDateInfoFromDate(data);
if (strs != null && strs.length == 2) {
String saveTimeStr = strs[0];
while (saveTimeStr.startsWith("0")) {
saveTimeStr = saveTimeStr.substring(1);
}
long saveTime = Long.valueOf(saveTimeStr);
long deleteAfter = Long.valueOf(strs[1]);
return System.currentTimeMillis() > saveTime + deleteAfter * 1000;
}
return false;
}
private static String newStringWithDateInfo(int second, String strInfo) {
return createDateInfo(second) + strInfo;
}
private static byte[] newByteArrayWithDateInfo(int second, byte[] data2) {
byte[] data1 = createDateInfo(second).getBytes();
byte[] retdata = new byte[data1.length + data2.length];
System.arraycopy(data1, 0, retdata, 0, data1.length);
System.arraycopy(data2, 0, retdata, data1.length, data2.length);
return retdata;
}
private static String clearDateInfo(String strInfo) {
if (strInfo != null && hasDateInfo(strInfo.getBytes())) {
strInfo = strInfo.substring(strInfo.indexOf(mSeparator) + 1);
}
return strInfo;
}
private static byte[] clearDateInfo(byte[] data) {
if (hasDateInfo(data)) {
return copyOfRange(data, indexOf(data, mSeparator) + 1, data.length);
}
return data;
}
private static boolean hasDateInfo(byte[] data) {
return data != null && data.length > 15 && data[13] == '-' && indexOf(data, mSeparator) > 14;
}
private static String[] getDateInfoFromDate(byte[] data) {
if (hasDateInfo(data)) {
String saveDate = new String(copyOfRange(data, 0, 13));
String deleteAfter = new String(copyOfRange(data, 14, indexOf(data, mSeparator)));
return new String[]{saveDate, deleteAfter};
}
return null;
}
private static int indexOf(byte[] data, char c) {
for (int i = 0; i < data.length; i++) {
if (data[i] == c) {
return i;
}
}
return -1;
}
private static byte[] copyOfRange(byte[] original, int from, int to) {
int newLength = to - from;
if (newLength < 0) {
throw new IllegalArgumentException(from + " > " + to);
}
byte[] copy = new byte[newLength];
System.arraycopy(original, from, copy, 0, Math.min(original.length - from, newLength));
return copy;
}
private static final char mSeparator = ' ';
private static String createDateInfo(int second) {
String currentTime = System.currentTimeMillis() + "";
while (currentTime.length() < 13) {
currentTime = "0" + currentTime;
}
return currentTime + "-" + second + mSeparator;
}
/*
* Bitmap → byte[]
*/
private static byte[] Bitmap2Bytes(Bitmap bm) {
if (bm == null) {
return null;
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
return baos.toByteArray();
}
/*
* byte[] → Bitmap
*/
private static Bitmap Bytes2Bimap(byte[] b) {
if (b.length == 0) {
return null;
}
return BitmapFactory.decodeByteArray(b, 0, b.length);
}
/*
* Drawable → Bitmap
*/
private static Bitmap drawable2Bitmap(Drawable drawable) {
if (drawable == null) {
return null;
}
// 取 drawable 的长宽
int w = drawable.getIntrinsicWidth();
int h = drawable.getIntrinsicHeight();
// 取 drawable 的颜色格式
Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
// 建立对应 bitmap
Bitmap bitmap = Bitmap.createBitmap(w, h, config);
// 建立对应 bitmap 的画布
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, w, h);
// 把 drawable 内容画到画布中
drawable.draw(canvas);
return bitmap;
}
/*
* Bitmap → Drawable
*/
@SuppressWarnings("deprecation")
private static Drawable bitmap2Drawable(Bitmap bm) {
if (bm == null) {
return null;
}
BitmapDrawable bd = new BitmapDrawable(bm);
bd.setTargetDensity(bm.getDensity());
return new BitmapDrawable(bm);
}
}
}