一、保存 List<xxx>
/**
* 保存List
*
* @param key
* @param list
*/
public static void putIntList(String key, List<Integer> list) {
//获取SP的edit
SharedPreferences.Editor editor = obtainPrefEditor();
//保存集合的size大小
editor.putInt(key + "_size", list.size());
for (int i = 0; i < list.size(); i++) {
//去掉旧的数据
editor.remove(key + i);
//添加新的数据
editor.putInt(key + i, list.get(i));
}
SharedPreferencesCompat.apply(editor);
}
/**
* 获取List
*
* @param key
* @return
*/
public static List<Integer> getList(String key) {
SharedPreferences sp = obtainPref();
int size = sp.getInt(key + "_size", 0);
List<Integer> list = new ArrayList<>();
for (int i = 0; i < size; i++) {
int anInt = sp.getInt(key + i, 0);
list.add(anInt);
}
return list;
}
二、保存 Object
/**
* desc:保存对象
*
* @param key
* @param obj 要保存的对象,只能保存实现了serializable的对象
* modified:
*/
public static void putObject(String key, Object obj) {
try {
//先将序列化结果写到byte缓存中,其实就分配一个内存空间
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream os = new ObjectOutputStream(bos);
//将对象序列化写入byte缓存
os.writeObject(obj);
//将序列化的数据转为16进制保存
String bytesToHexString = bytesToHexString(bos.toByteArray());
//保存该16进制数组
SharedPreferences.Editor editor = obtainPrefEditor();
editor.putString(key, bytesToHexString);
SharedPreferencesCompat.apply(editor);
} catch (IOException e) {
e.printStackTrace();
Log.e("", "保存obj失败");
}
}
/**
* desc:将数组转为16进制
*
* @param bArray
* @return modified:
*/
public static String bytesToHexString(byte[] bArray) {
if (bArray == null) {
return null;
}
if (bArray.length == 0) {
return "";
}
StringBuffer sb = new StringBuffer(bArray.length);
String sTemp;
for (int i = 0; i < bArray.length; i++) {
sTemp = Integer.toHexString(0xFF & bArray[i]);
if (sTemp.length() < 2)
sb.append(0);
sb.append(sTemp.toUpperCase());
}
return sb.toString();
}
/**
* desc:获取保存的Object对象
*
* @param key
* @return modified:
*/
public static Object getObject(String key) {
try {
SharedPreferences sp = obtainPref();
String string = sp.getString(key, "");
if (TextUtils.isEmpty(string)) {
return null;
} else {
//将16进制的数据转为数组,准备反序列化
byte[] stringToBytes = StringToBytes(string);
ByteArrayInputStream bis = new ByteArrayInputStream(stringToBytes);
ObjectInputStream is = new ObjectInputStream(bis);
//返回反序列化得到的对象
Object readObject = is.readObject();
return readObject;
}
} catch (StreamCorruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//所有异常返回null
return null;
}
/**
* desc:将16进制的数据转为数组
* <p>创建人:聂旭阳 , 2014-5-25 上午11:08:33</p>
*
* @param data
* @return modified:
*/
public static byte[] StringToBytes(String data) {
String hexString = data.toUpperCase().trim();
if (hexString.length() % 2 != 0) {
return null;
}
byte[] retData = new byte[hexString.length() / 2];
for (int i = 0; i < hexString.length(); i++) {
int int_ch; // 两位16进制数转化后的10进制数
char hex_char1 = hexString.charAt(i); ////两位16进制数中的第一位(高位*16)
int int_ch3;
if (hex_char1 >= '0' && hex_char1 <= '9')
int_ch3 = (hex_char1 - 48) * 16; //// 0 的Ascll - 48
else if (hex_char1 >= 'A' && hex_char1 <= 'F')
int_ch3 = (hex_char1 - 55) * 16; //// A 的Ascll - 65
else
return null;
i++;
char hex_char2 = hexString.charAt(i); ///两位16进制数中的第二位(低位)
int int_ch4;
if (hex_char2 >= '0' && hex_char2 <= '9')
int_ch4 = (hex_char2 - 48); //// 0 的Ascll - 48
else if (hex_char2 >= 'A' && hex_char2 <= 'F')
int_ch4 = hex_char2 - 55; //// A 的Ascll - 65
else
return null;
int_ch = int_ch3 + int_ch4;
retData[i / 2] = (byte) int_ch;//将转化后的数放入Byte里
}
return retData;
}