/**
* Created by 1 on 2018/1/15.
*/
public class SharedPreferencesHelper {
private SharedPreferences sharedPreferences;
/**
* 保存在手机里面的名字
*/
public static final String FILE_NAME = "shared_data";
private SharedPreferences.Editor editor;
public SharedPreferencesHelper(Context context) {
sharedPreferences = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
editor = sharedPreferences.edit();
}
/**
* 保存数据的方法,拿到数据保存数据的基本类型,然后根据类型调用不同的保存方法
*
* @param key
* @param object
*/
public void put(String key, Object object) {
if (object instanceof String) {
editor.putString(key, (String) object);
} else if (object instanceof Integer) {
editor.putInt(key, (Integer) object);
} else if (object instanceof Boolean) {
editor.putBoolean(key, (Boolean) object);
} else if (object instanceof Float) {
editor.putFloat(key, (Float) object);
} else if (object instanceof Long) {
editor.putLong(key, (Long) object);
} else {
editor.putString(key, object.toString());
}
editor.apply();
}
/**
* 获取保存数据的方法,我们根据默认值的到保存的数据的具体类型,然后调用相对于的方法获取值
*
* @param key 键的值
* @param defaultObject 默认值
* @return
*/
public Object get(String key, Object defaultObject) {
if (defaultObject instanceof String) {
return sharedPreferences.getString(key, (String) defaultObject);
} else if (defaultObject instanceof Integer) {
return sharedPreferences.getInt(key, (Integer) defaultObject);
} else if (defaultObject instanceof Boolean) {
return sharedPreferences.getBoolean(key, (Boolean) defaultObject);
} else if (defaultObject instanceof Float) {
return sharedPreferences.getFloat(key, (Float) defaultObject);
} else if (defaultObject instanceof Long) {
return sharedPreferences.getLong(key, (Long) defaultObject);
} else {
return sharedPreferences.getString(key, null);
}
}
/**
* 移除某个key值已经对应的值
*
* @param key
*/
public void remove(String key) {
editor.remove(key);
editor.apply();
}
/**
* 清除所有的数据
*/
public void clear() {
editor.clear();
editor.apply();
}
/**
* 查询某个key是否存在
*
* @param key
* @return
*/
public boolean contains(String key) {
return sharedPreferences.contains(key);
}
/**
* 返回所有的键值对
*
* @return
*/
public Map<String, ?> getAll() {
return sharedPreferences.getAll();
}
/**
* desc:保存对象
*
* @param context
* @param obj 要保存的对象,只能保存实现了serializable的对象
* modified:
*/
public void saveObject(Context context, String key, Object obj) {
try {
// 保存对象
//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
editor.putString(key, bytesToHexString);
editor.commit();
} 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 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 context
* @return modified:
*/
public Object readObject(Context context, String key) {
try {
if (sharedPreferences.contains(key)) {
String string = sharedPreferences.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) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
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 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;
}
}