我直接贴出我工具类代码，如下：
/**
* Created by Peng on 2017/10/25.
*/
public class SharedPreferencesUtils {
private static final String TAG = SharedPreferencesUtils.class.getName();
/**
* 保存在手机本地的文件
*/
private static final String FILE_NAME = "file_data";
/**
* 清空数据
*
* @param context 上下文
*/
public static void clear(Context context) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
sp.edit().clear().commit();
}
/**
* 保存boolean变量
*/
public static void saveBoolean(Context context, String key, boolean value) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.putBoolean(key, value).apply();
editor.commit();
}
/**
* 获取boolean变量的值
*
* @param context
* @param key
* @param defValue 获取不到时，给定的默认的值
* @return
*/
public static boolean getBoolean(Context context, String key, boolean defValue) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
return sp.getBoolean(key, defValue);
}
/**
* 保存字符串变量
*/
public static void saveString(Context context, String key, String value) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
sp.edit().putString(key, value).commit();
}
/**
* 获取字符串的值
*
* @param context
* @param key
* @param defValue 获取不到时，给定的默认的值
* @return
*/
public static String getString(Context context, String key, String defValue) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
return sp.getString(key, defValue);
}
/**
* 保存整型变量
*/
public static void saveInt(Context context, String key, int value) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
sp.edit().putInt(key, value).commit();
}
/**
* 获取整型变量的值
*
* @param context
* @param key
* @param defValue 获取不到时，给定的默认的值
* @return
*/
public static int getInt(Context context, String key, int defValue) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
return sp.getInt(key, defValue);
}
/**
* @param context
* @param key
* @param value 保存的值
*/
public static void saveLong(Context context, String key, long value) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
sp.edit().putLong(key, value).commit();
}
/**
* @param context
* @param key
* @param value 获取不到后的默认值
* @return
*/
public static long getLong(Context context, String key, long value) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
return sp.getLong(key, value);
}
/*****************************************保存对象相关******************************************/
/**
* 保存序列化对象到本地（使用时记得在bean类中实现Serializable接口）
*
* @param context
* @param key
* @param object
*/
public static void saveObject(Context context, String key, Object object) {
SharedPreferences.Editor spEdit = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE).edit();
//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 = null;
try {
os = new ObjectOutputStream(bos);
os.writeObject(object);//将对象序列化写入byte缓存
} catch (IOException e) {
e.printStackTrace();
}
//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
spEdit.putString(key, bytesToHexString);
spEdit.commit();
}
/**
* desc:将数组转为16进制
*
* @param bArray
* @return
*/
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();
}
/**
* 从本地反序列化获取对象
*
* @param context
* @param key
* @return
*/
public static Object getObject(Context context, String key) {
SharedPreferences sp = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
if (sp.contains(key)) {
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 = null;
//返回反序列化得到的对象
Object readObject = null;
try {
is = new ObjectInputStream(bis);
readObject = is.readObject();
} catch (Exception e) {
e.printStackTrace();
}
return readObject;
}
}
return null;
}
/**
* desc:将16进制的数据转为数组
*
* @param data
* @return
*/
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_ch1;
if (hex_char1 >= '0' && hex_char1 <= '9')
int_ch1 = (hex_char1 - 48) * 16; // 0 的Ascll - 48
else if (hex_char1 >= 'A' && hex_char1 <= 'F')
int_ch1 = (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_ch2;
if (hex_char2 >= '0' && hex_char2 <= '9')
int_ch2 = (hex_char2 - 48); // 0 的Ascll - 48
else if (hex_char2 >= 'A' && hex_char2 <= 'F')
int_ch2 = hex_char2 - 55; // A 的Ascll - 65
else
return null;
int_ch = int_ch1 + int_ch2;
retData[i / 2] = (byte) int_ch;//将转化后的数放入Byte里
}
return retData;
}
/*****************************************保存对象相关******************************************/
}
当然我也写了个简单的测试例子，该代码如下(下面有下载例子地址)：
/**
* 关于测试SharedPreferencesUtils工具类的界面
*/
public class SharedPreferenceActivity extends AppCompatActivity {
/**
* 测试保存对象
*/
public static final String RESUMEKEY = "resumekey";
/**
* 测试保存的布尔值
*/
public static final String BOOLEANKEY = "booleanKey";
/**
* 测试保存的字符串
*/
public static final String STRINGKEY = "stringkey";
/**
* 测试保存的整型
*/
public static final String INTKEY = "intKey";
/**
* 测试保存的Long型
*/
public static final String LONGKEY = "longkey";
/**
* 上下文
*/
private Context mContext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = this;
/**
* 关于测试SharedPreferencesUtils工具类
*/
goTestSharedPreferencesUtils();
}
/**
* 关于测试SharedPreferencesUtils工具类
*/
private void goTestSharedPreferencesUtils() {
/**
*测试保存布尔值
*/
SharedPreferencesUtils.saveBoolean(mContext, BOOLEANKEY, true);//保存为true
Log.i("testBoolean", SharedPreferencesUtils.getBoolean(mContext, BOOLEANKEY, false) + "");//获取也为true
/**
*测试保存的字符串
*/
SharedPreferencesUtils.saveString(mContext, STRINGKEY, "太阳");//保存为太阳
Log.i("testString", SharedPreferencesUtils.getString(mContext, STRINGKEY, "") + "");//获取也为太阳
/**
*测试保存的整型
*/
SharedPreferencesUtils.saveInt(mContext, INTKEY, 10);//保存为10
Log.i("testInt", SharedPreferencesUtils.getInt(mContext, INTKEY, 0) + "");//获取也为10
/**
*测试保存的Long
*/
SharedPreferencesUtils.saveLong(mContext, LONGKEY, 10000L);//保存为10000
Log.i("testLong", SharedPreferencesUtils.getLong(mContext, LONGKEY, 0L) + "");//获取也为10000
/**
*测试本地保存对象
*/
savaData(createObject());
readData();
}
/**
* 创建一个测试对象
* @return
*/
private Resume createObject() {
Resume resume = new Resume();
resume.setId(1);
resume.setName("小鹏");
resume.setCity("广州");
Resume.MyFood myFood = new Resume.MyFood();
myFood.setType("水果");
ArrayList<Resume.MyFood.FoodListBean> myFoods = new ArrayList<>();
Resume.MyFood.FoodListBean foodListBean = new Resume.MyFood.FoodListBean();
foodListBean.setFoodImg("图片");
foodListBean.setFoodName("苹果");
myFood.setFoodListBeen(myFoods);
resume.setMyFood(myFood);
return resume;
}
/**
* 保存测试对象
*
* @param resume
*/
private void savaData(Resume resume) {
SharedPreferencesUtils.saveObject(mContext, RESUMEKEY, resume);
}
/**
* 读取保存后的测试对象
*/
private void readData() {
Resume resume = (Resume) SharedPreferencesUtils.getObject(mContext, RESUMEKEY);
Log.i("resume", resume.getId() + "/" + resume.getCity() + "/" + resume.getMyFood().getType());
}
}
需要下载这个例子的可以去github下载：
下载地址：https://github.com/pengAndroid/android_my_utils.git