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上一篇讲到了使用File的方式来本地化全局对象，它适合体量较大的全局对象。对于一些体量较小的全局，并且对安全性有要求的对象，可以使用SharePreference来进行对像的本地化。

使用实例

//全局对象和上一篇中一样public class User implements Serializable, Cloneable {  public static final long serialVersionUID = 1L;  private int userId;  private String userNikeName;  private String userRealName;  private int userLevel;  private int vipLevel;  public User() {  }  public User(int userId, String userNikeName, String userRealName, int userLevel, int vipLevel) {    this.userId = userId;    this.userNikeName = userNikeName;    this.userRealName = userRealName;    this.userLevel = userLevel;    this.vipLevel = vipLevel;  }  public int getUserId() {    return userId;  }  public void setUserId(int userId) {    this.userId = userId;  }  public String getUserNikeName() {    return userNikeName;  }  public void setUserNikeName(String userNikeName) {    this.userNikeName = userNikeName;  }  public String getUserRealName() {    return userRealName;  }  public void setUserRealName(String userRealName) {    this.userRealName = userRealName;  }  public int getUserLevel() {    return userLevel;  }  public void setUserLevel(int userLevel) {    this.userLevel = userLevel;  }  public int getVipLevel() {    return vipLevel;  }  public void setVipLevel(int vipLevel) {    this.vipLevel = vipLevel;  }  protected User(Parcel in) {    this.userId = in.readInt();    this.userNikeName = in.readString();    this.userRealName = in.readString();    this.userLevel = in.readInt();    this.vipLevel = in.readInt();  }}//下面两个方法实现了Object对象和编码方式为Base64的字符串的互相转换public static final String ObjectToBase64String(Object object) throws IOException {    ByteArrayOutputStream baos = new ByteArrayOutputStream();    ObjectOutputStream oos = new ObjectOutputStream(baos);    oos.writeObject(object);    String base64String = Base64.encodeToString(baos.toByteArray(), Base64.DEFAULT); //采用Base64编码方式编码对象生成的字节数组为字符串    if (oos != null){      oos.close();    }    if (baos != null){      baos.close();    }    return base64String;  }  public static final 
     
       T Base64StringToObject(String base64String, Class
      
        clazz)      throws IOException, ClassNotFoundException {    byte[] bytes = Base64.decode(base64String, Base64.DEFAULT); //解码    ByteArrayInputStream bais = new ByteArrayInputStream(bytes);    ObjectInputStream ois = new ObjectInputStream(bais);    T t = (T) ois.readObject();    if (ois != null) {      ois.close();    }    if (bais != null) {      bais.close();    }    return t;  }  //下面两个方法是进行存取的public class SharePreferencesUtils {  public static final void saveObject(@NonNull Context context, String key, @NonNull Object object)      throws IOException {    SharedPreferences sp = context.getSharedPreferences(key, Context.MODE_PRIVATE);    SharedPreferences.Editor editor = sp.edit();    String base64String = AppUtils.ObjectToBase64String(object);    editor.putString(key, base64String);    editor.commit();  }  public static final 
       
         T restoreObject(@NonNull Context context, String key, Class
        
          clazz)      throws IOException, ClassNotFoundException {    SharedPreferences sp = context.getSharedPreferences(key, Context.MODE_PRIVATE);    String base64String = sp.getString(key, "");    T t = null;    if (!base64String.equals("")){      t = AppUtils.Base64StringToObject(base64String, clazz);    }    return t;  }}//现在就可以开始使用啦private void saveUserToSP(User user){    try {      SharePreferencesUtils.saveObject(this, AppConstant.USER_KEY,user);    } catch (IOException e) {      e.printStackTrace();    }  }  private User restoreUserFromSP(){    User user = null;    try {      user = SharePreferencesUtils.restoreObject(this,AppConstant.USER_KEY,User.class);    } catch (IOException | ClassNotFoundException e) {      e.printStackTrace();    }    return user;  }
        
       
      
     

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