我需要在许多地方获得用户对象，其中包含许多字段。登录后，我想保存/存储这些用户对象。我们如何实现这种场景?
我不能这样存储它:
SharedPreferences.Editor prefsEditor = myPrefs.edit();
prefsEditor.putString("BusinessUnit", strBusinessUnit);
当前回答
另一种不使用Json格式保存和恢复android sharedpreferences对象的方法
private static ExampleObject getObject(Context c,String db_name){
SharedPreferences sharedPreferences = c.getSharedPreferences(db_name, Context.MODE_PRIVATE);
ExampleObject o = new ExampleObject();
Field[] fields = o.getClass().getFields();
try {
for (Field field : fields) {
Class<?> type = field.getType();
try {
final String name = field.getName();
if (type == Character.TYPE || type.equals(String.class)) {
field.set(o,sharedPreferences.getString(name, ""));
} else if (type.equals(int.class) || type.equals(Short.class))
field.setInt(o,sharedPreferences.getInt(name, 0));
else if (type.equals(double.class))
field.setDouble(o,sharedPreferences.getFloat(name, 0));
else if (type.equals(float.class))
field.setFloat(o,sharedPreferences.getFloat(name, 0));
else if (type.equals(long.class))
field.setLong(o,sharedPreferences.getLong(name, 0));
else if (type.equals(Boolean.class))
field.setBoolean(o,sharedPreferences.getBoolean(name, false));
else if (type.equals(UUID.class))
field.set(
o,
UUID.fromString(
sharedPreferences.getString(
name,
UUID.nameUUIDFromBytes("".getBytes()).toString()
)
)
);
} catch (IllegalAccessException e) {
Log.e(StaticConfig.app_name, "IllegalAccessException", e);
} catch (IllegalArgumentException e) {
Log.e(StaticConfig.app_name, "IllegalArgumentException", e);
}
}
} catch (Exception e) {
System.out.println("Exception: " + e);
}
return o;
}
private static void setObject(Context context, Object o, String db_name) {
Field[] fields = o.getClass().getFields();
SharedPreferences sp = context.getSharedPreferences(db_name, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
for (Field field : fields) {
Class<?> type = field.getType();
try {
final String name = field.getName();
if (type == Character.TYPE || type.equals(String.class)) {
Object value = field.get(o);
if (value != null)
editor.putString(name, value.toString());
} else if (type.equals(int.class) || type.equals(Short.class))
editor.putInt(name, field.getInt(o));
else if (type.equals(double.class))
editor.putFloat(name, (float) field.getDouble(o));
else if (type.equals(float.class))
editor.putFloat(name, field.getFloat(o));
else if (type.equals(long.class))
editor.putLong(name, field.getLong(o));
else if (type.equals(Boolean.class))
editor.putBoolean(name, field.getBoolean(o));
else if (type.equals(UUID.class))
editor.putString(name, field.get(o).toString());
} catch (IllegalAccessException e) {
Log.e(StaticConfig.app_name, "IllegalAccessException", e);
} catch (IllegalArgumentException e) {
Log.e(StaticConfig.app_name, "IllegalArgumentException", e);
}
}
editor.apply();
}
其他回答
// SharedPrefHelper is a class contains the get and save sharedPrefernce data
public class SharedPrefHelper {
// save data in sharedPrefences
public static void setSharedOBJECT(Context context, String key,
Object value) {
SharedPreferences sharedPreferences = context.getSharedPreferences(
context.getPackageName(), Context.MODE_PRIVATE);
SharedPreferences.Editor prefsEditor = sharedPreferences.edit();
Gson gson = new Gson();
String json = gson.toJson(value);
prefsEditor.putString(key, json);
prefsEditor.apply();
}
// get data from sharedPrefences
public static Object getSharedOBJECT(Context context, String key) {
SharedPreferences sharedPreferences = context.getSharedPreferences(
context.getPackageName(), Context.MODE_PRIVATE);
Gson gson = new Gson();
String json = sharedPreferences.getString(key, "");
Object obj = gson.fromJson(json, Object.class);
User objData = new Gson().fromJson(obj.toString(), User.class);
return objData;
}
}
// save data in your activity
User user = new User("Hussein","h@h.com","3107310890983");
SharedPrefHelper.setSharedOBJECT(this,"your_key",user);
User data = (User) SharedPrefHelper.getSharedOBJECT(this,"your_key");
Toast.makeText(this,data.getName()+"\n"+data.getEmail()+"\n"+data.getPhone(),Toast.LENGTH_LONG).show();
// User is the class you want to save its objects
public class User {
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
private String name,email,phone;
public User(String name,String email,String phone){
this.name=name;
this.email=email;
this.phone=phone;
}
}
// put this in gradle
compile 'com.google.code.gson:gson:2.7'
希望这对你有所帮助:)
如果你的对象很复杂，我建议序列化/XML/JSON，并将这些内容保存到SD卡。你可以在这里找到关于如何保存到外部存储的其他信息: http://developer.android.com/guide/topics/data/data-storage.html#filesExternal
更好的方法是创建一个全局Constants类来保存键或变量以获取或保存数据。
要保存数据，请调用此方法保存来自任何地方的数据。
public static void saveData(Context con, String variable, String data)
{
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(con);
prefs.edit().putString(variable, data).commit();
}
用它来获取数据。
public static String getData(Context con, String variable, String defaultValue)
{
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(con);
String data = prefs.getString(variable, defaultValue);
return data;
}
像这样的方法就可以了
public static User getUserInfo(Context con)
{
String id = getData(con, Constants.USER_ID, null);
String name = getData(con, Constants.USER_NAME, null);
if(id != null && name != null)
{
User user = new User(); //Hope you will have a user Object.
user.setId(id);
user.setName(name);
//Here set other credentials.
return user;
}
else
return null;
}
另一种不使用Json格式保存和恢复android sharedpreferences对象的方法
private static ExampleObject getObject(Context c,String db_name){
SharedPreferences sharedPreferences = c.getSharedPreferences(db_name, Context.MODE_PRIVATE);
ExampleObject o = new ExampleObject();
Field[] fields = o.getClass().getFields();
try {
for (Field field : fields) {
Class<?> type = field.getType();
try {
final String name = field.getName();
if (type == Character.TYPE || type.equals(String.class)) {
field.set(o,sharedPreferences.getString(name, ""));
} else if (type.equals(int.class) || type.equals(Short.class))
field.setInt(o,sharedPreferences.getInt(name, 0));
else if (type.equals(double.class))
field.setDouble(o,sharedPreferences.getFloat(name, 0));
else if (type.equals(float.class))
field.setFloat(o,sharedPreferences.getFloat(name, 0));
else if (type.equals(long.class))
field.setLong(o,sharedPreferences.getLong(name, 0));
else if (type.equals(Boolean.class))
field.setBoolean(o,sharedPreferences.getBoolean(name, false));
else if (type.equals(UUID.class))
field.set(
o,
UUID.fromString(
sharedPreferences.getString(
name,
UUID.nameUUIDFromBytes("".getBytes()).toString()
)
)
);
} catch (IllegalAccessException e) {
Log.e(StaticConfig.app_name, "IllegalAccessException", e);
} catch (IllegalArgumentException e) {
Log.e(StaticConfig.app_name, "IllegalArgumentException", e);
}
}
} catch (Exception e) {
System.out.println("Exception: " + e);
}
return o;
}
private static void setObject(Context context, Object o, String db_name) {
Field[] fields = o.getClass().getFields();
SharedPreferences sp = context.getSharedPreferences(db_name, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
for (Field field : fields) {
Class<?> type = field.getType();
try {
final String name = field.getName();
if (type == Character.TYPE || type.equals(String.class)) {
Object value = field.get(o);
if (value != null)
editor.putString(name, value.toString());
} else if (type.equals(int.class) || type.equals(Short.class))
editor.putInt(name, field.getInt(o));
else if (type.equals(double.class))
editor.putFloat(name, (float) field.getDouble(o));
else if (type.equals(float.class))
editor.putFloat(name, field.getFloat(o));
else if (type.equals(long.class))
editor.putLong(name, field.getLong(o));
else if (type.equals(Boolean.class))
editor.putBoolean(name, field.getBoolean(o));
else if (type.equals(UUID.class))
editor.putString(name, field.get(o).toString());
} catch (IllegalAccessException e) {
Log.e(StaticConfig.app_name, "IllegalAccessException", e);
} catch (IllegalArgumentException e) {
Log.e(StaticConfig.app_name, "IllegalArgumentException", e);
}
}
editor.apply();
}
如果你想存储你从响应中得到的整个对象，它可以通过这样做来实现，
首先，在util类中创建一个将JSON转换为字符串的方法，如下所示。
public static <T> T fromJson(String jsonString, Class<T> theClass) {
return new Gson().fromJson(jsonString, theClass);
}
然后在共享偏好类中执行如下操作，
public void storeLoginResponse(yourResponseClass objName) {
String loginJSON = UtilClass.toJson(customer);
if (!TextUtils.isEmpty(customerJSON)) {
editor.putString(AppConst.PREF_CUSTOMER, customerJSON);
editor.commit();
}
}
然后为getPreferences创建一个方法
public Customer getCustomerDetails() {
String customerDetail = pref.getString(AppConst.PREF_CUSTOMER, null);
if (!TextUtils.isEmpty(customerDetail)) {
return GSONConverter.fromJson(customerDetail, Customer.class);
} else {
return new Customer();
}
}
然后只是调用第一个方法时，你得到的响应和 其次，当你需要从分享偏好中获取数据时
String token = SharedPrefHelper.get().getCustomerDetails().getAccessToken();
这是所有。
希望对你有所帮助。
快乐的编码();
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