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);
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
有两个文件解决了共享首选项的所有问题
1)AppPersistence.java
public class AppPersistence {
public enum keys {
USER_NAME, USER_ID, USER_NUMBER, USER_EMAIL, USER_ADDRESS, CITY, USER_IMAGE,
DOB, MRG_Anniversary, COMPANY, USER_TYPE, support_phone
}
private static AppPersistence mAppPersistance;
private SharedPreferences sharedPreferences;
public static AppPersistence start(Context context) {
if (mAppPersistance == null) {
mAppPersistance = new AppPersistence(context);
}
return mAppPersistance;
}
private AppPersistence(Context context) {
sharedPreferences = context.getSharedPreferences(context.getString(R.string.prefrence_file_name),
Context.MODE_PRIVATE);
}
public Object get(Enum key) {
Map<String, ?> all = sharedPreferences.getAll();
return all.get(key.toString());
}
void save(Enum key, Object val) {
SharedPreferences.Editor editor = sharedPreferences.edit();
if (val instanceof Integer) {
editor.putInt(key.toString(), (Integer) val);
} else if (val instanceof String) {
editor.putString(key.toString(), String.valueOf(val));
} else if (val instanceof Float) {
editor.putFloat(key.toString(), (Float) val);
} else if (val instanceof Long) {
editor.putLong(key.toString(), (Long) val);
} else if (val instanceof Boolean) {
editor.putBoolean(key.toString(), (Boolean) val);
}
editor.apply();
}
void remove(Enum key) {
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.remove(key.toString());
editor.apply();
}
public void removeAll() {
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.clear();
editor.apply();
}
}
2)AppPreference.java
public static void setPreference(Context context, Enum Name, String Value) {
AppPersistence.start(context).save(Name, Value);
}
public static String getPreference(Context context, Enum Name) {
return (String) AppPersistence.start(context).get(Name);
}
public static void removePreference(Context context, Enum Name) {
AppPersistence.start(context).remove(Name);
}
}
现在你可以保存,删除或者获取,
保存
AppPreference.setPreference(context, AppPersistence.keys.USER_ID, userID);
删除
AppPreference.removePreference(context, AppPersistence.keys.USER_ID);
-get
AppPreference.getPreference(context, AppPersistence.keys.USER_ID);
其他回答
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;
}
有两个文件解决了共享首选项的所有问题
1)AppPersistence.java
public class AppPersistence {
public enum keys {
USER_NAME, USER_ID, USER_NUMBER, USER_EMAIL, USER_ADDRESS, CITY, USER_IMAGE,
DOB, MRG_Anniversary, COMPANY, USER_TYPE, support_phone
}
private static AppPersistence mAppPersistance;
private SharedPreferences sharedPreferences;
public static AppPersistence start(Context context) {
if (mAppPersistance == null) {
mAppPersistance = new AppPersistence(context);
}
return mAppPersistance;
}
private AppPersistence(Context context) {
sharedPreferences = context.getSharedPreferences(context.getString(R.string.prefrence_file_name),
Context.MODE_PRIVATE);
}
public Object get(Enum key) {
Map<String, ?> all = sharedPreferences.getAll();
return all.get(key.toString());
}
void save(Enum key, Object val) {
SharedPreferences.Editor editor = sharedPreferences.edit();
if (val instanceof Integer) {
editor.putInt(key.toString(), (Integer) val);
} else if (val instanceof String) {
editor.putString(key.toString(), String.valueOf(val));
} else if (val instanceof Float) {
editor.putFloat(key.toString(), (Float) val);
} else if (val instanceof Long) {
editor.putLong(key.toString(), (Long) val);
} else if (val instanceof Boolean) {
editor.putBoolean(key.toString(), (Boolean) val);
}
editor.apply();
}
void remove(Enum key) {
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.remove(key.toString());
editor.apply();
}
public void removeAll() {
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.clear();
editor.apply();
}
}
2)AppPreference.java
public static void setPreference(Context context, Enum Name, String Value) {
AppPersistence.start(context).save(Name, Value);
}
public static String getPreference(Context context, Enum Name) {
return (String) AppPersistence.start(context).get(Name);
}
public static void removePreference(Context context, Enum Name) {
AppPersistence.start(context).remove(Name);
}
}
现在你可以保存,删除或者获取,
保存
AppPreference.setPreference(context, AppPersistence.keys.USER_ID, userID);
删除
AppPreference.removePreference(context, AppPersistence.keys.USER_ID);
-get
AppPreference.getPreference(context, AppPersistence.keys.USER_ID);
在SharedPreferences中存储Model的数组列表
Add this dependency implementation 'com.google.code.gson:gson:2.8.8' Then after you convert your Model Class into JSON using Gson. Gson gson = new Gson(); String json = gson.toJson(chModelArrayList); //here chModelArrayList is a ArrayList<Model> of Model Class Then after you can add this string to SharedPreferences SharedPreferences preferences; //Create Object of SharedPreferences SharedPreferences.Editor editor; //Create Object of SharedPreferences.Editor //initialize SharedPreferences preferences = activity.getPreferences(Context.MODE_PRIVATE); editor = preferences.edit(); //Add-In SharedPreferences editor.putString(key, json); editor.commit(); for your list from SharedPreferences String json = preferences.getString(key, defVal); Gson gson = new Gson(); //Pass Your Model ArrayList in TypeToken Type type = new TypeToken<ArrayList<ChModel>>() {}.getType(); //here you get your list ArrayList<ChModel> switchGroup1 = gson.fromJson(json, type);
我知道这个帖子有点旧了。 但我还是要把这个贴出来,希望它能帮助到一些人。 通过将对象序列化为String,可以将任何Object的字段存储为共享首选项。 这里我使用GSON存储共享首选项的任何对象。
保存对象到首选项:
public static void saveObjectToSharedPreference(Context context, String preferenceFileName, String serializedObjectKey, Object object) {
SharedPreferences sharedPreferences = context.getSharedPreferences(preferenceFileName, 0);
SharedPreferences.Editor sharedPreferencesEditor = sharedPreferences.edit();
final Gson gson = new Gson();
String serializedObject = gson.toJson(object);
sharedPreferencesEditor.putString(serializedObjectKey, serializedObject);
sharedPreferencesEditor.apply();
}
从首选项检索对象:
public static <GenericClass> GenericClass getSavedObjectFromPreference(Context context, String preferenceFileName, String preferenceKey, Class<GenericClass> classType) {
SharedPreferences sharedPreferences = context.getSharedPreferences(preferenceFileName, 0);
if (sharedPreferences.contains(preferenceKey)) {
final Gson gson = new Gson();
return gson.fromJson(sharedPreferences.getString(preferenceKey, ""), classType);
}
return null;
}
注意:
记得在gradle的dependencies中添加compile 'com.google.code.gson:gson:2.6.2'。
例子:
//assume SampleClass exists
SampleClass mObject = new SampleObject();
//to store an object
saveObjectToSharedPreference(context, "mPreference", "mObjectKey", mObject);
//to retrive object stored in preference
mObject = getSavedObjectFromPreference(context, "mPreference", "mObjectKey", SampleClass.class);
更新:
正如@Sharp_Edge在评论中指出的那样,上述解决方案不适用于List。
稍微修改一下getSavedObjectFromPreference()的签名——从Class<GenericClass> classType到Type classType将使这个解决方案一般化。修改后的函数签名
public static <GenericClass> GenericClass getSavedObjectFromPreference(Context context, String preferenceFileName, String preferenceKey, Type classType)
用于调用,
getSavedObjectFromPreference(context, "mPreference", "mObjectKey", (Type) SampleClass.class)
编码快乐!
步骤1:在java文件中复制粘贴这两个函数。
public void setDefaults(String key, String value, Context context) {
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
SharedPreferences.Editor editor = preferences.edit();
editor.putString(key, value);
editor.commit();
}
public static String getDefaults(String key, Context context) {
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
return preferences.getString(key, null);
}
步骤2: 为了节省使用:
setDefaults("key","value",this);
检索使用:
String retrieve= getDefaults("key",this);
你可以通过使用不同的键名来设置不同的共享首选项,比如:
setDefaults("key1","xyz",this);
setDefaults("key2","abc",this);
setDefaults("key3","pqr",this);