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
我的utils类保存列表到SharedPreferences
public class SharedPrefApi {
private SharedPreferences sharedPreferences;
private Gson gson;
public SharedPrefApi(Context context, Gson gson) {
this.sharedPreferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
this.gson = gson;
}
...
public <T> void putObject(String key, T value) {
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(key, gson.toJson(value));
editor.apply();
}
public <T> T getObject(String key, Class<T> clazz) {
return gson.fromJson(getString(key, null), clazz);
}
}
使用
// for save
sharedPrefApi.putList(SharedPrefApi.Key.USER_LIST, userList);
// for retrieve
List<User> userList = sharedPrefApi.getList(SharedPrefApi.Key.USER_LIST, User.class);
. 我的utils的完整代码//检查使用实例的活动代码
其他回答
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();
我的utils类保存列表到SharedPreferences
public class SharedPrefApi {
private SharedPreferences sharedPreferences;
private Gson gson;
public SharedPrefApi(Context context, Gson gson) {
this.sharedPreferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
this.gson = gson;
}
...
public <T> void putObject(String key, T value) {
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(key, gson.toJson(value));
editor.apply();
}
public <T> T getObject(String key, Class<T> clazz) {
return gson.fromJson(getString(key, null), clazz);
}
}
使用
// for save
sharedPrefApi.putList(SharedPrefApi.Key.USER_LIST, userList);
// for retrieve
List<User> userList = sharedPrefApi.getList(SharedPrefApi.Key.USER_LIST, User.class);
. 我的utils的完整代码//检查使用实例的活动代码
试试这个最好的方法:
PreferenceConnector.java
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
public class PreferenceConnector {
public static final String PREF_NAME = "ENUMERATOR_PREFERENCES";
public static final String PREF_NAME_REMEMBER = "ENUMERATOR_REMEMBER";
public static final int MODE = Context.MODE_PRIVATE;
public static final String name = "name";
public static void writeBoolean(Context context, String key, boolean value) {
getEditor(context).putBoolean(key, value).commit();
}
public static boolean readBoolean(Context context, String key,
boolean defValue) {
return getPreferences(context).getBoolean(key, defValue);
}
public static void writeInteger(Context context, String key, int value) {
getEditor(context).putInt(key, value).commit();
}
public static int readInteger(Context context, String key, int defValue) {
return getPreferences(context).getInt(key, defValue);
}
public static void writeString(Context context, String key, String value) {
getEditor(context).putString(key, value).commit();
}
public static String readString(Context context, String key, String defValue) {
return getPreferences(context).getString(key, defValue);
}
public static void writeLong(Context context, String key, long value) {
getEditor(context).putLong(key, value).commit();
}
public static long readLong(Context context, String key, long defValue) {
return getPreferences(context).getLong(key, defValue);
}
public static SharedPreferences getPreferences(Context context) {
return context.getSharedPreferences(PREF_NAME, MODE);
}
public static Editor getEditor(Context context) {
return getPreferences(context).edit();
}
}
写入值:
PreferenceConnector.writeString(this, PreferenceConnector.name,"Girish");
并获得价值使用:
String name= PreferenceConnector.readString(this, PreferenceConnector.name, "");
关于这个问题有很多很好的答案,穆罕穆德·阿米尔·阿里和穆哈默德·埃尔-班纳在Kotlin使用通用方法实现了答案。
为了节省
fun storeObjectInSharedPref(dataObject: Any, prefName: String): Boolean{
val dataObjectInJson = Gson().toJson(dataObject)
prefsEditor.putString(prefName, dataObjectInJson)
return prefsEditor.commit()
}
检索
fun <T> retrieveStoredObject(prefName: String, baseClass: Class<T>): T?{
val dataObject: String? = preferences.getString(prefName, "")
return Gson().fromJson(dataObject, baseClass)
}
要了解Kotlin中的泛型,请访问这里
这么多好答案,她是我的2美分
我更喜欢使用内联函数和旧风格的put和get值
object PreferenceHelper {
private const val PREFERENCES_KEY = "MyLocalPreference"
private fun getPreference(context: Context): SharedPreferences {
return context.getSharedPreferences(
PREFERENCES_KEY,
Context.MODE_PRIVATE
)
}
fun setBoolean(appContext: Context, key: String?, value: Boolean?) =
getPreference(appContext).edit().putBoolean(key, value!!).apply()
fun setInteger(appContext: Context, key: String?, value: Int) =
getPreference(appContext).edit().putInt(key, value).apply()
fun setFloat(appContext: Context, key: String?, value: Float) =
getPreference(appContext).edit().putFloat(key, value).apply()
fun setString(appContext: Context, key: String?, value: String?) =
getPreference(appContext).edit().putString(key, value).apply()
// To retrieve values from shared preferences:
fun getBoolean(appContext: Context, key: String?, defaultValue: Boolean?): Boolean =
getPreference(appContext).getBoolean(key, defaultValue!!)
fun getInteger(appContext: Context, key: String?, defaultValue: Int): Int =
getPreference(appContext)
.getInt(key, defaultValue)
fun getString(appContext: Context, key: String?, defaultValue: String?): String? =
getPreference(appContext)
.getString(key, defaultValue)
}
使用
PreferenceHelper.setString(context,"CUSTOMER_NAME", "HITESH")
Toast.makeText(context, "Hello " + PreferenceHelper.getString(context,"CUSTOMER_NAME", "User"), Toast.LENGTH_LONG).show()