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
您可以使用以下代码存储类对象,并从共享首选项检索任何对象。
将以下依赖项添加到应用gradle中
dependencies {
implementation 'com.google.code.gson:gson:2.8.6'
//Other dependencies of our project
}
在共享pref文件中添加以下代码。
/**
* Saves object into the Preferences.
*
* @param `object` Object of model class (of type [T]) to save
* @param key Key with which Shared preferences to
**/
fun <T> put(`object`: T, key: String) {
//Convert object to JSON String.
val jsonString = GsonBuilder().create().toJson(`object`)
//Save that String in SharedPreferences
preferences.edit().putString(key, jsonString).apply()
}
/**
* Used to retrieve object from the Preferences.
*
* @param key Shared Preference key with which object was saved.
**/
inline fun <reified T> get(key: String): T? {
//We read JSON String which was saved.
val value = preferences.getString(key, null)
//JSON String was found which means object can be read.
//We convert this JSON String to model object. Parameter "c" (of
//type Class < T >" is used to cast.
return GsonBuilder().create().fromJson(value, T::class.java)
}
}
其他回答
您可以使用以下代码存储类对象,并从共享首选项检索任何对象。
将以下依赖项添加到应用gradle中
dependencies {
implementation 'com.google.code.gson:gson:2.8.6'
//Other dependencies of our project
}
在共享pref文件中添加以下代码。
/**
* Saves object into the Preferences.
*
* @param `object` Object of model class (of type [T]) to save
* @param key Key with which Shared preferences to
**/
fun <T> put(`object`: T, key: String) {
//Convert object to JSON String.
val jsonString = GsonBuilder().create().toJson(`object`)
//Save that String in SharedPreferences
preferences.edit().putString(key, jsonString).apply()
}
/**
* Used to retrieve object from the Preferences.
*
* @param key Shared Preference key with which object was saved.
**/
inline fun <reified T> get(key: String): T? {
//We read JSON String which was saved.
val value = preferences.getString(key, null)
//JSON String was found which means object can be read.
//We convert this JSON String to model object. Parameter "c" (of
//type Class < T >" is used to cast.
return GsonBuilder().create().fromJson(value, T::class.java)
}
}
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()
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);
我在使用已接受的答案访问跨活动的共享首选项数据时遇到了麻烦。在这些步骤中,您将为getSharedPreferences提供一个名称以访问它。
在构建中添加以下依赖项。Gradle脚本下的gradel (Module: app)文件:
implementation 'com.google.code.gson:gson:2.8.5'
保存:
MyObject myObject = new MyObject;
//set variables of 'myObject', etc.
SharedPreferences mPrefs = getSharedPreferences("Name", Context.MODE_PRIVATE);
Editor prefsEditor = mPrefs.edit();
Gson gson = new Gson();
String json = gson.toJson(myObject);
prefsEditor.putString("Key", json);
prefsEditor.commit();
在不同的活动中检索:
SharedPreferences mPrefs = getSharedPreferences("Name", Context.MODE_PRIVATE);
Gson gson = new Gson();
String json = mPrefs.getString("Key", "");
MyObject obj = gson.fromJson(json, MyObject.class);
要添加到@MuhammadAamirALi的答案,您可以使用Gson保存和检索对象列表
保存用户定义对象的列表到SharedPreferences
public static final String KEY_CONNECTIONS = "KEY_CONNECTIONS";
SharedPreferences.Editor editor = getPreferences(MODE_PRIVATE).edit();
User entity = new User();
// ... set entity fields
List<Connection> connections = entity.getConnections();
// convert java object to JSON format,
// and returned as JSON formatted string
String connectionsJSONString = new Gson().toJson(connections);
editor.putString(KEY_CONNECTIONS, connectionsJSONString);
editor.commit();
从SharedPreferences获取用户定义对象的列表
String connectionsJSONString = getPreferences(MODE_PRIVATE).getString(KEY_CONNECTIONS, null);
Type type = new TypeToken < List < Connection >> () {}.getType();
List < Connection > connections = new Gson().fromJson(connectionsJSONString, type);