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
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);
其他回答
使用delegate Kotlin，我们可以轻松地从共享首选项中放置和获取数据。
inline fun <reified T> Context.sharedPrefs(key: String) = object : ReadWriteProperty<Any?, T> {
val sharedPrefs by lazy { this@sharedPrefs.getSharedPreferences("APP_DATA", Context.MODE_PRIVATE) }
val gson by lazy { Gson() }
var newData: T = (T::class.java).newInstance()
override fun getValue(thisRef: Any?, property: KProperty<*>): T {
return getPrefs()
}
override fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
this.newData = value
putPrefs(newData)
}
fun putPrefs(value: T?) {
sharedPrefs.edit {
when (value) {
is Int -> putInt(key, value)
is Boolean -> putBoolean(key, value)
is String -> putString(key, value)
is Long -> putLong(key, value)
is Float -> putFloat(key, value)
is Parcelable -> putString(key, gson.toJson(value))
else -> throw Throwable("no such type exist to put data")
}
}
}
fun getPrefs(): T {
return when (newData) {
is Int -> sharedPrefs.getInt(key, 0) as T
is Boolean -> sharedPrefs.getBoolean(key, false) as T
is String -> sharedPrefs.getString(key, "") as T ?: "" as T
is Long -> sharedPrefs.getLong(key, 0L) as T
is Float -> sharedPrefs.getFloat(key, 0.0f) as T
is Parcelable -> gson.fromJson(sharedPrefs.getString(key, "") ?: "", T::class.java)
else -> throw Throwable("no such type exist to put data")
} ?: newData
}
}
//use this delegation in activity and fragment in following way
var ourData by sharedPrefs<String>("otherDatas")
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);
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();
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();
}
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);
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