У меня есть синглтон для SharedPreferences, дело в том, что я использовал только одно SharedPreferences имя файла, но теперь я хотел бы получить что-то вроде: login_preferences или settings_preferences, как правильно их создать и сделать их одноэлементными? Или мне нужно создать класс по одному для каждого типа LoginSharedPreferences, а другой для SettingsSharedPreferences и выполнять там операции?
0
StuartDTO
20 Дек 2019 в 18:10
1 ответ
Да, у вас есть два класса Singleton с разными именами и доступом, как вы сказали.
public class LoginAppState {
private static final String SETTINGS_NAME = "LoginPrfs";
private static LoginAppState sSharedPrefs;
private final SharedPreferences mPref;
private SharedPreferences.Editor mEditor;
private boolean mBulkUpdate = false;
/**
* Enum representing your setting names or key for your setting.
*/
public enum Key {
/* Recommended naming convention:
* ints, floats, doubles, longs:
* SAMPLE_NUM or SAMPLE_COUNT or SAMPLE_INT, SAMPLE_LONG etc.
*
* boolean: IS_SAMPLE, HAS_SAMPLE, CONTAINS_SAMPLE
*
* String: SAMPLE_KEY, SAMPLE_STR or just SAMPLE
*/
TOKEN_STR,
EMAIL_STR,
MEMBERID_STR,
NAME_STR,
}
private LoginAppState(Context context) {
mPref = context.getSharedPreferences(SETTINGS_NAME, Context.MODE_PRIVATE);
}
public static LoginAppState getInstance(Context context) {
if (sSharedPrefs == null) {
sSharedPrefs = new LoginAppState(context.getApplicationContext());
}
return sSharedPrefs;
}
public static LoginAppState getInstance() {
if (sSharedPrefs != null) {
return sSharedPrefs;
}
//Option 1:
throw new IllegalArgumentException("Should use getClient(Context) at least once before using this method.");
//Option 2:
// Alternatively, you can create a new instance here
// with something like this:
// getClient(MyCustomApplication.getAppContext());
}
public void put(Key key, String val) {
doEdit();
mEditor.putString(key.name(), val);
doCommit();
}
public void put(Key key, int val) {
doEdit();
mEditor.putInt(key.name(), val);
doCommit();
}
public void put(Key key, boolean val) {
doEdit();
mEditor.putBoolean(key.name(), val);
doCommit();
}
public void put(Key key, float val) {
doEdit();
mEditor.putFloat(key.name(), val);
doCommit();
}
public void put(Key key, Set<String> set) {
synchronized (this) {
doEdit();
mEditor.remove(AppState.Key.WISHLIST.name());
doCommit();
doEdit();
mEditor.putStringSet(key.name(), set);
doCommit();
}
}
public void putContestSet(Key key, Set<String> set) {
synchronized (this) {
doEdit();
mEditor.remove(Key.CONTESTLIST.name());
doCommit();
doEdit();
mEditor.putStringSet(key.name(), set);
doCommit();
}
}
/**
* Convenience method for storing doubles.
* <p/>
* There may be instances where the accuracy of a double is desired.
* SharedPreferences does not handle doubles so they have to
* cast to and from String.
*
* @param key The enum of the preference to store.
* @param val The new value for the preference.
*/
public void put(Key key, double val) {
doEdit();
mEditor.putString(key.name(), String.valueOf(val));
doCommit();
}
public void put(Key key, long val) {
doEdit();
mEditor.putLong(key.name(), val);
doCommit();
}
public String getString(Key key, String defaultValue) {
return mPref.getString(key.name(), defaultValue);
}
public String getString(Key key) {
return mPref.getString(key.name(), null);
}
public int getInt(Key key) {
return mPref.getInt(key.name(), 0);
}
public int getInt(Key key, int defaultValue) {
return mPref.getInt(key.name(), defaultValue);
}
public long getLong(Key key) {
return mPref.getLong(key.name(), 0);
}
public long getLong(Key key, long defaultValue) {
return mPref.getLong(key.name(), defaultValue);
}
public float getFloat(Key key) {
return mPref.getFloat(key.name(), 0);
}
public float getFloat(Key key, float defaultValue) {
return mPref.getFloat(key.name(), defaultValue);
}
/**
* Convenience method for retrieving doubles.
* <p/>
* There may be instances where the accuracy of a double is desired.
* SharedPreferences does not handle doubles so they have to
* cast to and from String.
*
* @param key The enum of the preference to fetch.
*/
public double getDouble(Key key) {
return getDouble(key, 0);
}
/**
* Convenience method for retrieving doubles.
* <p/>
* There may be instances where the accuracy of a double is desired.
* SharedPreferences does not handle doubles so they have to
* cast to and from String.
*
* @param key The enum of the preference to fetch.
*/
public double getDouble(Key key, double defaultValue) {
try {
String string = mPref.getString(key.name(), String.valueOf(defaultValue));
if (string == null) {
return defaultValue;
}
return Double.valueOf(string);
} catch (Exception e) {
return defaultValue;
}
}
public boolean getBoolean(Key key, boolean defaultValue) {
return mPref.getBoolean(key.name(), defaultValue);
}
public boolean getBoolean(Key key) {
return mPref.getBoolean(key.name(), false);
}
public Set<String> getSet(Key key) {
return mPref.getStringSet(key.name(), new HashSet<>());
}
/**
* Remove keys from SharedPreferences.
*
* @param keys The enum of the key(s) to be removed.
*/
public void remove(Key... keys) {
doEdit();
for (Key key : keys) {
mEditor.remove(key.name());
}
doCommit();
}
/**
* Remove all keys from SharedPreferences.
*/
public void clear() {
doEdit();
mEditor.clear();
doCommit();
}
public boolean isLoggedIn() {
return getString(Key.TOKEN_STR) != null;
}
public void edit() {
mBulkUpdate = true;
mEditor = mPref.edit();
}
public void commit() {
mBulkUpdate = false;
mEditor.commit();
mEditor = null;
}
private void doEdit() {
if (!mBulkUpdate && mEditor == null) {
mEditor = mPref.edit();
}
}
private void doCommit() {
if (!mBulkUpdate && mEditor != null) {
mEditor.commit();
mEditor = null;
}
}
}
И ваш SettingsAppState.java выглядит так
public class SettingsAppState {
private static final String SETTINGS_NAME = "SettingsPrfs";
private static SettingsAppState sSharedPrefs;
private final SharedPreferences mPref;
private SharedPreferences.Editor mEditor;
private boolean mBulkUpdate = false;
/**
* Enum representing your setting names or key for your setting.
*/
public enum Key {
/* Recommended naming convention:
* ints, floats, doubles, longs:
* SAMPLE_NUM or SAMPLE_COUNT or SAMPLE_INT, SAMPLE_LONG etc.
*
* boolean: IS_SAMPLE, HAS_SAMPLE, CONTAINS_SAMPLE
*
* String: SAMPLE_KEY, SAMPLE_STR or just SAMPLE
*/
TOKEN_STR,
EMAIL_STR,
MEMBERID_STR,
NAME_STR,
}
private SettingsAppState(Context context) {
mPref = context.getSharedPreferences(SETTINGS_NAME, Context.MODE_PRIVATE);
}
public static SettingsAppState getInstance(Context context) {
if (sSharedPrefs == null) {
sSharedPrefs = new AppState(context.getApplicationContext());
}
return sSharedPrefs;
}
public static SettingsAppState getInstance() {
if (sSharedPrefs != null) {
return sSharedPrefs;
}
//Option 1:
throw new IllegalArgumentException("Should use getClient(Context) at least once before using this method.");
//Option 2:
// Alternatively, you can create a new instance here
// with something like this:
// getClient(MyCustomApplication.getAppContext());
}
public void put(Key key, String val) {
doEdit();
mEditor.putString(key.name(), val);
doCommit();
}
public void put(Key key, int val) {
doEdit();
mEditor.putInt(key.name(), val);
doCommit();
}
public void put(Key key, boolean val) {
doEdit();
mEditor.putBoolean(key.name(), val);
doCommit();
}
public void put(Key key, float val) {
doEdit();
mEditor.putFloat(key.name(), val);
doCommit();
}
public void put(Key key, Set<String> set) {
synchronized (this) {
doEdit();
mEditor.remove(AppState.Key.WISHLIST.name());
doCommit();
doEdit();
mEditor.putStringSet(key.name(), set);
doCommit();
}
}
public void putContestSet(Key key, Set<String> set) {
synchronized (this) {
doEdit();
mEditor.remove(Key.CONTESTLIST.name());
doCommit();
doEdit();
mEditor.putStringSet(key.name(), set);
doCommit();
}
}
/**
* Convenience method for storing doubles.
* <p/>
* There may be instances where the accuracy of a double is desired.
* SharedPreferences does not handle doubles so they have to
* cast to and from String.
*
* @param key The enum of the preference to store.
* @param val The new value for the preference.
*/
public void put(Key key, double val) {
doEdit();
mEditor.putString(key.name(), String.valueOf(val));
doCommit();
}
public void put(Key key, long val) {
doEdit();
mEditor.putLong(key.name(), val);
doCommit();
}
public String getString(Key key, String defaultValue) {
return mPref.getString(key.name(), defaultValue);
}
public String getString(Key key) {
return mPref.getString(key.name(), null);
}
public int getInt(Key key) {
return mPref.getInt(key.name(), 0);
}
public int getInt(Key key, int defaultValue) {
return mPref.getInt(key.name(), defaultValue);
}
public long getLong(Key key) {
return mPref.getLong(key.name(), 0);
}
public long getLong(Key key, long defaultValue) {
return mPref.getLong(key.name(), defaultValue);
}
public float getFloat(Key key) {
return mPref.getFloat(key.name(), 0);
}
public float getFloat(Key key, float defaultValue) {
return mPref.getFloat(key.name(), defaultValue);
}
/**
* Convenience method for retrieving doubles.
* <p/>
* There may be instances where the accuracy of a double is desired.
* SharedPreferences does not handle doubles so they have to
* cast to and from String.
*
* @param key The enum of the preference to fetch.
*/
public double getDouble(Key key) {
return getDouble(key, 0);
}
/**
* Convenience method for retrieving doubles.
* <p/>
* There may be instances where the accuracy of a double is desired.
* SharedPreferences does not handle doubles so they have to
* cast to and from String.
*
* @param key The enum of the preference to fetch.
*/
public double getDouble(Key key, double defaultValue) {
try {
String string = mPref.getString(key.name(), String.valueOf(defaultValue));
if (string == null) {
return defaultValue;
}
return Double.valueOf(string);
} catch (Exception e) {
return defaultValue;
}
}
public boolean getBoolean(Key key, boolean defaultValue) {
return mPref.getBoolean(key.name(), defaultValue);
}
public boolean getBoolean(Key key) {
return mPref.getBoolean(key.name(), false);
}
public Set<String> getSet(Key key) {
return mPref.getStringSet(key.name(), new HashSet<>());
}
/**
* Remove keys from SharedPreferences.
*
* @param keys The enum of the key(s) to be removed.
*/
public void remove(Key... keys) {
doEdit();
for (Key key : keys) {
mEditor.remove(key.name());
}
doCommit();
}
/**
* Remove all keys from SharedPreferences.
*/
public void clear() {
doEdit();
mEditor.clear();
doCommit();
}
public boolean isLoggedIn() {
return getString(Key.TOKEN_STR) != null;
}
public void edit() {
mBulkUpdate = true;
mEditor = mPref.edit();
}
public void commit() {
mBulkUpdate = false;
mEditor.commit();
mEditor = null;
}
private void doEdit() {
if (!mBulkUpdate && mEditor == null) {
mEditor = mPref.edit();
}
}
private void doCommit() {
if (!mBulkUpdate && mEditor != null) {
mEditor.commit();
mEditor = null;
}
}
}
Вот как вы устанавливаете и получаете доступ к данным из LoginAppState формы Activity.
LoginAppState mLoginAppState = LoginAppState.getInstance(this);
mLoginAppStateput(LoginAppState.Key.NAME_STR,"Stuart DTO");
mLoginAppStateput(LoginAppState.Key.EMAIL_STR,"stauart@stackoverflow.com");
Для доступа к данным из LoginAppState из вашего Activity.
LoginAppState mLoginAppState = LoginAppState.getInstance(this);
mLoginAppState.getString(AppState.Key.NAME_STR,"defualt_value");
mLoginAppState.getString(AppState.Key.EMAIL_STR,"defualt_value");
0
Pavan Nagaraja
21 Дек 2019 в 08:38
Похожие вопросы
Новые вопросы
java
Java - это язык программирования высокого уровня. Используйте этот тег, если у вас возникли проблемы с использованием или пониманием самого языка. Этот тег редко используется отдельно и чаще всего используется вместе с [spring], [spring-boot], [jakarta-ee], [android], [javafx], [hadoop], [gradle] и [maven].
En Español