public class PerferenceManager {
private static final String PERF_NAME = “com.util.my_perf”;
private static final int CURRENT_VERSION_CODE = 1;
private volatile static PerferenceManager instance;
private final SharedPreferences preferences;
private PerferenceManager(Context context) {
preferences = context.getSharedPreferences(PERF_NAME, Context.MODE_PRIVATE);
checkPrefVersion();
}
public static PerferenceManager getInstance(Context context) {
if (instance == null) {
synchronized (PerferenceManager.class) {
if (instance == null)
instance = new PerferenceManager(context);
}
}
return instance;
}
public final void putValue(String key, String value) {
preferences.edit().putString(key, value).apply();
}
public final String getValue(String key) {
checkIsLegal(key);
return preferences.getString(key, “”);
}
public final void deleteValue(String key) {
checkIsLegal(key);
preferences.edit().remove(key).apply();
}
public final void clear() {
preferences.edit().clear().apply();
}
private void checkIsLegal(String key) {
if (TextUtils.isEmpty(key))
throw new IllegalArgumentException("This parameter is illegal,key : " + key);
}
private void checkPrefVersion() {
final int oldVersion = preferences.getInt(PERF_NAME, 0);
if (oldVersion < CURRENT_VERSION_CODE) {
preferences.edit()
.clear()
.putInt(PERF_NAME, CURRENT_VERSION_CODE).apply();
}
}
}