To save and load accurate date, you could use the long (number) representation of a Date object. Example: //getting the current time in milliseconds, and creating a Date object from it: Date date = new Date(System.currentTimeMillis()); //or simply new Date(); //converting it back to a milliseconds representation: long millis = date.getTime(); You can use this … Read more
Do SharedPreferences.OnSharedPreferenceChangeListener spChanged = new SharedPreferences.OnSharedPreferenceChangeListener() { @Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { // your stuff here } }; In your PreferenceActivity, ie make it a member of your PreferenceActivity class and then do registerOnSharedPreferenceChangeListener(spChanged) in the PreferenceActivity.onCreate() method. That’s what I do and I never have a problem. Else it’s your conditional … Read more
I have a login screen and wanted the app to appear as if it’s remained “logged in” at the internal screen after the app is closed/destroyed/phone call/etc. I have a Preferences Object to save values following Login or Register. I read preference values in all the key screen onResume() methods. After login (for example): SharedPreferences … Read more
It only possible to use primitive types because preference keep in memory. But what you can use is serialize your types with Gson into json and put string into preferences: private static SharedPreferences sharedPreferences = context.getSharedPreferences(STORE_FILE_NAME, Context.MODE_PRIVATE); private static SharedPreferences.Editor editor = sharedPreferences.edit(); public <T> void setList(String key, List<T> list) { Gson gson = new … Read more
The method getSharedPreferences is a method of the Context object, so just calling getSharedPreferences from a Fragment will not work…because it is not a Context! (Activity is an extension of Context, so we can call getSharedPreferences from it). So you have to get your applications Context by // this = your fragment SharedPreferences preferences = … Read more
I’m glad you’re already playing with it! Some things to note: (in lazy bullet form) if this is the worst of your problems, your app’s probably in a good spot. 🙂 Writes are generally slower than reads, though, so be sure you’re using SharedPreferenced$Editor.apply() instead of commit(). apply() is new in GB and async (but … Read more
You can save multiple favorites in a single preference by adding numerous favorites in a single string, each favorite item separated by comma. Then you can use convertStringToArray method to convert it into String Array. Here is the full source code. Use MyUtility Methods to save multiple favorite items. MyUtility.addFavoriteItem(this, “Sports”); MyUtility.addFavoriteItem(this, “Entertainment”); get String … Read more
SharedPreferences are written to xml files, so the maximum size of a file on Android is how large a SharedPreferences xml file can be. I can safely say that 40 integer values will not be a problem. The maximum size of a value in a SharedPreferences file is limited to the maximum size of the … Read more
That is because Android M will feature Automatic Backups (old link). Extract: The automatic backup feature preserves the data your app creates on a user device by uploading it to the user’s Google Drive account and encrypting it. There is no charge to you or the user for data storage and the saved data does … Read more
I believe you just need to register/unregister the Listener in your PreferenceFragment and it will work. @Override public void onResume() { super.onResume(); getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(this); } @Override public void onPause() { getPreferenceManager().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this); super.onPause(); } Depending on what you want to do you may not need to use a listener. Changes to the preferences are committed to SharedPreferences … Read more