I am making an Android app, and I will do some process at the first launch of the app.After the first launch I will not these process again. So, for doing this, I want to use SharedPrefences.
How long does it save data? When and how does its saved datas remove?
Data in SharedPrefences is saved until the user uninstalls the app, or clears the app cache
Data in SharedPrefences is saved as file in your app internal storage, its be removed in case:
unInstall app
clear you app data
call yourSharedPreferences.edit().clear().apply()
hope this helps
When you clear the cash memory form settings all the information will be deleted and start fully new. so it not exactly that you need to uninstall your app.
So sharedpreferences is basically store data in primitive way which mean it doesn't contain data directly instead it's reference.
Related
Suppose i made an app which uses shared preferences,
will the data stored with shared preferences be deleted when user clears app storage?
if yes then what is alternative to store/retrieve important data faster which will not get erased by user?
i tried firebase-database, but it is lagging the speed/performance i require.
will the data stored with shared preferences be deleted when user clears app storage?
Yes.
what is alternative to store/retrieve important data faster which will not get erased by user?
Store it on a server.
i tried firebase-database, but it is lagging the speed/performance i require.
Then store it on a faster server, I guess. Or, use a local file as a cache, with the server acting as a backup location, should you need to restore the data at a later point.
I want to store data like in Shared Preference or SQLite in my app . So that the data doesn't get deleted when we clear app data . Infact when we clear data of whatsapp we have to register again,it's registration data also get deleted.But I want to store permanently that first registration data.Is there any way for that?
No. Everything of an app gets cleared when the user either clicks "Clear Data" or uninstalls-and-reinstalls the app.
You can use SDCARD to store data on external storage.
Data will be available until sdcard format or delete your custom storage folder.
You can use BackupManager to store data and restore it, or you can write your own server application to store this data based on device_id, which you can later restore based on device_id
I want to get information from database only one time per day instead of hitting every time and i have to maintain that information like session.Currently i have planned to use Shared Preferences concept.Is it preparable?
I think the option Sharedprefence is the best. But the valuse will be cleared when clearing the app data!
so include some code to check the existance of sharedpreference values. if not existing, then restore them back by collecting data from your DB.. so you have to hit your DB rarely as user does it rarely!
I am having an abstract class having all static objects and function to store some globel data of the application during the execution session.
All data reset to null once I relaunch the application in ICS and above version with Systems's setting ALWAYS_FINISH_ACTIVITIES is set as true.
Whats the better way to mainitan data on application relaunch?
Regards,
Android IT
Editing my question:
I know that Sharepreference can be a better option but I dont want to store data for multiple sessions of the application and data I am storing is huge.
Regards,
Android
IT
Each Android app is running in a dependent process. When an app become background and system need memory, the app's process may be killed by system. In this situation, when app relaunch, static objects will lost.
I think use SharedPreference to maintain data is a better way.
You can store data using SharedPreferences
http://developer.android.com/reference/android/content/SharedPreferences.html
Store the data on the local storage would seem appropriate: http://developer.android.com/training/basics/data-storage/index.html
You can store the data local using a XML file. You can read the XML File on startup with a DOM Reader
http://www.ibm.com/developerworks/library/x-android/
If you have lots of data you can use a SQLite Database
http://developer.android.com/training/basics/data-storage/databases.html
If there are not too much data you can keep them in SharedPreferences
You access them with PreferenceManager.getDefaultSharedPreferences()
Once application exit or destroy that will remove all data . if you want to access after relaunch you should save your data as per your requirement . like local or web. its deepen you. right now you can store data in preference so it will useful after relaunch the application.
I think this is better for you : How to use SharedPreferences in Android to store, fetch and edit values
My android app saves user information as serialized objects in a ".ser" file that's saved to internal storage.
The data can be stored and retrieved and written just fine but whenever the user installs an update to the app, all the data is erased.
I assume the file is deleted upon installation of an update.
My question is: how do I save data to internal storage without it getting deleted when users install updates?
Do I have to use a different method, like SharedPreferences or SQLite?
or can my FileOutputStream save persistently through updates?
If you're worried about it getting deleted on internal memory, why not write to the ext?
Hello Boron I've been using SharedPreferences for the purpose you are explaining. I don't think SQLite would be preferable because you might want to save the images and large information like Bio of the user.
I store all my user data in shared preference and I am almost positive that the data persists even on updating the application. This should solve your problem.
When you have to store the images I would suggest you to convert the image to base 64 or some string and store in SharedPreferences this reduces the chances of deleting of the image from mobile by user accidentally.
Happy Coding