I am trying to build an app that will use an SQLite database. My question is once the database is created, will all data still be there once the app is closed, i.e.: the database won't be overwritten when the app is restarted?
You, as a developer are the only one who have access to this database, thus it is only your code which will be allowed to change the state or content of this database.
Yes, the data will remain there.
The data will remain there because of your default create method. There is a status code. You can use SQLScout http://www.idescout.com/ to visualize the table and watch its change step by step.
Yes, data will remain in your application when you close the application. When you run the application the database create in the application.
But yes, if the user uninstalls, the application then user will lose the application. On the other hand, if you want to save the data when the application is uninstalled, then it's better to create the database in SDCard.
Related
Is it possible to update SQLite database of android app outside app?I mean can user modify database according to them where the database situates in default location?
The default location is in /data/data/your-package/databases which is only accessible from your application. No other application is able to access it.
However in some special cases like rooted device, debug mode etc , it is still possible to access the database file and change it.
You can access the DB using Content Provider if you want to access it programmatically. Or If you just want to browse the data then you can follow this post.
I use the ObjectBox in my kotlin project. Users can erase the database by clearing the application Data from the Android settings.
I want to prevent database removal or change ObjectBox Store mode to SQLite!
thanks
In case you want to make user data persistent you definitely should save and check DB copy on your server.
First of all, as you probably know, this is "normal" behavior on Android. When you delete an app's data, you have to start from scratch. E.g. all local data lost and log-in again etc. I'd guess that 0.01% of users would actually know about it and actually do that.
Anyway, yes, the question is if you want to extend data scope to cloud/server... That's a different topic though. ObjectBox will offer data synchronization later this year.
Alternatively, there's also Android's backup function: https://developer.android.com/guide/topics/data/autobackup.html
I have stored some phone number in my application.
I want to do some operation like when i get message from that stored number then I want to send the automatic reply.
Once if we close our application then whether the data will be available or not?
After closing application I want to perform this operation with the data which I stored already.
Is it possible?
If you want to store small information use shared preferences,
http://www.tutorialspoint.com/android/android_shared_preferences.htm
(Or)
If you want store table of bulk information use SQLITE database,
http://www.androidhive.info/2011/11/android-sqlite-database-tutorial/
I have created Sqlite database in app. when I clear data from settings->applications->manage applications the Sqlite db removed. any suggestions to keep sqlite database as it is.
When you press Clear Data from the Android application manager its supposed to remove everything related to the app such as preferences, databases, caches etc the only thing that gets left is the app so when you re-launch it behaves as if it was just installed.
If you want to allow the user to clear the data but keep the database then there should be an option in the menu that removes the shared preferences but doesn't do anything with the database.
Hope this helps.
Android's SQLite is intented for local app data storage. When you opt to wipe your app's data, this data is wiped (as expected).
If you want to persist DB data, look into external storage (eg. the late Parse.com, or MS's Azure). You'll be making network calls, your local data will still be wiped, and you'll need to have a way to link your app back up with the external data post-local-wipe (eg. logging in) but your external data will survive an app data clear.
The "linking up" part can be mitigated as well depending on your use case, eg. Google Play Games' data services is tied to your Google Play id and will resync after an app wipe.
Why would you want to keep the data when the user wants to clear everything.
It is not suggested you keep the db.
I would suggest you use the sd card to store images/text files with the adequate permission from the user.
I am working on some application, where I am storing some of my application data in SQLite DB. If any user clears the data, my data gets cleared. Through How to disable the Clear Data button in Application info of Manage appliaction and http://groups.google.com/group/android-developers/browse_thread/thread/b1091f190f7356b7 these links, I found that we cannot disable clear data button, But my question is Is there any way to catch this action(clear data) in the application? Is there any intent in android to notify this action ?
Thanks in advance
Pushpa
A possible workaround is to program your application to use a SQLite database on external storage. SD card etc. just create a folder on your SD or whatever storage you want, place the .db file in that folder and use that instead of the default storage location. By default, SQLite databases are stored in the data folder(device not rooted so dont know where in the data folder), which is not accesible unless you rooted your device.
There are tutorials out there that use this technique.
Note that, its likely that when you delete your app, the data will persist.
Don't know if that is desirable.
You can do one thing You can create a test table in your DB and insert some data in it. Every time you run the application you check the value of the table exist or not. If data exist that means DB value is not reset and if Table is empty you get to know that DB data is cleared and insert the data again for the next time check.