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i developed an app in android wich use a database to save and load data at start. My question is: was it encrypt by default? if not, how can i encrypt my database file in order to make it more secure?
was it encrypt by default?
No.
how can i encrypt my database file in order to make it more secure?
Use SQLCipher for Android and a user-supplied passphrase.
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Wich software should I use to create databases to be used in an Android application? I never had any experience with it and have no idea where to start.
Just addthe db file to your assets. Then copy it from assets to internal storage on startup if it doesn't exist yet. Use a script on your PC to build the db file (sqlite runs on PCs as well).
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I am using Android firebase for the first time so please let me know can I upload CSV files from my mobile to firebase? if yes then how ?
You totally can. You can use Firebase Storage to store your files - csv, images, videos, etc.
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I am a beginner and want to implement an Android application. I decided to use Firebase so can I store Arabic Data using it ?
Firebase stores strings as Unicode. So as long as you ensure it fits into a Unicode character set, you can store Arabic characters.
ref.setValue("أَبْجَدِي");
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I have two different applications in android and I want to connect them with one sqlite database.
Is it possible?
How can I do that?
You can share data! for security if you want to share between just your app, you should sign with same keys.
Secondly, you need to use Content Provider to share data. Some tutorial about Content Provider on CodePath
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So how di I manage a Android database which isn't even located in the assets folder. I followed this tutorial, and it's great, but what if I want to delete and add information to tables manually?
http://www.java2s.com/Code/Android/Database/Createdeleteupdate.htm
You can use other software to modify you Database simply by opening the assets file with that software.
Here is SQLite Expert that is recommended for modifying your Database