Database is created in Iphone using SQLite.Now I want to use same database file in Android and insert the data into tables.How to do that?
Android Developer
The easiest way is to copy the file in your applications folder say assets folder and copy the database from the local file, first time the app is loading.
this link will give you a solution.
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I have two projects, in the first one i created a database successfully. My question is: is an app capable of processing this database if i copy the .db file from the first project to the location where all android apps save their databases
/data/data/pkgname/databases/yourdatabase.db?
or there would be some missing files?
I think the best solution is to move your database file in public directory after creating it, like sdcard.
In my iOS app I have a large (270MB), pre-populated, read-only sqlite database. I keep the data in the app bundle and query it with no problems. I do not copy the database to the user's documents folder, because it would be pointless in this situation to take up more space with a duplicate database. I have a separate much smaller database I copy to the user's documents folder to store the user's preferences. The app works just fine.
Now I'm trying to port my app to Android using Android Studio, but it does not seem possible to access the database from the assets folder. I have found plenty of documentation on database helper classes for Android, which I have tried, but the approach always seems to be to copy the database from the assets folder to the user's data folder. This would be a waste of space and also in my experience the app is unable to copy the database without crashing (maybe because of the size? I had no problems copying a smaller test database).
Is there a way to access the database without copying it to the user's data folder? If not can anyone think of another way of approaching this?
No, You can not directly write into the files of ASSETS folder in your application as the resources folders are read-only.
So You have to compulsory copy your database first from your assets folder to your sdcard and then only you will be able to read & write into it.
As GrIsHu said, you can only read database from asset folder. If you need to do more operation like create, update, delete you can do a tricks. Copy the database from assets folder to storage and then you can do anything you want.
Here is a quick example of Working with Android Pre Built Database.
There is a easy to use library too for accessing database from assets folder. You can check [Android SQLiteAssetHelper] here.2 Good luck!
This is the logic I am trying to achieve:
Download the database from web services
unzip it
load the database using SQLite asset helper
delete the zip file
I am wondering if it is possible to achieve using SQLite asset helper, or I should use other method?
SQLiteAssetHelp is designed to copy the database file from the assets folder, which is part of the shipped app package.
You already have the file; copying is not necessary.
Just open your file through SQLiteDatabase.
I am wondering if it is possible to achieve using SQLite asset helper
No, sorry.
I am developing an app in android which consists of activities that need to connect to the Database . I added my database file in assets folder which gets copied over to applications database directory on first time the app runs but "assets" directory and "data" directory(on rooted devices) can be accessed by any other application . I'm confusing between using database file or create database in code . If i create database in code it make the database file disappear in the "assets" folder . When users change the file extension from .apk to .zip ,database file will not appear in assest folder . What I should to do ?
Please give me some advice !
Both ways are good and useful it completely depends on your need.
By creating database in code you can secure your data from other applications but it will take so much pain to create it in that way so i suggest you to use a db or sqlite file in assets folder and while copying database on device or data folder use some security parameters to encrypt it or you can hide your app database folder on device so other applications and users will be not able to access it easily.
Well keeping Database in assets folder is not at all a bad practice plus it saves coding of creating a database , as far as you want to make it secure you have to do 2 things
1.keep you database in assests folder , and copy and save it in the internal memory , now its available only to your application and delete it from assests folder .
2.Use Proguard to protect it from somebody decompiling your application and obtaining the assests.
And yea if its a confidential data in the application and your application is worth it then you can also go for "encrypting data" but yea its a TDS task , see for yourself what suits you now.
Honestly, this is the best explained and a very complete tutorial on the subject
SQLite Android Tutorial
Don't get repulsive, because it's a bit longer one. Everything is explained nicely and you don't have to do the thinking about the location of your asset folder on different devices and so on...
Pretty simple question, can I send a already created database (a file, for instance) with my application?
Or do I have to create it inside my application?
Yes you can do both. Either create on 1st launch or copy preconfigured database from assets.
For the latter option (which is basically significantly faster if you need your database to be pre-populated) you can use Android SQLiteAssetHelper to do all the job.
you may put it into the assets/ folder and copy into the SQLite on the first run.
Some apps include an SQLite database in the assets folder, and copy it when the app is launched.