I use to use user.home + app_name directory under Linux and Windows. However directory given me by Android for user.home has no right to write. So what is common practice of storing application data? My situation even more complicated. The data I need to store belong not to Android application, they belong to web application deployed on Android device, so suggestion using standard Android way may not work for me.
Well, there are many ways to store data in Adroid: http://developer.android.com/guide/topics/data/data-storage.html
If you are running a web application in a Android then you need to use data storage of web apps: http://diveintohtml5.ep.io/storage.html .
If you still want to keep the idea of filesystem access through web app, maybe this tutorial may help you: http://www.vogella.de/articles/AndroidFileSystem/article.html - mind the permissions.
Although, if you need to store data in the Android system you should choose to build an android app instead of use the web app to control the local data storage. You can get data from your web app using a URL Connection (http://developer.android.com/reference/java/net/URLConnection.html) and manage the storage through the Android app.
You can store application data in three ways:
SharedPreferences
SQLite Database
file
All these files are stored under the /data/data/packagename/ directory.
You can use context getFilesDir() method. But check this article for more details.
Keystore- For Sensitive data
SharedPreferences- Easily sharable and accessible data
SQLite- Lot of data with multiple relationships
Related
I have a Xamarin Form application (support for Android and Windows platform) and I am storing the local data in device cache. I would like to share the same cache data with another Xamarin Form App on the same device.
I have tried to access the same Cache from another app with same Key and same structure but its not possible. I am always return null value when I read the data from another App. I am using the same BlobCache (Akavache)/ Xamarin.Essentials and Preferences class from Android.Preferences Library.
I have also tried the ISharedPreferences on another test App for shared the data between two app by local device Cache.
How can we share the data with another Xamarin App ? Can anybody share some example ?
Thanks
Susheel
As #Jason said is a basic feature to net let you read other app's data installed in the same device.
The suggestion would be to have both of the apps to fetch, update/create the data from the same remote place.
I am thinking regarding the future options of my app and I am thinking of the idea of backing-up the data from the application's Database and also sharing that data with another phone, say via e-mail, messaging, Bluetooth, you name it, but basically saving it as a file and opening it from the other phone and having the same values on both phones.
What would be the best approach for such an Android application?
Would Content Providers accomplish exactly this or are they concerned with sharing data only between different Apps? Thanks!
I believe it is possible ,
If you read the documentation about the internal storage here, It mentions
You can save files directly on the device's internal storage. By default, files saved to the internal storage are private to your application and other applications cannot access them
So i believe you can copy the whole sqlite DB file to some temp location then share that file via BT or email or any other sharing option .
But DO NOTE, that the same application package can only access the file if you want perhaps another application to use the db then u need to set the SharedUserId , as mentioned here
Content Providers are generally only for sharing your app's data to other apps.
Content providers are the standard interface that connects data in one process with code running in another process.
Is it possible to access my app's localStorage in other way then via this app?
I am making an app which uses localStorage and I want to be sure there are no possibilities that someone can access my data.
Thank you for your attention and answers.
Phonegap applications are executed on a UIWebView, which uses WebKit engine for all the web-related stuff.
All the navigation data, such as the local storage, caches and so on are stored in the app's data store (a sandbox) and thus can't be accessed from any other apps unless you provide the methods to do so, ie: shared keychains, URIs and so on.
This is built into the iOS security system and there isn't an official way of accessing the data via the public APIS (which doesn't mean it's totally secure). If you are storing sensible information that you don't want to be accessed you should always encrypt such data. Refer to this document if you need more info on the topic.
By default no one can access the data stored in your app except your app itself. In the info.plist file you can add an entry
Application supports iTunes file sharing
If you add this field in your info.plist and set it to YES, only in that case the user can access the data stored in the documents directory by connecting the device to the iTunes.
I am using the SQLite database to store data in my application. Can the databases I created for use in my application be accessed by others or any outside application?
No. The databse file is stored in /data/data/yourpackage.yourapp/database. On a non rooted phone, you don't even have file system access there. Other Applications can not access this file as well, for very good security reasons.
If you want to share data with other applications or want to consume data from other applications, check
http://developer.android.com/guide/topics/providers/content-providers.html
I am a new bee in android platform and creating an application.I Need to save few data in to database and shared between two application.The data I am using for licensing, so my question is Is it possible to others to copy my data base from 'data/data/pack_name/database_name' and put it into a new device?. Any suggestion will be appreciated.
I don't think it is possible for application B to copy application A data without explicit permission of application B. We have content providers specifically for the purpose of sharing data between application. But you can always try this out by creating and application and trying to access it's data from another application.
If the device is rooted then I believe it is possible for another application to copy your data.