I am developing an android application and i need to read words from a file to create a Trie. Is there a way i can write the file to internal storage on install so that only my application can access it, or should i hard code the words. Any suggestions are appreciated
If the file isn't going to change, you should put it in your assets directory. If it is going to change, you can copy it from your assets to internal storage and it'll be private. External storage (often an SD card) is word-readable.
http://developer.android.com/guide/topics/data/data-storage.html
http://developer.android.com/reference/android/content/res/AssetManager.html
Related
I have a zip file. I am unzipping it to internal storage. When unzipping each file, I am keeping the same folder structure. After unzipping all levels, I want to display the files using appropriate third party apps like adobe reader etc.
I can unzipping and creating files with same folder structure. But the problem is the files could not be displayed through external app, because of permission. I couldn't set WORLD_READABLE PERMISSION, because the files are storing in custom folders. I applied setReadable also. But no hope.
How can I show files, or how to get permission to files?
Any help would be appreciated..
Thanks
Jomia
Use FileProvider to serve up the files from your app's internal storage using a ContentProvider.
Or, put the files on external storage, instead of internal storage.
I'm geting a file from server, and storing it on the phone. It's a PDF. Then I need to display . Assuming that I have a PDF viewer it will open the file.
The question is where should I store the PDF file so my pdf reader has access to it. I don't really want use external storage since not all phones has one. Is there a way to save public file on internal storage?
Or there is some way to pass the necessary information using ContentProvider. Unfortunately I would need some sample code of that.
All you put under internal directory can't be access by other applications. so getDir or getCacheDir have to be used only for your application.
If you need files to be open by other application you have to write files under SD card.
Where does downloaded files stored in android when there is no memory card and how to access it from my application?
They are stored in device's internal storage, if you haven't chosen to store it in the sd-card. Internal storage make use of linux file system permissions, so files will private to your application and other applications cannot access them.
If you are talking about media files, you can make them accessible everywhere by adding them in their respective content providers. To open a file use openFileOutput() which return a file stream.
You should read the article on Storage Options which also provides a code example for accessing the external storage.
Can anyone help me ? Is it possible to create shared preference files in sdcard rather than on private path of an android application.
You cannot modify where shared preferences are stored.Its a private storage. if you want to use sd card use
Environment.getExternalStorageDirectory(). and get the path of directories stored in sdcard.
it is possible by reading&writing the xml file into the external storage ,but it's not the same as sharedPreferences. you will have to implement your own way , or use the android code of this class.
however , there are some disadvantage over using the internal storage:
anything you store on the sdcard is visible to every application and the end user can read it by just opening it.
only in the internal storage you get some sort of protection against reading the file , so that only rooted devices can read the files.
external storage can also be unmounted , so the data can sometimes be unreachable. you need to handle possible errors that can occur because of this.
uninstalling the app while the sd card is mounted means that the data will stay on the sdcard .
I have file in Assets and I need to write this file to the Internal memory (not to the private part as a /data/data/mypackage/files, but to the memory I am able to see as a removable disk, when I am connected to PC). Is there any way how to achieve this? I don't mean the method for file copy, but how to access my internal memory?
Here is a discussion that answers this problem. I'm assuming that you want to copy your asset to the SD card.
How to copy files from 'assets' folder to sdcard?
I'm not entirely certain about what you are asking, it sounds like you want to write to the SD card, but that's also usually considered external memory. If this is what you mean though, here is the documentation you need to read: http://developer.android.com/guide/topics/data/data-storage.html#filesExternal