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.
Related
The MediaPlugin library creates files in
storage/emulated/0/Android/data/[app_name]/files/Pictures/18-Feb-19/1550503112_in.jpg
What would I use to get access to the picture in this path later?
I'm trying to avoid using a hard-coded string... I've tried googling it but I'm getting really confused as to how to get this path by using Android predefined values like android.os.environment.datadirectory or System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyPictures); etc.
Android groups the filesystem into two different types of storage:
1 Internal Storage – this is a portion of the file system that can be accessed only by the application or the operating system.
You can access the internal storage using code like this
System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyPictures)
And the path is like this:
/data/user/0/MyApp.Android/files or /data/data/{package name}/files
2 External Storage – this is a partition for the storage of files that is accessible by all apps, the user, and possibly other devices. On some devices, external storage may be removable (such as an SD card).
You can access the external storage using code like this
Android.Content.Context.GetExternalFilesDir(Android.OS.Environment.DirectoryPictures)
And the path is like this
/storage/emulated/0/Android/data/{package name}/files
So you can see the path Media Plugin has created is the external storage path. You can access it using
Android.Content.Context.GetExternalFilesDir(Android.OS.Environment.DirectoryPictures)
I want to store some media files(mp3) in either external storage (if available) or internal storage.
I've done some reading on the Android developer page and it says that by default only folders stored in internal storage are app-specific and cannot be accessed by other apps or the user.
However, since it may storage space might be limited on some devices, one may want to consider external storage. The issue with this is that other apps can access you folder and read its contents.
Is there a proper way of the files such that they are completely accessible only from my app regardless of whether they are in internal or external storage, preferably a method that doesn't involve encrypting the folder?
I am new to android . I have little confusion on internal storage topic in android. Please correct me if i am worng
InternalStorage :- Allows us to read and write file that are associated with each application's internal memory so the data are private to your app.
This file can only be accessed by the application and cannot be accessed by other application or users
Is it true that InternalStorage store data in device internal memory ?
If answer is yes then how can i store images ,videos etc that user can see and access it on device or by pc when they are connected through usb?
if my app downloads an image and device does not have sdcard and i have used internalstorage method in this condition how user can see dowloaded image using usb or from device ?
It will be good if explanation is given with example .Thanks in advance
You must save your files on external storage. Notice that external storage does not automatically mean removable storage. Normally the devices built-in storage is divided into internal and external storage. However, external storage also includes removable storage like SD cards.
So, if you want to save files that the user should be able to access for example with his PC you should save to the external storage.
The respective user guides on that topic are in particular:
https://developer.android.com/training/basics/data-storage/files.html#InternalVsExternalStorage
https://developer.android.com/guide/topics/data/data-storage.html
For example, if you want to save a picture that is accessible by the user in the expected directory you would use
File picture = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "filename.png");
Since API level 17, MODE_WORLD_READABLE and MODE_WORLD_WRITEABLE are deprecated in internal storage method.so, you cannot write a file that can be accessed by user using internal storage method.
try External Storage to write file so that you can access.for more
https://developer.android.com/guide/topics/data/data-storage.html
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
I want to make a folder on the external memory (could be on SD card) private or protected so that only my application/process can have access to that folder.
Can I do this? if so please let me know?
my requirement:
I can use android's internal memory to store my app's files/data, but that may decrease the phone's internal memory (that can cause problems like not having enough space for other apps to install, etc)
Data on external storage cannot be private. It is world-readable and can be changed by the user if they enable USB mass storage.
Quoted from developer.android.com:
Every Android-compatible device supports a shared "external storage" that you can use to save files. This can be a removable storage media (such as an SD card) or an internal (non-removable) storage. Files saved to the external storage are world-readable and can be modified by the user when they enable USB mass storage to transfer files on a computer.
you cannot.You can zip the folder and store in as pass-worded zip file.
Since API 9 you have for this purpose the
File.setWritable(boolean, boolean)
and also for the read/exec operation. take a look to the link
quote from android docs:
public abstract File getExternalFilesDir (String type)
Since: API Level 8 Returns the absolute path to the directory on the
external filesystem (that is somewhere on
Environment.getExternalStorageDirectory()) where the application can
place persistent files it owns.
These files are private to the
applications, and not typically visible to the user as media. This is
like getFilesDir() in that these files will be deleted when the
application is uninstalled[...]
Source: http://developer.android.com/reference/android/content/Context.html#getExternalFilesDir(java.lang.String)
So basically you will get a private (sorta) folder in your SD card.
Use this in combination with Blackbelt's answer for better effects.