I've created a program where a user can create an arrayList, and then that list is saved into a text file on the storage device. I used this code from https://developer.android.com/training/basics/data-storage/files.html :
String filename = "myfile";
String string = "Hello world!";
FileOutputStream outputStream;
try {
outputStream = openFileOutput(filename, Context.MODE_PRIVATE);
outputStream.write(string.getBytes());
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
I want to find a way to put this onto external storage. I know what you're thinking: Why not just do it like the way they have posted? Well I don't have an external sdcard in my phone, and I use the internal storage, which is still an sd card (When I go to storage settings it shows user application space and internal sd card storage, there is an external sd card storage- I just don't have an sdcard). I know there is an Environment.get... but that is for external. When I use Context.MODE_PRIVATE, it is storing it in the app's folder, but I need the user to be able to access this file, and copy it onto a computer after.
Well I don't have an external sdcard in my phone
That is not external storage. That is removable storage.
When I go to storage settings it shows user application space and internal sd card storage
What an Android device reports to the user, and what the Android SDK reports to you, are different. Internal storage and external storage are both part of the on-board flash. The only difference is that external storage is something that the user (and other apps) can access, while each app's portion of internal storage is inaccessible to most users.
I know there is an Environment.get... but that is for external
getExternalStoragePublicDirectory() on Environment, and getExternalFilesDir() on Context are for external storage. External storage is not removable storage.
When I use Context.MODE_PRIVATE, it is storing it in the app's folder, but I need the user to be able to access this file, and copy it onto a computer after.
Then use getExternalStoragePublicDirectory() on Environment if it fits one of those types of public directories. Otherwise, use getExternalFilesDir() on Context. Both point to locations on external storage, which the user can access (e.g., mount the device as a drive in Windows).
Related
Internal Storage Path
Consider the above picture. It shows the folders and file in internal storage. My problem is i am not able to get the absolute path of the internal storage. I Have tried using
String path = getFilesDir().getAbsolutePath();
but it is giving me the path of my app storage. My objective is to backup a file from the private storage of my app to the top of internal storage. And i am unable to find a solution on web and neither on stack overflow. Suggest a solution to this problem!
Environment.getExternalStorageDirectory();
Return the primary shared/external storage directory.
Note: don't be confused by the word "external" here. This directory can better be thought as media/shared storage. It is a filesystem that can hold a relatively large amount of data and that is shared across all applications (does not enforce permissions). Traditionally this is an SD card, but it may also be implemented as built-in storage in a device that is distinct from the protected internal storage and can be mounted as a filesystem on a computer.
File dir = Environment.getExternalStorageDirectory();
String path = dir.getAbsolutePath();
It is only possible with root access. You should write you backup to external storage to make it world-readable. Android docs says that if you want to share file with other apps or store this file even after app will be deleted you should save it to external storage. Android docs
Try this,
String path = Environment.getExternalStorageDirectory().getAbsolutePath();
I'm developing an application that download a lot of data ( about 5 GB) from the network. Due to internal storage disk space, I want to allow the user to choose the "sd card" destination: internal sd card or external sd card (micro sd).
Consider that the path can change for each manufacturer, how I can retrieve a list of all "sd cards" available? (even if is an internal application that will be used only with Samsung tablet)
Try this:
Internal Memory:
String extStore = System.getenv("EXTERNAL_STORAGE");
File f_exts = new File(extStore);
External SD Card:
String secStore = System.getenv("SECONDARY`_STORAGE");
File f_secs = new File(secStore);
You can do that in several ways.
First: 'the old way' use getExternalFilesDirs(). The first entry is external memory. (The same delivered by getExternalFilesDir()). The second entry the sd card. The third a USB OTG drive.
Second: Use Storage Access Framework and let the user use with Intent.ACTION_OPEN_DOCUMENT_TREE.
Third: For Android 7 only. Use Volume Manager.
Can we not simply create new directory programmatically on external SD card (not internal memory of device) in Android and can we not write files on SD card?
Is Titanium so restricted to always write files on internal memory even after using Ti.Filesystem.externalStorageDirectory?
Can someone who has ever been able to create a new directory programmatically on SD card in Android write the answer here or no one ever needs to write something on external SD card?
You can use System class to get storage variables like below
To get the internal SD card you can use
String extStore = System.getenv("EXTERNAL_STORAGE");
File f_exts = new File(extStore);
To get the external SD card you can use
String secStore = System.getenv("SECONDARY_STORAGE");
File f_secs = new File(secStore);
You can choose where to create folder and which one to use.
EDIT
Environment.getExternalStorageDirectory() Details
Return the primary shared/external storage directory.
This directory may not currently be accessible if it has been mounted by the user on their computer, has been removed from the device, or some other problem has happened. You can determine its current state with getExternalStorageState().
Note: don't be confused by the word "external" here. This directory can better be thought as media/shared storage. It is a filesystem that can hold a relatively large amount of data and that is shared across all applications (does not enforce permissions). Traditionally this is an SD card, but it may also be implemented as built-in storage in a device that is distinct from the protected internal storage and can be mounted as a filesystem on a computer.
Reference from Environment
Hope it'll help.
try this create folder and file in sdcard
File localFile = new File(Environment.getExternalStorageDirectory(),"/data/create_new_folder_name/");
if (!localFile.exists()) {
localFile.mkdir();
}
try{
File gpxfile = new File(localFile, "yourfilename.xyz");
FileWriter writer = new FileWriter(gpxfile,true);
writer.append("your file text");
writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
manifest.xml permission
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Use the Storage Access Framework to write on the micro SD card. Google for ACTION_OPEN_DOCUMENT_TREE and ACTION_OPEN_DOCUMENT.
Besides that you can write in a normal way in one app specific directory on the micro SD card. Have a look at the second entry returned by getExternalFilesDirs().
I am working on Android app that has to save data to files. To make the files accessible for all apps and also transfer to computer through USB, the files should be saved in a folder called "ABC". I manually created the folder "ABC" on both external storage card and internal storage. I was able to get full path of that folder on external storage card through code and was able to write and read from it.
String path = Environment.getExternalStorageDirectory().toString() + "/ABC";
But the internal storage turns out to be more elusive because I could not get the full path of "ABC" folder on the internal storage. Is there a way to programmatically determine where folders are created on internal storage? Generally, under what partion are folders created on internal storage in Android?
Edit:
Internal storage - I mean non-removable storage
External Storage - I mean Removable storage
I manually created the folder "ABC" on both external storage card and internal storage.
You might have created this directory on external storage. Unless you are testing on a device or emulator, you did not create this directory on internal storage, as you do not have access to it. A "card" would imply removable storage, which is something else entirely, for the vast majority of Android devices.
I was able to get full path of that folder on external storage card through code and was able to write and read from it.
Your code is for external storage. On very few devices is that a "card".
But the internal storage turns out to be more elusive because I could not get the full path of "ABC" folder on the internal storage.
There is no "ABC" folder on internal storage, insofar as you cannot create a /ABC directory off of the device root, or even off of /data. You can only work for your app's portion of internal storage, using methods like getFilesDir(). And, again, unless you are testing on an emulator or a rooted device, you have no means of creating such an "ABC" directory by hand.
Is there a way to programmatically determine where folders are created on internal storage?
Um, well, you are certainly welcome to examine the path in the File object that you created to point to some location (e.g., new File(getFilesDir(), "ABC")).
Generally, under what partion are folders created on internal storage in Android?
/data.
I am trying to save a file on both internal and external sd card .. basically I want to give user an option to save file on internal or external cards
This is how I am creating file in Internal SD card
File file = new File(Environment.getExternalStorageDirectory()
+ "/Tnt_input/register.html");
but how to create this file in External SD card...?
I can see two storage in DDMS
1) sdCard0
2) extSdCard
by using above code its creating this file in sdCard0
You can use context.getFilesDir() for save file in Internal Storage
File file = new File(context.getFilesDir(), filename);
String filename = "myfile";
String string = "Hello world!";
FileOutputStream outputStream;
try {
outputStream = openFileOutput(filename, Context.MODE_PRIVATE);
outputStream.write(string.getBytes());
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
Check saving a file to internal storage for more information.
Note: Your app's internal storage directory is specified by your app's package name in a special location of the Android file system. Technically, another app can read your internal files if you set the file mode to be readable.
Good Example for Save and read file from/to Internal/External storage
how to differentiate between internal and external SD card path in android?
Until Android 4.4 there was no standard way to find all external SD card memories, only one such memory was returned by Environment.getExternalStorageDirectory(). To get to the other memories programmers were parsing some linux configuration files.
Since 4.4 (API 19) there is: Context.getExternalFilesDir which:
Returns absolute paths to application-specific directories on all
external storage devices where the application can place persistent
files it owns. These files are internal to the application, and not
typically visible to the user as media.
so on erlier than 4.4 you should use Environment.getExternalStorageDirectory, and after 4.4 Context.getExternalFilesDir.
There is a good blog post explaining all of this in detail:
http://commonsware.com/blog/2014/04/08/storage-situation-external-storage.html
Finally found a working solution , but its not recomended, to get to external sd card i used hard coded path , like /storage/extSdCard/StorageTest/input but this path depends upon device , the above path works in Samsung Galaxy note series but for xperia Z its /storage/removable/sdcard1. This solution worked for me because my client use a specific device.But like this you cant create a global method which works on every device, so here is the code which worked for me
String galaxy_note = "/storage/extSdCard";
File file = new File(galaxy_note
+"/StorageTest/input");
you can also check if there is a removable sd card installed in device or no by using
Environment.isExternalStorageRemovable();