I’m new to android´s app development; so far I was able to create text files on my device. The problem is when I try move the file to my PC I cannot find it. After research I now know that files saved in the internal memory are only available to the app and the external storage can be use to share files, but my device (moto G 1° gen) only have internal memory.
So the question is, is there a way to share files on my smartphone with my pc.?
Typically, devices with internal memory still have a partition set aside that emulates external storage. On any Android device I've had, the internal memory is mounted to /sdcard/ and if you insert an actual sdcard, it gets mounted to /sdcard2/. Anything you save in /sdcard/ should appear in Windows explorer when plugging the device in over USB.
Alternatively, you can also use adb to retrieve files outside of the /sdcard/ partition by using the command "adb.exe pull [source file] [destination directory(optional)]"
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I have tried reading several solutions, but none of them work for me at the moment.
I want to copy the files present in the sd memory on my computer, but when
I call via adb / sdcard etc., it displays the internal memory of the device and not the SD
I am trying to create a simple text file in my android app using the code:
FileOutputStream fileout=mContext.openFileOutput("mytextfile.txt", mContext.MODE_PRIVATE);
OutputStreamWriter outputWriter=new OutputStreamWriter(fileout);
outputWriter.write(String.valueOf(executionTime));
outputWriter.close();
Log.d("write","Done writing to 'mysdfile.txt'");
and I log the different file paths as:
String absoluteFilePath=new File(".").getAbsolutePath();
String canonicalFilePath=new File(".").getCanonicalPath();
String filePath=new File(".").getPath();
Log.d("absolutepath",absoluteFilePath);
Log.d("canonicalpath",canonicalFilePath);
Log.d("path",filePath);
and in the debugger I see the file paths as:
When I click on the absolute path blue mark, it took me to the Macintosh HDD folder. The remaining two paths didn't make any sense to me.
I also checked my current directory and the file is not in there. I am trying to store the file in internal storage.
I am testing this on lollipop device.
Note: I see the file created in DDMS when the app is run on emulator, but not on device.
Where can I find the file that is created by FileOutputStream ?
Where can I find the file that is created by FileOutputStream ?
It will be on the Android device or emulator.
and I log the different file paths as
None of those are valid paths on Android.
My android device doesnt have an SD card
That's fine, as openFileOutput() has nothing to do with an an SD card on any Android device. openFileOutput() routes to internal storage.
Where can I check them on device ?
Quoting myself:
On an emulator, DDMS has the ability to browse all of internal storage, so you can access file from your app or any other app.
On a rooted device, there are recipes for allowing DDMS the same degree of freedom.
On ordinary (un-rooted) devices, DDMS has no ability to access internal storage. The piece of software on the device that DDMS talks to runs as an ordinary user account on hardware, whereas it runs with superuser privileges on an emulator. The ordinary user on hardware has no ability to get to your app’s files, any more than does any user account associated with any other app.
The recipe for getting at internal storage on hardware is to use the run-as option with adb at the command line. For example, to download a database from the primary user’s internal storage to your development machine, you might use:
adb shell 'run-as your.application.package.name cp /data/data/your.application.package.name/databases/dbname.db /sdcard
Note that:
You will need to change the destination to wherever on your device external storage is mapped to (shown here as /sdcard/, which will not work on all devices)
You may need to use cat instead of cp on older devices
But, once you run the command, the database will be copied to external storage, which you can access via DDMS, or via any conventional way to get files on and off a device via USB cable (e.g., drive letter in Windows).
I am currently making an app that needs to be able to read from and write to a USB flash drive connected via a USB OTG adapter. Is there an easy way to access this storage via standard Java.io.File APIs? This app is only going to be run on a rooted Motorola Xoom running Android 4.2.2. Any suggestions would be appreciated.
USB Drives get mounted to your device just like an SDCard does essentially*.
The mount path usually resides at:
/storage/usb0/
I have not used this on many devices other then my Droid running CyanogenMod, your device may very. You can smiply use a file manager to explore this path. The directories will still exist even if there is no mount path, so you will be able to determine the path.
When I ran on View Pad7 used sdcard/night1/9472012051_346.mp3 with success.
If I prompt for the root directory from within the app I get /mnt/sdcard/, however Prompt(IsFileExist("/mnt/sdcard/night1/9472012051_346.mp3")); returns false.
Explorer app on tablet shows path as SD Card/night1/9472012051_346.mp3
Many tablets have their own internal memory, and this is what is mounted to /mnt/sdcard (which is symlinked to by /sdcard). In these cases, any external sdcard you install is typically at /mnt/external_sd instead
I have an application that writes important data to the SDCard and encrypts it using AES, which later will be used by a desktop application. I have noticed that if I do not unmount the SDCard from the Settings menu sometimes the files don't get written at all, or are corrupted.
Is there anyway in Android 2.1 that I can unmount the SDCard programmatically? Because I'm pretty sure that from time to time the users will forget to do this, and I'll be the one fixing the problems and I really don't want this.
If this is not possible,what Linux command should I use to unmount the SDCard? Since the application will run on some tablets that have a rooted OS.
You should unmount what's using the sdcard in the proper order, for example
umount /mnt/sdcard/.android_secure
umount /mnt/sdcard
or, probably synchronizing the buffers with the filesystem would be enough
sync; sync