Is it possible to send SD (Secure Digital) commands from Android app to SD card ?
Commands are read SD card, write to SD card etc (CMD18, CMD24).
The constraint is the phone should NOT be a rooted phone. With rooted phone we are able to send SD commands but not with unrooted phone. On attempting we get the error "permission denied".
Any help is greatly appreciated.
Thanks
It is not possible. The SD card hardware is abstracted away and mounted as a directory in the filesystem. Why would you want to send raw commands to the SD card anyway? Why not just read and write files on it?
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is it possible for my app to do one or more of the following: read, write and detect data changes to phone storage while the phone is connected to the pc?
Note: The app is used on Android 4.1 and up
When SD card is connected to your pc your phone cannot read the sd card. So, naturally your app wont b able to read the SD card and detect changes as long as SD card is being read by your pc.
But once you disconnect the SD from your pc, you can detect any change in the SD card by comparing with the previous status of the sd card which u have to save for future comparisons!
Is it possible to send SD commands from Android app to SD card ? Commands are read SD card, write to SD card etc (CMD18, CMD24).
Even for the rooted phones..
I think he is doing this in
Sending SD commands from Android app
Any help is greatly appreciated.
Thanks
I have an android device which doesn't have an SD Card (It says "Insert SD Card" in Settings -> Storage.
But when i list the files in adb shell, it has a folder named /sdcard in it and it has files in it too.
I thought that it might be an emulates sdcard location coming from /storage/sdcard0. But the contents of the two folders are different. Can anyone help me understand this concept please? Couldn't find much by Googling.
I am developing an application that needs to write files to the SD card. I am using GetExternalStoragePublicDirectory() to determine the directory to write to.
I have two phones I am developing with. On a Google Nexus S, running Android 4.0.4 (Ice cream sandwich) it is returning a directory on the SD card. However, on a Samsung Exhibit 2 running Android 2.3.5, it is writing directly to the USB storage on the phone.
Is there a way to force the SD card?
edit:
I found that getExternalStoragePublicDirectory(), and getExternalStorageDirectory() are always returning "/mnt/sdcard/". This is not actually the mount location for the sd card. On the Samsung Exhibit 2, this is the USB storage location. The card mount location is "/mnt/sdcard/external_sd". Is there a way to return this actual sd location?
I see that the camera and other apps have found a way to do it. The camera app has a "storage" setting with options "phone" and "memory card". If "memory card" is specified, images are actually stored on the sd card.
Is there a way to return this actual sd location?
No, sorry, not in the current Android SDK.
I see that the camera and other apps have found a way to do it.
Mostly, they will either be ones written by the device manufacturer, or are reading information via MediaStore, which should index both sources.
If you want to write to SD card only use
File mySdCardPath = Environment.getExternalStorageDirectory();
File dir = new File (mySdCardPath.getAbsolutePath() + "/yourDirectoryName");
I am trying to add ringtones to the media/ringtones folder from my application. If the phone is connected via USB to a computer or mounted on my Mac, the ringtones do not show up in the SD Card, nor in the Ringtone settings.
But if I run the application with the USB unplugged, the ringtones appear ok. This is not a problem with Ringdroid which does the same thing.
Can someone please tell me what could be wrong.
Did you check the setting for usb mass storage? It should be off if you want to access the content of the sd card from the phone.
If you mount the SDCard on your Mac, your Phone can´t acces it.
So, if you want to use the SDCard on your phone, it has to be mounted there (and nowhere else).