Develop Reference

Android Accessing get external directory

Now, I am working on data transmission using bluetooth. I have such problem in selecting file in SD card/ internal storage.
I am already put permission in manifest :
I am using this command to get access the file
File sdCard = Environment.getExternalStorageDirectory();
But when I am check using this command if (sdCard.canRead()) , it can't read the path.
Anyone have the solution within my problem? Thanks anyway

The Android Dev resources has a good guide on this.
Assuming you have all the correct permissions, you could be facing issues where the storage is not mounted or there is not enough space. The guide explains how to check the state of the External Storage Dir, etc.

Did you add the following line to the AndroidManifest?
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
From android SDK version 4, you need to add that line to access external storage by your app.
Some of other issues are, (Check whether phone detects the SD card)
SD Card is Not Clean
Battery Voltage
Card Slot is Squeezed
Metal Wires in the Card Slot Get Rusty and Twisted
Malware Invade SD Card
SD Card is not Formatted Properly
SD Card is Broken
The Phone Breakdown

problem solved.
The problem is related with new android SDK. We need to add additional permission.
Thanks everyone.

SQLite Database in external sdcar

i am newbie to android .
.
I have problem that how to get external storage directory.In my device it is storage/sdcard1 path.
but it is also not working.
How can I set external storage directory path to db ?
PLease help.
Any answer will be appreciated.

Before answering this question I want you know something about the android framework..
Android contains default sqlite handling options which saves database file in internal storage directory
It is good practice to use it..
But still if you want to save in custom directory follow these instructions
By default android partitions the internal storage into a partition called SD card
which can be accessed by calling frameworks Function
File Environment.getExternalStorageDirectory()
But on some devices there is an option have external memory card
If that is your case you can do that by calling java function like this
new File("/mnt/sdcard1/");

Howto detect if a folder is writable with Android Version 4.4.2 ( KITKAT )

With KITKAT 4.4.2 I get a EACCES permission denied when trying to write a file to a specific Folder. I know the new policy with Kitkat and I should use only the primary external storage path
Because a lot of users have already installed my app and stored data in different folders I like to figure out if a path is writeable or not.
I already simply tried to check this with file.canwrite(). This method returns true, even my app is not able to write to that path.
How can I detect if a directory is writeable with KITKAT?

Sorry that was a mistake from my side.
It can be detected with file.canwrite().

From my side, it can't be detected with file.canWrite().
The path of the external sdcard is /sdcard1

Accessing application Databases on my Android device(LG Optimus one p500)

I have created an android application for my Android device which stores records into sqlite databases and even the retrieval of the data from the database works correctly on my application. Now i want to access the database file located in the location as follows:
/data/data/org.project.compdroid.dash1/databases/data
where data is my database file.
This data file i want to export to my pc to keep a backup of all the records.
for this I first tried accessing it from the emulator by the command
adb pull /data/data/org.project.compdroid.dash1/databases/data [local address path]
this worked correctly for the emulator. but when i try to copy the same file from my Android phone it says permission denied. I think since I am not the root user for my phone I am not allowed to access it and I am allowed to achieve it in my emulator since I am already rooted there.
Now is there a way by which i will be able to copy the data file from my android phone without rooting it? or is rooting the only solution for my problem?
Please do suggest any other technique(if there are any) for copying the database files from an android phone to my computer.
Thanks in advance...

You can include code in your app that will copy the file from internal storage onto the sd card, since your App has full access to its own storage. See How to backup database to SD and Backing up your Android..
You could also spit out the Db as a text file which can then be imported into any DB.

parent directory of file not writable

I am getting error like this "
error:parent Directory of a file not
writable"
in android.
I've included WRITE_EXTERNAL_STORAGE permission, but it's not working.

Having that permission doesn't allow you to write anywhere.
You should get the writable path using: Environment.getExternalStorageDirectory();.

Apart from having correct permissions and a writeable path, as was already mentioned by Macarse, you might also want to check if the SDcard mounted is writable (check the Permissions tab in the FileExplorer view it should be something like d---rwxr-x).
If not then remount the SDcard(there are adb commands to do this but are risky, I think).
My usual course of action is switching off the phone and removing and then reinserting the SDcard. Sometimes just switching off the phone helps.

I'm getting this error too, only I'm trying to write to internal storage. Any ideas on how to fix the error?
Never mind. I figured it out. Data has to be written to the file streams as bytes if saving to internal storage.