Android : Check If Directory Exist On Android's Sdcard
Apr 12, 2010How do I check if a directory exist on the sdcard in android?

How do I check if a directory exist on the sdcard in android?
public class DatabaseHelper extends SQLiteOpenHelper{ public DatabaseHelper(Context context, String name, CursorFactory factory, int version) { super(context, name, null, version); // TODO Auto-generated constructor stub init();}
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Data directory not exist, create now?
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I have been trying to create a directory in sdcard programatically but it always showing me directory not created.
my code is this.
CODE:....................
When I saved a file or open a dir under sdcard dir, it always complains:"Parent directory of file is not writable: /sdcard/myfile, java.io.IOException: Parent directory of file is not writable" Any idea what's wrong?
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http://android-tricks.blogspot.com/2009/01/mount-filesystem-read-write.html
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I have this code:
CODE:...............
On the marked line of file.createNewFile();
I get java.io.IOException: Parent directory of file is not writable: /sdcard/log.db
I have an sdcard installed and I can easily copy files to it. What might be wrong?
In android, is there an activity show a directory explorer to browse content of sdcard?Like a File explorer in Java, it can show the content of current directory and I can move up to its parent by clicking '..' and move down to a child directory by clicking the name of the child directory?
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View 5 Replies View RelatedAt some points while running my android application, I need to create a directory on the sd card, for a small number of users this fails and I can't figure out the reason for it... (I've found similar problems caused by the WRITE_EXTERNAL_STORAGE permission missing, it's there and it works for almost all users so I don't think this is reason) When mkdirs returns false I crash the program and log the following java.io.File properties, starting at the directory I want to create, then recursive printing properties of the parent directory and so on...
/sdcard/MyDirectory/Dir1/Dir2 (exists: false, canWrite: false, isDirectory: false, isFile: false);
/sdcard/MyDirectory/Dir1 (exists: true, canWrite: true, isDirectory: true, isFile: false);
/sdcard/MyDirectory (exists: true, canWrite: true, isDirectory: true, isFile: false);
/sdcard (exists: true, canWrite: true, isDirectory: true, isFile: false);
/ (exists: true, canWrite: false, isDirectory: true, isFile: false);
The strange thing is that the parent directory is writable (canWrite=true), I can't print the execute file permission but from what I've read, write is what you need when creating directories... What I've looked at so far is the WRITE_EXTERNAL_STORAGE permission, if the sd card is full and if the sdcard is mounted read only:...........................
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CODE:............
When the app run, i'm unable to "tick" any of the check boxes...
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the error in my logcat is such Logcat
08-29 08:20:57.961: ERROR/AndroidRuntime(1766): java.lang.RuntimeException: Unable to start activity ComponentInfo{one.two/one.two.Booking}: java.lang.IllegalArgumentException: column '_id' does not exist
08-29 08:20:57.961: ERROR/AndroidRuntime(1766): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2268)
08-29 08:20:57.961: ERROR/AndroidRuntime(1766): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2284).................
I'm having trouble with something that works in the Notepad example.
Here's the code from the NotepadCodeLab/Notepadv1Solution:
CODE:.................
This code seems to work fine. But just to be clear, I ran the adb utility and run sqlite3 I inspected the schema as follows:
CODE:...............
All seems good to me.
Now on to My App, which as far as I can see is basically the same with a few minor changes. I've simplified and simplified my code, but the problem persists.
CODE:..............
When I run my app, I get a RuntimeException and the following prints in LogCat from my Log.e() statement:
LogCat Message: java.lang.IllegalArgumentException: column '_id' does not exist
So, back to sqlite3 to see what's different about my schema:
CODE:.................
I don't see how I'm missing the '_id'.
Can anyone point out what I've done wrong?
One thing that's different between my app and the Notepad example is that I started by creating my application from scratch using the Eclipse wizard while the sample app comes already put together. Is
there some sort of environmental change I need to make for a new app to use a sqlite database?
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.....................
However, what if com.me.app.myapp is not yet installed on the device?
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