unable to create directory in external storage

Question

I wanted to the application to create a new directory to store downloaded image inside sdcard. I tried a few methods but still I can't seems to get it work. I included permission for External Storage in android manifest as well. Any comments will be appreciated.

        Bitmap bm = null;
        InputStream in;
            in = new java.net.URL("http://blogs.computerworld.com/sites/computerworld.com/files/u177/google-nexus-4.jpg").openStream();
            bm = BitmapFactory.decodeStream(new PatchInputStream(in));
            File file = new File(Environment.getExternalStorageDirectory() + "/map");
            file.mkdirs();
            File outputFile = new File(file, "Image"+NumIncrease);
            FileOutputStream fos = new FileOutputStream(outputFile);

Below is what I get from running this.

12-05 15:55:25.566: D/skia(4244): ---- read threw an exception
12-05 15:55:25.585: D/skia(4244): ---- read threw an exception
12-05 15:55:25.585: W/System.err(4244): java.io.IOException: Is a directory
12-05 15:55:25.585: W/System.err(4244):     at org.apache.harmony.luni.platform.OSFileSystem.read(Native Method)
12-05 15:55:25.585: W/System.err(4244):     at dalvik.system.BlockGuard$WrappedFileSystem.read(BlockGuard.java:165)
12-05 15:55:25.585: W/System.err(4244):     at java.io.FileInputStream.read(FileInputStream.java:290)
12-05 15:55:25.585: W/System.err(4244):     at java.io.BufferedInputStream.fillbuf(BufferedInputStream.java:166)
12-05 15:55:25.863: E/MediaStore(4244): Failed to create thumbnail, removing original

EDIT Below is how I handle the bitmap.

bm.compress(Bitmap.CompressFormat.JPEG, 85, fos);

what about extension (.jpg, .bmp)? – Mohammed Azharuddin Shaikh Dec 05 '12 at 08:00 — Mohammed Azharuddin Shaikh, Dec 05 '12 at 08:00
look at my answer http://stackoverflow.com/a/7887114/964741 – RajaReddy PolamReddy Dec 05 '12 at 08:01 — RajaReddy PolamReddy, Dec 05 '12 at 08:01
can we see how do you write down the bitmap? – Blackbelt Dec 05 '12 at 08:18 — Blackbelt, Dec 05 '12 at 08:18

score 0 · Answer 1 · edited May 23 '17 at 11:45

Following points may help you

Probably exception is thrown because there is no MediaCard subdir. You should check if all dirs in the path exist.
Add the permissions in the manifest for this to work..
You should never use "/sdcard/" as a constant, because manufacturers may decide to mount the SD-Card to another path. Always use Environment.getExternalStorageDirectory(); instead.

unable to create directory in external storage

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