Android-Droid Android-Droid - 15 days ago 12
Android Question

Android saving file to external storage

I have a little issue with creating a directory and saving a file to it on my android application. I'm using this piece of code to do this :

String filename = "MyApp/MediaTag/MediaTag-"+objectId+".png";
File file = new File(Environment.getExternalStorageDirectory(), filename);
FileOutputStream fos;

fos = new FileOutputStream(file);
fos.write(mediaTagBuffer);
fos.flush();
fos.close();


But it's throwing an exception :


java.io.FileNotFoundException: /mnt/sdcard/MyApp/MediaCard/MediaCard-0.png (No such file or directory)


on that line :
fos = new FileOutputStream(file);


If I set the filename to :
"MyApp/MediaTag-"+objectId+"
it's working, but If I try to create and save the file to an another directory it's throwing the exception. So any ideas what I'm doing wrong?

And another question: Is there any way to make my files private in external storage so user can't see them in gallery, only if he connect his device as
Disk Drive
?

Answer

Use this function to save your bitmap in SD card

private void SaveImage(Bitmap finalBitmap) {

    String root = Environment.getExternalStorageDirectory().toString();
    File myDir = new File(root + "/saved_images");    
    myDir.mkdirs();
    Random generator = new Random();
    int n = 10000;
    n = generator.nextInt(n);
    String fname = "Image-"+ n +".jpg";
    File file = new File (myDir, fname);
    if (file.exists ()) file.delete (); 
    try {
           FileOutputStream out = new FileOutputStream(file);
           finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
           out.flush();
           out.close();

    } catch (Exception e) {
           e.printStackTrace();
    }
}

and add this in manifest

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 

EDIT: By using this line you can able to see saved images in the gallery view.

sendBroadcast(new Intent(
Intent.ACTION_MEDIA_MOUNTED,
            Uri.parse("file://" + Environment.getExternalStorageDirectory())));

look at this link also http://rajareddypolam.wordpress.com/?p=3&preview=true

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