Android saving file to external storage

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");         if (!myDir.exists()) {                    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 will be 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

The code presented by RajaReddy no longer works for KitKat

This one does (2 changes):

private void saveImageToExternalStorage(Bitmap finalBitmap) {    String root = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).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();    }    // Tell the media scanner about the new file so that it is    // immediately available to the user.    MediaScannerConnection.scanFile(this, new String[] { file.toString() }, null,            new MediaScannerConnection.OnScanCompletedListener() {                public void onScanCompleted(String path, Uri uri) {                    Log.i("ExternalStorage", "Scanned " + path + ":");                    Log.i("ExternalStorage", "-> uri=" + uri);                }    });}

Update 2018, SDK >= 23.

Now you should also check if the user has granted permission to external storage by using:

public boolean isStoragePermissionGranted() {    String TAG = "Storage Permission";    if (Build.VERSION.SDK_INT >= 23) {        if (this.checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)                == PackageManager.PERMISSION_GRANTED) {            Log.v(TAG, "Permission is granted");            return true;        } else {            Log.v(TAG, "Permission is revoked");            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);            return false;        }    }    else { //permission is automatically granted on sdk<23 upon installation        Log.v(TAG,"Permission is granted");        return true;    }}public void saveImageBitmap(Bitmap image_bitmap, String image_name) {    String root = Environment.getExternalStorageDirectory().toString();    if (isStoragePermissionGranted()) { // check or ask permission        File myDir = new File(root, "/saved_images");        if (!myDir.exists()) {            myDir.mkdirs();        }        String fname = "Image-" + image_name + ".jpg";        File file = new File(myDir, fname);        if (file.exists()) {            file.delete();        }        try {            file.createNewFile(); // if file already exists will do nothing            FileOutputStream out = new FileOutputStream(file);            image_bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);            out.flush();            out.close();        } catch (Exception e) {            e.printStackTrace();        }        MediaScannerConnection.scanFile(this, new String[]{file.toString()}, new String[]{file.getName()}, null);    }}

and of course, add in the AndroidManifest.xml:

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