You can use the Base64 Android class:
String encodedImage = Base64.encodeToString(byteArrayImage, Base64.DEFAULT);

You'll have to convert your image into a byte array though. Here's an example:
Bitmap bm = BitmapFactory.decodeFile("/path/to/image.jpg"); ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); //bm is the bitmap object byte[] b = baos.toByteArray();

You can use the Base64 Android class: String encodedImage = Base64.encodeToString(byteArrayImage, Base64.DEFAULT); You'll have to convert your image into a byte array though. Here's an example: Bitmap bm = BitmapFactory.decodeFile("/path/to/image.jpg"); ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); //bm is the bitmap object byte[] b = baos.toByteArray();