1、 BitMap to
inputStream：
ByteArrayOutputStream baos =
new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
InputStream isBm = new ByteArrayInputStream(baos
.toByteArray());
2、BitMap to
byte[]：
Bitmap defaultIcon =
BitmapFactory.decodeStream(in);
ByteArrayOutputStream stream = new
ByteArrayOutputStream();
defaultIcon.compress(Bitmap.CompressFormat.JPEG, 100,
stream);
byte[] bitmapdata =
stream.toByteArray();
3、Drawable to
byte[]：
Drawable d; // the drawable
(Captain Obvious, to the rescue!!!)
Bitmap
bitmap = ((BitmapDrawable)d).getBitmap();
ByteArrayOutputStream stream = new
ByteArrayOutputStream();
defaultIcon.compress(Bitmap.CompressFormat.JPEG, 100,
bitmap);
byte[] bitmapdata =
stream.toByteArray();
4、byte[] to Bitmap
：
Bitmap bitmap
=BitmapFactory.decodeByteArray(byte[], 0,byte[].length);
BitMap、Drawable、inputStream及byte[] 互转
原文：http://www.cnblogs.com/zhangping/p/3513847.html