android BitMap、Drawable、inputStream及byte[] 互转

1. Bitmap转换为inputStream
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
InputStream isBm = new ByteArrayInputStream(baos .toByteArray());

2. BitMap转换为byte[]
Bitmap bitmap = BitmapFactory.decodeStream(in);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] bitmapdata = stream.toByteArray();

3. Drawable转换为byte[]
Drawable d;
Bitmap bitmap = ((BitmapDrawable)d).getBitmap();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
defaultIcon.compress(Bitmap.CompressFormat.JPEG, 100, bitmap);
byte[] bitmapdata = stream.toByteArray();

4. byte[]转换为Bitmap ：
Bitmap bitmap =BitmapFactory.decodeByteArray(byte[], 0,byte[].length);