BitMap、Drawable、inputStream及byte[] 互轉

（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);

(5) inputstream   to   bitmap

Bitmap bitmap = BitmapFactory.decodeStream(is);