BitMap、Drawable、inputStream及byte[] 互转

（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);