可绘制到byte []

Question

我有一张来自网络的图片ImageView.它非常小(一个favicon),我想将它存储在我的SQLite数据库中.我可以得到一个Drawable,mImageView.getDrawable()但后来我不知道该怎么做.我不完全理解DrawableAndroid中的类.

我知道我可以从Bitmap类似的方式获得一个字节数组:

Bitmap defaultIcon = BitmapFactory.decodeStream(in);

ByteArrayOutputStream stream = new ByteArrayOutputStream();
defaultIcon.compress(Bitmap.CompressFormat.JPEG, 100, stream);

byte[] bitmapdata = stream.toByteArray();

但是如何从一个字节数组中获取Drawable？

Answer 1

Drawable d; // the drawable (Captain Obvious, to the rescue!!!)
Bitmap bitmap = ((BitmapDrawable)d).getBitmap();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] bitmapdata = stream.toByteArray();

Answer 2

谢谢大家,这解决了我的问题.

Resources res = getResources();
Drawable drawable = res.getDrawable(R.drawable.my_pic);
Bitmap bitmap = ((BitmapDrawable)drawable).getBitmap();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] bitMapData = stream.toByteArray();

Answer 3

Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.tester);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] bitMapData = stream.toByteArray();