可绘制到字节[] [英] Drawable to byte[]

问题描述

我在 ImageView 中有一张来自网络的图像.它非常小(一个图标)，我想将它存储在我的 SQLite 数据库中.我可以从 mImageView.getDrawable() 得到一个 Drawable 但是我不知道接下来要做什么.我不完全理解 Android 中的 Drawable 类.

I have an image from the web in an ImageView. It is very small (a favicon) and I'd like to store it in my SQLite database. I can get a Drawable from mImageView.getDrawable() but then I don't know what to do next. I don't fully understand the Drawable class in Android.

我知道我可以从 Bitmap 获取一个字节数组，例如:

I know I can get a byte array from a Bitmap like:

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 Drawable 获取字节数组?

But how do I get a byte array from a Drawable?

推荐答案

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();

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