在android中调整网络图像的大小？

Question

I'm trying to adapt the code in google developer guides to resize a large image obtained from HTTP. In order to resize the image, I have to process it once (using Bitmapfactory.decodeStream) to determine its original height and width. Then, I have to run Bitmapfactory.decodeStream again in order to resize it. THe problem with this approach is that I cannot use the same stream twice. If I do, the second called to decodeStream returns null.

I thought about trying to clone / copy the stream first so that I would have two copies to work with. However, this uses up memory, which was the problem I was trying to solve by resize the image, in the first place.

Answer 1

Just use the Bitmap returned by Bitmapfactory.decodeStream() for the resize operation. You do not need to decode it twice. You have it already.

Bitmap b = Bitmapfactory.decodeStream(/* your InputStream */);
// get original dimensions from b
int h = b.getHeight();
int w = b.getWidth();
// resize b to half (actually quarter) size
Bitmap resizedBitmap = Bitmap.createScaledBitmap(b, w/2, h/2, false);