内存有效的图像调整大小的Android [英] Memory efficient image resize in Android
问题描述
我想，以减少检索的形式摄像头（SO〜5-8万像素）下降到一节AA几个更小的尺寸（最大的是1024×768）图像的大小。我尝试以下code，但我一直得到一个的OutOfMemoryError 。
I am trying to reduce the size of images retrieved form the camera (so ~5-8 mega pixels) down to one a a few smaller sizes (the largest being 1024x768). I Tried the following code but I consistently get an OutOfMemoryError.
Bitmap image = BitmapFactory.decodeStream(this.image, null, opt);
int imgWidth = image.getWidth();
int imgHeight = image.getHeight();
// Constrain to given size but keep aspect ratio
float scaleFactor = Math.min(((float) width) / imgWidth, ((float) height) / imgHeight);
Matrix scale = new Matrix();
scale.postScale(scaleFactor, scaleFactor);
final Bitmap scaledImage = Bitmap.createBitmap(image, 0, 0, imgWidth, imgHeight, scale, false);
image.recycle();
它看起来像OOM在 createBitmap 发生。是否有更多的内存高效的方法来做到这一点？也许一些不要求我整个原始加载到内存中？
It looks like the OOM happens during the createBitmap. Is there a more memory efficient way to do this? Perhaps something that doesn't require me to load the entire original into memory?
推荐答案
在您下与该BitmapFactory位图德$ C $，传递一个BitmapFactory.Options对象，并指定inSampleSize。这是当对图像进行解码，以节省存储器的最佳方式。
When you decode the bitmap with the BitmapFactory, pass in a BitmapFactory.Options object and specify inSampleSize. This is the best way to save memory when decoding an image.
下面是一个示例code <一个href="http://stackoverflow.com/questions/477572/android-strange-out-of-memory-issue/823966#823966">http://stackoverflow.com/questions/477572/android-strange-out-of-memory-issue/823966#823966
Here's a sample code http://stackoverflow.com/questions/477572/android-strange-out-of-memory-issue/823966#823966
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