Android中的内存高效图像调整大小 [英] Memory efficient image resize in Android

问题描述

我正在尝试将从相机中检索到的图像的大小(大约 5-8 兆像素)缩小到一些较小的尺寸(最大的是 1024x768).我尝试了以下代码，但我始终收到 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();

看起来 OOM 发生在 createBitmap 期间.有没有更有效的内存方法来做到这一点?也许不需要我将整个原件加载到内存中的东西?

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

当您使用 BitmapFactory 解码位图时，传入一个 BitmapFactory.Options 对象并指定 inSampleSize.这是解码图像时节省内存的最佳方式.

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.

这是一个示例代码 加载图像时出现奇怪的内存不足问题到位图对象

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