如何将图像(位图)调整为给定大小? [英] How to resize image (Bitmap) to a given size?

问题描述

如何以编程方式将图像(位图)调整为例如 800*480?我在我的应用程序中检索到了一张大约 1MB 的图片，我需要将其缩小到 800*480我已经加载了那张图片并对其进行了压缩，但是我该如何使它变小:

How to resize image (Bitmap) to for example 800*480 programatically ? I have retrieved a picture in my app which is ~1MB and I need to scale it down to 800*480 I have loaded that picture and compressed it but how do I do to make it smaller :

ByteArrayOutputStream bos = new ByteArrayOutputStream(8192);
photo.compress(CompressFormat.JPEG, 25, bos); 

推荐答案

Bitmap scaledBitmap = scaleDown(realImage, MAX_IMAGE_SIZE, true);

缩小方法:

public static Bitmap scaleDown(Bitmap realImage, float maxImageSize,
        boolean filter) {
    float ratio = Math.min(
            (float) maxImageSize / realImage.getWidth(),
            (float) maxImageSize / realImage.getHeight());
    int width = Math.round((float) ratio * realImage.getWidth());
    int height = Math.round((float) ratio * realImage.getHeight());

    Bitmap newBitmap = Bitmap.createScaledBitmap(realImage, width,
            height, filter);
    return newBitmap;
}

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