将位图的大小减小到 Android 中的某个指定像素 [英] Reduce size of Bitmap to some specified pixel in Android

问题描述

我想将我的位图图像大小减小到最大 640 像素.例如，我有大小为 1200 x 1200 像素的位图图像.. 如何将其减小到 640 像素.

I would like to reduce My Bitmap image size to maximum of 640px. For example I have Bitmap image of size 1200 x 1200 px .. How can I reduce it to 640px.

推荐答案

如果传递位图 width 和 height 然后使用:

If you pass bitmap width and height then use:

public Bitmap getResizedBitmap(Bitmap image, int bitmapWidth, int bitmapHeight) {
    return Bitmap.createScaledBitmap(image, bitmapWidth, bitmapHeight, true);
}

如果您想保持位图比例不变，但将其减少到最大边长，请使用:

If you want to keep the bitmap ratio the same, but reduce it to a maximum side length, use:

public Bitmap getResizedBitmap(Bitmap image, int maxSize) {
        int width = image.getWidth();
        int height = image.getHeight();

        float bitmapRatio = (float) width / (float) height;
        if (bitmapRatio > 1) {
            width = maxSize;
            height = (int) (width / bitmapRatio);
        } else {
            height = maxSize;
            width = (int) (height * bitmapRatio);
        }

        return Bitmap.createScaledBitmap(image, width, height, true);
}

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