在 Android 中使用 createScaledBitmap 创建缩放位图 [英] Creating a scaled bitmap with createScaledBitmap in Android

问题描述

我想创建一个缩放的位图，但我似乎得到了一个不成比例的图像.它看起来像一个正方形，而我想变成矩形.

I want to create a scaled bitmap, but I seemingly get a dis-proportional image. It looks like a square while I want to be rectangular.

我的代码:

Bitmap resizedBitmap = Bitmap.createScaledBitmap(myBitmap, 960, 960, false);

我希望图像的 MAX 为 960.我该怎么做?将宽度设置为 null 不会编译.这可能很简单，但我无法理解它.谢谢

I want the image to have a MAX of 960. How would I do that? Setting width to null doesn't compile. It's probably simple, but I can't wrap my head around it. Thanks

推荐答案

如果内存中已经有了原始位图，则无需进行inJustDecodeBounds、的整个过程inSampleSize 等.您只需要弄清楚要使用的比例并相应地进行缩放即可.

If you already have the original bitmap in memory, you don't need to do the whole process of inJustDecodeBounds, inSampleSize, etc. You just need to figure out what ratio to use and scale accordingly.

final int maxSize = 960;
int outWidth;
int outHeight;
int inWidth = myBitmap.getWidth();
int inHeight = myBitmap.getHeight();
if(inWidth > inHeight){
    outWidth = maxSize;
    outHeight = (inHeight * maxSize) / inWidth; 
} else {
    outHeight = maxSize;
    outWidth = (inWidth * maxSize) / inHeight; 
}

Bitmap resizedBitmap = Bitmap.createScaledBitmap(myBitmap, outWidth, outHeight, false);

如果此图像的唯一用途是缩放版本，则最好使用 Tobiel 的答案，以最大限度地减少内存使用.

If the only use for this image is a scaled version, you're better off using Tobiel's answer, to minimize memory usage.

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