android - 在不加载到内存的情况下获取位图宽度和高度

Question

我是 android 的新手，所以我想知道有什么方法可以在不将位图加载到内存的情况下获取位图的尺寸。？？

Answer 1

您可以使用 inJustDecodeBounds 设置 BitmapFactory.Options 来获取图像的宽度和高度，而无需将位图像素加载到内存中

BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
bitmapOptions.inJustDecodeBounds = true;
BitmapFactory.decodeStream(inputStream, null, bitmapOptions);
int imageWidth = bitmapOptions.outWidth;
int imageHeight = bitmapOptions.outHeight;
inputStream.close();

更多详情:

public boolean inJustDecodeBounds

Since: API Level 1 If set to true, the decoder will return null (no bitmap), but the out... fields will still be set, allowing the caller to query the bitmap without having to allocate the memory for its pixels.

http://developer.android.com/reference/android/graphics/BitmapFactory.Options.html#inJustDecodeBounds