android - 为什么 BitmapFactory.decodeFile 返回 null？

Question

我的代码:

BitmapFactory.Options opt = new BitmapFactory.Options();
opt.inJustDecodeBounds = true;
Bitmap rotateBmp = BitmapFactory.decodeFile("/storage/sdcard0/FastBurstCamera/2014-09-15 05-24-07-461.jpg", opt);

文件/storage/sdcard0/FastBurstCamera/2014-09-15 05-24-07-461.jpg存在，但是rotateBmp为空，为什么？

Answer 1

The file /storage/sdcard0/FastBurstCamera/2014-09-15 05-24-07-461.jpg exists, but the rotateBmp is null, why?

因为这就是您的要求。

引用 the documentation for decodeFile() (强调):

The decoded bitmap, or null if the image data could not be decoded, or, if opts is non-null, if opts requested only the size be returned (in opts.outWidth and opts.outHeight)

引用 the documentation for inJustDecodeBounds :

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.