android如何实现相册时光轴？

Question

现在要实现扫描手机拍摄的所有照片，然后按照时间进行排序，实现时光轴效果，请问如何实现？

Answer 1

1. Simply sort by the modification time of the photo files, file.lastModified()get the last modification time of the file, and then compare;
2. Accurately obtain the time, the photos have EXIF ​​information, which includes the photo shooting time, location coordinates, aperture, Equipment, etc., time acquisition example

ExifInterface exif = new ExifInterface(path);
String date = exif.getAttribute(ExifInterface.TAG_DATETIME);

For more information, just pass different TAGs. Please refer to the ExifInterface TAG definition for details.

Answer 2

Some photos do not have exif information, and reading from exif is not complete enough
Read the last modification time of the file directly from the database