Sort array of File[] based on file.lastModified

Question

I have a array of files.

File[] toSort = videoFiles.listFiles();

I need to sort them based on lastModified. How do I achieve it in Android.

score 2 · Answer 1 · answered Jun 05 '15 at 13:36

2

Try something like:

File[] toSort = videoFiles.listFiles();

Arrays.sort(toSort, new Comparator<File>(){
    public int compare(File f1, File f2) {
         return Long.valueOf(f1.lastModified()).compareTo(f2.lastModified());
    } 
});

answered Jun 05 '15 at 13:36

SMA

36,381
8
49
73

Can you explain how I should assign it to my new Array ? I mean File[] sortedArray = ? – Kalai Arasi Jun 05 '15 at 13:40
you don't need to assign it to anything. The original array object will be sorted. https://docs.oracle.com/javase/7/docs/api/java/util/Arrays.html#sort(java.lang.Object[]) – Bobby Jun 05 '15 at 13:44
there is no difference after doing it – Kalai Arasi Jun 05 '15 at 14:01

score 0 · Answer 2 · answered Jun 05 '15 at 13:46

0

You need a Comparator that sorts the way you want:

public class LastModifiedComparator implements Comparator<File> {
    @Override
    public int compare(File f1, File f2) {
        return Long.compare(f1.lastModified(), f2.lastModified());
    }
}

Then you could use Arrays.sort(T[], Comparator)

LastModifiedComparator comp = new LastModifiedComparator();
Arrays.sort(toSort, comp);

answered Jun 05 '15 at 13:46

dosw

431
2
10

this is from API19 only. I use API 16 as min – Kalai Arasi Jun 05 '15 at 14:01

Sort array of File[] based on file.lastModified

2 Answers2