How to reorder the list on Android?

Question

I am developing in Android, I am reading a file from a folder and putting it in a list.

The list has two meanings: 1.Name 2.Time

It can display the list as the following code:

 for(int i=0;i<fileList.size();i++){
        Log.i("DownloadFileListTask", "file mName("+i+") = " + fileList.get(i).mName);
        Log.i("DownloadFileListTask", "file mTime("+i+") = " + fileList.get(i).mTime);
 }

And the log is as follows:

file mName(0) = /DCIM/100__DSC/MOV_0093.LG1
file mTime(0) = 2015-04-15 14:47:46
file mName(1) = /DCIM/100__DSC/PICT0094.JPG
file mTime(1) = 2015-04-15 14:47:52
file mName(2) = /DCIM/100__DSC/MOV_0095.LG1
file mTime(2) = 2015-04-15 14:48:04
file mName(3) = /DCIM/100__DSC/MOV_0096.LG1
file mTime(3) = 2015-04-15 14:48:12
file mName(4) = /DCIM/100__DSC/MOV_0097.LG1
file mTime(4) = 2015-04-15 14:48:20
file mName(5) = /DCIM/100__DSC/MOV_0098.LG1
file mTime(5) = 2015-04-15 14:50:26

From the magazine early time is at the first facility. But I want to change his order.

How to reorder the list on Android?

Answer 1

Use Collections.reverse :

List myOrderedList = new List(); // any implementation
Collections.reverse(myOrderedList);
// now the list is in reverse order

In addition, if you are the one who adds items to the list, you can add new items at the top of the list, so you won’t have to change it later:

List<Integer> myOrderedList = new List<>(); // any implementation
myOrderedList.add(1); // adds the element at the end of the list
myOrderedList.add(0, 2); // adds the element (2) at the index (0)
myOrderedList.add(0, 3); // adds the element (3) at the index (0)
// the list is: [3, 2, 1]

Answer 2

ArrayList Hashmap, , . Collections.reverse(), .