How to sort out a List in android..?

Question

List<PackageInfo> pkginfoList = getPackageManager()
                .getInstalledPackages(0);

How to Sort the PackageInfo, i did ApplicationInfo thats working fine

Collections.sort(installedList, new ApplicationInfo.DisplayNameComparator(packageManager));

but i want implement PackageInfo also..

i'm not sure how to do.. Please any one help me...!

Manuel Selva · Accepted Answer · 2014-03-18T08:01:55.950

Collections.sort method takes two parameters:

The list you want to sort
And a Comparator object used to compare elements which type is the type of elements in your list.

In your case you want to implement a Comparator<PackageInfo>. An example supposing a PackagInfo has a getName() method:

new Comparator<PackagInfo>() {
    @Override
    public int compare(PackagInfo arg0, PackagInfo arg1) {
      return arg0.getName().compareTo(arg1.getName());
    }
 };

Another solution is to get one from somewhere but I don't know Android well. Looking at the piece of code you provided, maybe you have a PackageInfo.xxxx static field which type is Comparator<PackageInfo> ?

score 2 · Answer 2 · answered Nov 09 '17 at 09:58

2

Since Manuel Selva's answer didn't really work for me, here's what I did to improve it - assuming you want to sort the packages according to their app's name:

Collections.sort(packages, new Comparator<PackageInfo>() {
    @Override
    public int compare(PackageInfo arg0, PackageInfo arg1) {
        CharSequence name0 = arg0.applicationInfo.loadLabel(Context.getPackageManager());
        CharSequence name1 = arg1.applicationInfo.loadLabel(Context.getPackageManager());
        if (name0 == null && name1 == null) {
            return 0;
        }
        if (name0 == null) {
            return -1;
        }
        if (name1 == null) {
            return 1;
        }
        return name0.toString().compareTo(name1.toString());
    }
});

answered Nov 09 '17 at 09:58

Yoav Feuerstein

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The comparator is using `ResolveInfo` instead of `PackageInfo` – Ampersanda Dec 04 '17 at 15:02
@Ampersanda sorry but I couldn't understand, where do you see ResolveInfo here? – Yoav Feuerstein Dec 05 '17 at 07:57
I use your code before, but the `Collections.sort()` second parameter is `Comparator< ResolveInfo >` now – Ampersanda Dec 05 '17 at 08:00
@Ampersanda what type did you use for the first parameter? see the official docs: https://developer.android.com/reference/java/util/Collections.html (look for the second sort() function) – Yoav Feuerstein Dec 05 '17 at 08:18
if statements are unnecessary – Yasiru Nayanajith Oct 15 '18 at 07:45
@YasiruNayanajith I don't remember what made me add them, but perhaps in some cases it can be null? – Yoav Feuerstein Oct 15 '18 at 07:46

score -1 · Answer 3 · edited May 23 '17 at 12:08

-1

I think what you are looking for is already answered in this post.

Did you try looking for existing posts with the solution before creating a new question ?

edited May 23 '17 at 12:08

Community

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1

answered Mar 18 '14 at 07:54

Viral Patel

32,418
18
82
110

Thanks for your reply.. ok buddy.. i searched but never get the answer thats way i posted my queries. i will look at on as your suggestion – Karthick Mar 18 '14 at 08:01

How to sort out a List in android..?

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