How to sort arrayList according to Integer size in android?

Question

I am sorting my array list int items by using "compareTo(String string);" this method comparing only string but not int values.How I can sort my array list based on integer value.

Here is my code :

 Collections.sort(mAllSpeedsArray, new AllSpeedsComparator());

public class AllSpeedsComparator implements Comparator<AllSpeeds> {

@Override
public int compare(AllSpeeds lhs, AllSpeeds rhs) {
    // TODO Auto-generated method stub      
        return lhs.getSpeed().compareTo(rhs.getSpeed());        
    }
}

Sorry, it is early. Not Collections.swap(), Collections.sort(allSpeedsArray); — zgc7009
– zgc7009, Commented May 2, 2014 at 11:28
Maybe an other possibility is to convert string to integers and then comparing them (> etc ...). To convert: int stringVal = Integer.parseInt("myString"); — smagnan
– smagnan, Commented May 2, 2014 at 11:28
possible duplicate of Converting a string to an integer on Android — josephus
– josephus, Commented May 2, 2014 at 11:39
Mix my comment with @smagnan and looks like a quick and easy to me :P — zgc7009
– zgc7009, Commented May 2, 2014 at 11:55
yes @smagnam I tried this but I am not getting exact sorting. — Android_dev
– Android_dev, Commented May 2, 2014 at 12:14

Karakuri · Accepted Answer · 2014-05-02 11:26:17Z

3

Either make your AllSpeeds data structure return an int (or double, or something else numeric) from getSpeed(), or use Integer.parse(string) on the two strings and then compare the integers.

answered May 2, 2014 at 11:26

Karakuri

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4 Comments

Android_dev Over a year ago

like this int firstSpeed = Integer.parseInt(lhs.getSpeed()); int secondSpeed = Integer.parseInt(rhs.getSpeed());

Android_dev Over a year ago

And I am comparing this 2 Inegers like this if (firstSpeed < secondSpeed) { return firstSpeed; } else { return secondSpeed; }

Android_dev Over a year ago

But it always executing else block only.

Karakuri Over a year ago

you can return firstSpeed - secondSpeed.

Wundwin Born · Accepted Answer · 2014-05-02 12:06:07Z

2

How about this

@Override
public int compare(AllSpeeds lhs, AllSpeeds rhs) {
    // TODO Auto-generated method stub      
    int a = Integer.parseInt(lhs.getSpeed());
    int b = Integer.parseInt(rhs.getSpeed());
    return a < b ? 1 : (a == b ? 0 : -1);
}

edited May 2, 2014 at 12:06

answered May 2, 2014 at 11:32

Wundwin Born

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2 Comments

Android_dev Over a year ago

that return method giving "Cannot cast from String to Integer" error.Because my getSpeed() is String type.

Android_dev Over a year ago

Update one giving "Cannot invoke compareTo(int) on the primitive type int"

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