CODEWITHSUNDEEP
androidarraylist
anddev
anddev

Reputation: 3204

How to check arraylist contains this particular word in android?

I have ArrayList<String> in that I added 3-4 website names. Like, http://www.google.com, https://www.stackoverflow.com, etc. Now in my application if I type simply "google" then I want to compare that "google" word with the ArrayList<String>.

I am stuck here. Can anyone tell me how can I compare the string with the array object?

Thanks in advance.

Upvotes: 6

Views: 26443

Answers (4)

Pankaj Kumar
Pankaj Kumar

Reputation: 83008

To do so, you need to override implementation of contains(). I am giving you a simple example.

Custom ArrayList class

public class MyArrayList extends ArrayList<String> {
    private static final long serialVersionUID = 2178228925760279677L;

    @Override
    public boolean contains(Object o) {
        return indexOf(o) >= 0;
    }

    @Override
    public int indexOf(Object o) {
        int size = this.size(); 
        if (o == null) {
            for (int i = 0; i < size ; i++) {
                if (this.get(i) == null) {
                    return i; 
                }
            }
        } else {
           for (int i = 0; i < size ; i++) {
                if (this.get(i).contains(String.valueOf(o))) {
                    return i; 
                }
            }
        }
        return -1;
    }
}

How to use 

MyArrayList arrayList = new MyArrayList(); 
arrayList.add("http://www.google.com");
arrayList.add("https://www.stackoverflow.com");
arrayList.add("http://pankajchunchun.wordpress.com");

if (arrayList.contains("google")) {
    System.out.println("ArrayList Contains google word");
}

if (arrayList.contains("igoogle")) {
    System.out.println("ArrayList Contains igoogle word");
} else {
    System.out.println("ArrayList does not Contains igoogle word");
}

Below is output for above code example

ArrayList Contains google word
ArrayList does not Contains igoogle word

See ArrayList Source Code for more custom implementation.

Upvotes: 5

Apoorv
Apoorv

Reputation: 13520

You can iterate through your ArrayList<String> like

public String getWebsiteName(String toMatchString)
{
    ArrayList<String> yourArrayList = new ArrayList<String>();

    for (String webSiteName : yourArrayList)
    {
        if (webSiteName.contains(toMatchString))
            return webSiteName;
    }
    return null;
}

and get the matching String

Upvotes: 1

FD_
FD_

Reputation: 12919

Use a helper function like this 

public static boolean containsSubString(ArrayList<String> stringArray, String substring){
    for (String string : stringArray){
        if (string.contains(substring)) return true;
    }
    return false;
}

Upvotes: 0

Blackbelt
Blackbelt

Reputation: 157457

ArrayList.contains() test the the String through equals. From the documentation:

public boolean contains(Object o) Returns true if this list contains the specified element. More formally, returns true if and only if this list contains at least one element e such that (o==null ? e==null : o.equals(e)).

example:

boolean contains = yourArrayListInstance.contains(yourString);

Edit. If you want to check for substring you have to loop on the ArrayList's content and call String.contains

Upvotes: 4

Related Questions