anddev anddev - 10 days ago 5
Android Question

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.

Answer

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.