CODEWITHSUNDEEP
javaandroid
user3061048
user3061048

Reputation: 99

ArrayList filter based on some condition in android

I have an ArrayList in android which contains several names. Suppose user typed R, so I want to calculate how many names are there in the ArrayList which starts with R. for example if arraylist contains Ashok, Bimal, Ram, Raju, sunita then it should return 2 as there are 2 names starts with R

Upvotes: 3

Views: 24502

Answers (5)

suresh
suresh

Reputation: 414

Try below code....

enter code here
List<String> list = new ArrayList<String>();
list.add("How are you");
list.add("How you doing");
list.add("Joe");
list.add("Mike");

 Collection<String> filtered = Collections2.filter(list,
Predicates.containsPattern("How"));
 print(filtered);

Upvotes: -2

DroidDev
DroidDev

Reputation: 1525

In your onCreate method

int countToShow=counterMethod(character);
TextView  showCount=(TextView)findViewById(idOfYourTextView);
showCount.setText(String.valueOf(count));

Make another method in your activity as follow:-

public int counterMethod(String character){
    int count=0;
    for(int i=0; i<arrayListName.size();i++)
    {
        String name=arrayListName.get[i];
        if(name.startswith(character))
            count++;
    }
return count;
}

Upvotes: 0

Gaurav Gupta
Gaurav Gupta

Reputation: 4701

    ArrayList<String> list = new ArrayList<String>();
    list.add("Ashok");
    list.add("Bimal");
    list.add("Ram");
    list.add("Raju");
    list.add("sunita");
    int count  = 0;
    for(String s: list){
        if(s.startsWith("R")){
            count++;
        }
    }
    System.out.println(count);

Upvotes: 0

user543
user543

Reputation: 3633

    int count = 0;
    ArrayList<String> _list;//ur arraylist with names
    for (String names : _list) {
        if (names.startsWith("R")) {
            count++;
        }

    }
    System.out.println(count);

Upvotes: 7

doorstuck
doorstuck

Reputation: 2308

Iterate through the ArrayList and increment an integer variable when your check returns true.

Upvotes: 4

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