Question

I am working on android project. I have 3 pages in which each page contains some decription and below the desciption 5 to 8 checkboxes. I kept the next button at the top of each page. I am storing the selected check box id’s in an arraylist. i.e if I check the checkbox the id will be stored in the arraylist and if I uncheck the checkbox the id will be deleted from the arraylist. (I need the selected checkboxes fo further pages and hence this task). If none of the checkbox is selected and next button is clicked i want to display an alert saying that “Please select atleast one”. How to check if none of the checkbox is selected and how to display an alert box? Please help me with this issue.

Thanks in advance

Answer 1

Loop through your ArrayList of IDs and check if each box is checked.

boolean isChecked = false;
for (int id : yourArrayOfIds) {
    if (((CheckBox) findViewById(id)).isChecked()) {
        isChecked = true;
        break;
    }
}
// If isChecked==true, a box is checked.

You may also want to check if the CheckBox object is null before using isChecked(). This is just a rudimentary example.

To show your alert, use something like this. There are lots of other tutorials and documentation as well.