在Android中创建复选框列表的不同方法

Question

Could someone please explain the different ways of making checkbox list and saving the checked option? It would be nice if you could attach examples. I am using arraylist to save input, what are the other ways?

final CharSequence[] items = {};
final ArrayList seletedItems = new ArrayList();

Answer 1

You can create a custom class for objects like,

public class entity
{
  public boolean isChecked;
  //Any other variables can also be created
}

On check box selection change the value of

entityobj[index].isChecked=true/false;

Apply a custom list adapter, in adapters getview() method you can check for isChecked value and then either check or uncheck the respective checkbox, using this your selection will persist while scrolling also.. Hope it will help...

Answer 2

Define your ListItem object to have a 'checked' field

class ListItem{
boolean isChecked=false;
}

In your list adapter's getView attach a onCheckedChangeListener to the CheckBox and change the checked state of your object. something like:

final MessageItem Message=getItem(position);
        message.setText(Message.text);
        //set data

        select.setOnCheckedChangeListener(null); //important so that when reusing the view the old listener isn't called
        select.setChecked(Message.selected);
        select.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // TODO Auto-generated method stub
                Message.selected=isChecked;
            }
        });