How to select/deselect all checkBox?

Question

I have an adapter with an imageview,a textView and a Checkbox and a button \"Select all\" for selecting all the checkbox. I searched a lot about how can I do this (select al

Answer 1

boolean flag = true;

Now on your button click swap the value of flag

flag = !flag;
adapter.notifydatasetchanged();

Now in your getView method

public View getView(int position, View convertView, ViewGroup parent) {
    View vi = convertView;
    ViewHolder holder;
    if (convertView == null) {
        vi = inflater.inflate(R.layout.item, null);
        holder = new ViewHolder();
        holder.text = (TextView) vi.findViewById(R.id.text);
        holder.image = (ImageView) vi.findViewById(R.id.image);
        holder.ck = (CheckBox) vi.findViewById(R.id.chkbox);
        vi.setTag(holder);
    } else {
        holder = (ViewHolder) vi.getTag();
    }
    holder.ck.setChecked(flag);
    holder.text.setText(nume[position]);
    holder.image.setTag(data[position]);
    imageLoader.DisplayImage(data[position], activity, holder.image);
    return vi;
}