how to limit checkbox selection in listview?

Question

friends,

i want to limit checkbox selection in android listivew to for example only 3 checkboxes should be selected otherwise it should give error message.

u

Answer 1

int globalInc = 0;
boolean isCheckGlobal = false;

ArrayList checkings = new ArrayList();

@Override
public View getView(final int position, View convertView, ViewGroup parent) {

    ViewHolder viewHolder = null;
    if (convertView == null) {
        LayoutInflater inflator = context.getLayoutInflater();
        convertView = inflator.inflate(R.layout.list_inner, null);
        viewHolder = new ViewHolder();
        viewHolder.friendName = (TextView) convertView
                .findViewById(R.id.friendName);

        viewHolder.checkbox = (CheckBox) convertView
                .findViewById(R.id.checkbox);

        final MyAdapterSecond objectMyAdapter = new MyAdapterSecond();

        viewHolder.checkbox.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                int getPositionInClick = (Integer) v.getTag();


                if (isCheckGlobal == false) {
                    if (checkings.contains(getPositionInClick)) {
                        globalInc--;
                        checkings.remove(checkings.indexOf(getPositionInClick));
                                                } else {
                        objectMyAdapter.getCheck(false);
                    }
                } else if (isCheckGlobal == true) {
                                            if (checkings.size() < 4) {
                        globalInc++;
                    }

                }
            }
        });

        viewHolder.checkbox
                .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

                    @Override
                    public void onCheckedChanged(CompoundButton buttonView,
                            boolean isChecked) {
                        int getPosition = (Integer) buttonView.getTag();



                        list.get(getPosition).setSelected(
                                buttonView.isChecked());                            

                        callCheck(buttonView, "hi1");
                        if (checkings.size() > 4                            {
                            Toast.makeText(context, "Error = " + globalInc,
                                    Toast.LENGTH_LONG).show();
                                                            objectMyAdapter.setCheck(buttonView);
                            isCheckGlobal = false;


                        } else {
                            buttonView.setSelected(isChecked);
                            if (isChecked
                                    && (!checkings.contains(getPosition))) {
                                checkings.add(getPosition);
                                                                }
                            else if(!isChecked){
                                if(checkings.contains(getPosition)){
                                    checkings.remove(checkings.indexOf(getPosition));
                                }
                            }
                            isCheckGlobal = true;
                                                        }

                    }
                });
        convertView.setTag(viewHolder);
        convertView.setTag(R.id.friendName, viewHolder.friendName);

        convertView.setTag(R.id.checkbox, viewHolder.checkbox);
    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }
    viewHolder.checkbox.setTag(position); // This line is important.

    viewHolder.friendName.setText(list.get(position).getname());

            viewHolder.checkbox.setChecked(list.get(position).isSelected());

    return convertView;

 }


 class MyAdapterSecond {
    CompoundButton buttonView;

    public void setCheck(CompoundButton buttonView) {
        this.buttonView = buttonView;
    }

    public void getCheck(boolean flag) {
        this.buttonView.setChecked(flag);
    }
}