Only select only one radio button from listview

Question

I have searched the question over and over, there are many questions I have found in stackoverflow but I did not come up with a solution. Here is my problem. I have a list of item in a linearlayout like this:

When the screen comes first, the last radion button is selected automatically. But if I select another radio button, the last radio button is already in selected state. I want to select only one radion button but at the same time when the screen comes first the last radio button will be auto selected and other automatically will not be selected. How can I achieve this. My adapter class is :

public class AdapterPaymentMethod extends ArrayAdapter<PaymentData> {
    private Context context;
    private boolean userSelected = false;
    ViewHolder holder;

    public AdapterPaymentMethod(Context context, int resource,
            List<PaymentData> items) {
        super(context, resource, items);
        this.context = context;
    }

    /* private view holder class */
    private class ViewHolder {
        RadioButton radioBtn;
        Button btPaymentMethod;
        // ImageView ivLine;
    }

    public View getView(final int position, View convertView, ViewGroup parent) {
        holder = null;
        PaymentData rowItem = getItem(position);
        LayoutInflater mInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        if (convertView == null) {
            convertView = mInflater.inflate(
                    com.android.paypal.homeactivity.R.layout.list_item, null);
            holder = new ViewHolder();
            holder.radioBtn = (RadioButton) convertView
                    .findViewById(com.android.paypal.homeactivity.R.id.rdb_payment_method);
            holder.btPaymentMethod = (Button) convertView
                    .findViewById(com.android.paypal.homeactivity.R.id.bt_item_event);
            convertView.setTag(holder);
        } else
            holder = (ViewHolder) convertView.getTag();

        if(position==getCount()-1 && userSelected==false){
            holder.radioBtn.setChecked(true);
        Log.d("if position", ""+position);
        }
        else{
            holder.radioBtn.setChecked(false);
            Log.d("else position", ""+position);
        }

        holder.radioBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                userSelected=true;
                if(getCount()-1==position&&userSelected==true){         
                }
                else if(getCount()-2==position&&userSelected==true)
                {
                    holder.radioBtn.setChecked(true);
                }
            }
        });



        holder.radioBtn.setText(rowItem.getRdbText());
        holder.btPaymentMethod.setText(rowItem.getBtText());
        return convertView;
    }
}

Solution 1

Keep the currently checked RadioButton in a variable in your Activity. In the OnClickListener of your RadioButtons do this:

// checks if we already have a checked radiobutton. If we don't, we can assume that 
// the user clicked the current one to check it, so we can remember it.
if(mCurrentlyCheckedRB == null) 
    mCurrentlyCheckedRB = (RadioButton) v;
    mCurrentlyCheckedRB.setChecked(true);
}

// If the user clicks on a RadioButton that we've already stored as being checked, we 
// don't want to do anything.       
if(mCurrentlyCheckedRB == v)
    return;

// Otherwise, uncheck the currently checked RadioButton, check the newly checked 
// RadioButton, and store it for future reference.
mCurrentlyCheckedRB.setChecked(false);
((RadioButton)v).setChecked(true);
mCurrentlyCheckedRB = (RadioButton)v;   

Solution 2

Here's my code:

ListAdapter.java

public class ListAdapter extends BaseAdapter {

    private Context context;
    private String[] version;
    private LayoutInflater inflater;
    private RadioButton selected = null;

    public ListAdapter(Context context, String[] version) {
        this.context = context;
        this.version = version;
        inflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return version.length;
    }

    @Override
    public Object getItem(int position) {
        return version;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View view, ViewGroup viewGroup) {

        final Holder holder;
        if (view == null) {
            holder = new Holder();
            view = inflater.inflate(R.layout.row_list, null);

            holder.radioButton = (RadioButton) view.findViewById(R.id.radio1);
            holder.textViewVersion = (TextView) view.findViewById(R.id.textView1);
            holder.btnMore = (Button) view.findViewById(R.id.button1);

            view.setTag(holder);
        } else {
            holder = (Holder) view.getTag();
        }

        holder.textViewVersion.setText(version[position]);

        //by default last radio button selected
        if (position == getCount() - 1) {
            if (selected == null) {
                holder.radioButton.setChecked(true);
                selected = holder.radioButton;
            }
        }

        holder.radioButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                if (selected != null) {
                    selected.setChecked(false);
                }
                holder.radioButton.setChecked(true);
                selected = holder.radioButton;
            }
        });       
    }

    private class Holder {
        private RadioButton radioButton;
        private TextView textViewVersion;
        private Button btnMore;
    }
}

Hope this helps you :)

Solution 3

Try this hack.

In layout make this changes.

<RadioButton
  android:id="@+id/radio"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center_vertical"
  **android:clickable="false"
  android:focusable="false"**
/>

In your Adapter just add these lines:

 private int selectedPosition = -1;

 viewHolder.choiceButton = (RadioButton)convertView.findViewById(R.id.radio);

 if(selectedPosition == -1) {
    viewHolder.choiceButton.setChecked(position==getCount()-1);
 }
 else{
    viewHolder.choiceButton.setChecked(selectedPosition == position);
 }

In getView() assign selectedPosition:

viewHolder.clickLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                selectedPosition = (int) view.getTag();
                notifyDataSetChanged();
            }
        });

Comments

[androidcodehunter]

You solution works fine. Can you explain your code. I did not understand your code. I am newbie. Thanks.

[Catherine]

I've added some comments to explain it. If this works for you, please set the answer as accepted!

[androidcodehunter]

Thanks for your explanation. I love it.

[Rishi Gautam]

@catherine can u explain ,i am stuck in same issue but in check box how can i use this condition

[Catherine]

What do you need explained that isn't explained above?

[CodeZero]

Pls how does one get the currently checked RadioButton in a variable. Have being trying since morning with no success. I know this is an old post but for reference sakes and for those that will get stuck like me.

[Catherine]

@CodeZero I don't recall exactly, but you should be able to get it in the button's on click listener.

[Rucha Bhatt Joshi]

Thank you.. you are life saver!! :)

[Aown Muhammad]

This code does not work. Multiple radio buttons get selected.

[Deeshant Rajput]

Have you assigned selectedPosition on click layout using getTag() ?

[B.shruti]

Thanks for the help.

[Farruh Habibullaev]

It is a great effort. However, if you have more items than the screen size, the new items's radio button is auto-selected