Radio buttons (single choice)

import android.content.DialogInterface;
import android.app.Activity;
import android.app.AlertDialog;

CharSequence[] values = {" First Item ", " Second Item ", " Third Item "}; 
Activity act;

void setup() {
  background(#F9C454);
  fill(#4A3A16);
  textSize(38);
  textAlign(CENTER);
  text("Click on screen", width/2, height/3);
}

void draw() {
}  

void dialogBox() {
  act = this.getActivity();

  act.runOnUiThread(new Runnable() {
    public void run() {
      AlertDialog.Builder builder = new AlertDialog.Builder(act);
      builder.setTitle("Select Your Choice");
      builder.setSingleChoiceItems(values, -1, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int item) {
          switch(item)
          {
          case 0:
            background(#F9C454);
            text("Click on screen", width/2, height/3);
            text("First Item Clicked", width/2, height/2);
            break;
          case 1:
            background(#F9C454);
            text("Click on screen", width/2, height/3);
            text("Second Item Clicked", width/2, height/2);   
            break;
          case 2:
            background(#F9C454);
            text("Click on screen", width/2, height/3);
            text("Third Item Clicked", width/2, height/2);   
            break;
          }
        }
      }
      );
      builder.setPositiveButton("CONFIRM", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
        }
      }
      )
      .show();
    }
  }
  );
}

void mousePressed() {
  dialogBox();
}