package com.yourpackage;

import java.util.ArrayList;
import java.util.HashMap;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;

public class ListSelectorDialog {
	Context context;
	Builder adb;
	String title;

	// our interface so we can return the selected key/item pair.
	public interface listSelectorInterface {
		void selectedItem(String key, String item);
		void selectorCanceled();
	}
	
	ListSelectorDialog(Context c) {
		this.context = c;
	}
	ListSelectorDialog(Context c, String newTitle) {
		this.context = c;
		this.title = newTitle;
	}
	
	ListSelectorDialog setTitle(String newTitle) {
		this.title = newTitle;
		return this;
	}
	
	ListSelectorDialog show(ArrayList il, final listSelectorInterface di) {
		String l[] = null;
		l = il.toArray(new String[il.size()]);
		
		show(l, l, di);
		return this;
	}
	
	ListSelectorDialog show(ArrayList il, ArrayList ik, 
	  final listSelectorInterface di) {
		// convert the ArrayList's to standard Java arrays.
		String l[] = null; String k[] = null;
		l = il.toArray(new String[il.size()]);
		k = ik.toArray(new String[ik.size()]);
		
		show(l, k, di);
		return this;
	}
	
	ListSelectorDialog show(HashMap hashmap, final listSelectorInterface di) {
		// convert the hashmap to lists
		String[] il = new String[hashmap.size()];
		String[] ik = new String[hashmap.size()];
		// HashMap iteration
		int i = 0;
		for (Object key: hashmap.keySet()) {
			il[i] = key.toString();
			ik[i] = hashmap.get(key).toString();
			i++;
		}
		// now show the selection dialog
		show(il, ik, di);
		return this;
	}
	
	ListSelectorDialog show(final String[] itemList, final listSelectorInterface di) {
		// if only 1 list supplied, the list serves as both keys and values.
		show(itemList, itemList, di);
		return this;
	}
	
	ListSelectorDialog show(final String[] itemList, final String[] keyList, 
	  final listSelectorInterface di) {
		// set up the dialog
		adb = new AlertDialog.Builder(context);
		adb.setCancelable(false);
		adb.setItems(itemList, new DialogInterface.OnClickListener() {
	        // when an item is clicked, notify our interface
	    	public void onClick(DialogInterface d, int n) {
				d.dismiss();
				di.selectedItem(keyList[n], itemList[n]);
	        }
		});
		adb.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
			// when user clicks cancel, notify our interface
			public void onClick(DialogInterface d, int n) {
				d.dismiss();
				di.selectorCanceled();
			}
		});
		adb.setTitle(title);
		// show the dialog
		adb.show();
		return this;
	}
}

// create an instance of ListSelectorDialog.
ListSelectorDialog dlg = new ListSelectorDialog(this, "Select an Operator");
// create our arrays of keys and values to send to the dialog.
String[] listk = new String[] {"+", "-", "*", "/", "%"};
String[] listv = new String[] {"+ Plus", "- Minus", "* Multiply", "/ Divide", "% Modulus"};
// show the list dialog.
dlg.show(listv, listk, new ListSelectorDialog.listSelectorInterface() {
	// procedure if user cancels the dialog.
	public void selectorCanceled() {
		Toast.makeText(getApplicationContext(), 
		  "User Canceled the request!", 1).show();
	}
	// procedure for when a user selects an item in the dialog.
	public void selectedItem(String key, String item) {
		Toast.makeText(getApplicationContext(), 
		  "User Has selected item '"+item+"' having key '"+key+"'!", 1).show();
	}
});