How to show a with multi select list options in a dialog box interface in android?

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Java

Mobile

Android

Hello friends, I am a new to Android development. I want to show a Listbutton dialog box with multichoiceitems options in android. for that I have used the below code.

I am calling this dialog box on button click event.
I am able to see the title and message I set for that dialog box, and button also is visible but I am unable to get the list of colors that I am setting to the dialog.

here is my code

btn=(Button) findViewById(R.id.button2);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
final ArrayList<String> selColors=new ArrayList<String>();	
try
{
		AlertDialog.Builder dialog1=new AlertDialog.Builder(getApplicationContext());
		final String[] Colors={"Red","Green","Blue","Orange","Pink"};
		final boolean[] _selections = {true,true,true,true,true,true,true};
		dialog1.setTitle("Colors List");
		dialog1.setMessage("Select Your Favoriate Color");
		dialog1.setMultiChoiceItems(Colors, _selections, new DialogInterface.OnMultiChoiceClickListener()
	{	
	@Override
	public void onClick(DialogInterface dialog, int which, boolean isChecked)
	{
	if(isChecked)
	{
	selColors.add(Colors [which]);
	Toast.makeText(getApplicationContext(),"You have selected " + Colors [which],Toast.LENGTH_SHORT).show();
	}
	}
	});
	dialog1.setPositiveButton("OKAY", new DialogInterface.OnClickListener() {
	@Override
public void onClick(DialogInterface dialog, int id) {
Toast.makeText(getApplicationContext(),"SAVED",Toast.LENGTH_SHORT).show();
}
});
dialog1.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
Toast.makeText(getApplicationContext(),"CANCELED",Toast.LENGTH_SHORT).show();
}
});
}
catch(Exception ex)
{
TextView tv=(TextView) findViewById(R.id.textView1);
tv.setText(ex.toString());
Toast.makeText(getApplicationContext(),ex.toString(),Toast.LENGTH_LONG).show();
}
}
});

Please provide me what may be the wrong. Why I am unable to call the event I mean nothing is happening when I click the button.

Thanks
Ganesh