alertdroid.java

private void doExit() {
	AlertDialog.Builder ab = new AlertDialog.Builder(MainActivity.this);
	ab.setMessage("Are you sure you want to exit?")
			.setPositiveButton("Yes", dialogClickListener)
			.setNegativeButton("No", dialogClickListener).show();
}

private DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
	@Override
	public void onClick(DialogInterface dialog, int which) {
		switch (which) {
		case DialogInterface.BUTTON_POSITIVE:
			android.os.Process.killProcess(android.os.Process.myPid());
			break;

		case DialogInterface.BUTTON_NEGATIVE:
			// Do Nothing
			break;
		}
	}
};