In order to show an alert dialog containing a link which can be opened by clicking it, you can use the following code:
AlertDialog.Builder builder1 = new AlertDialog.Builder(youractivity.this);
builder1.setMessage(Html.fromHtml("your message,<a href=\"http://www.google.com\">link</a>"));
builder1.setCancelable(false);
builder1.setPositiveButton("ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
AlertDialog Alert1 = builder1.create();
Alert1 .show();
((TextView)Alert1.findViewById(android.R.id.message)).setMovementMethod(LinkMovementMethod.getInstance());