Create the alertdialog pop-up box and select a list based on the value.

Effect. The specific function is to obtain a maximum of 5 values, and then construct a list for the user to select.

First, define a number value:

Int num = 5; // the specified quantity.

Then construct a String Array

String [] Nums = new string [(INT) num]; for (INT I = 0; I <nums. length; I ++) {Nums [I] = "" + (I + 1 );}

Alertdialog

Final builder B = new alertdialog. builder (mainactivity. this); B. settitle ("Select Quantity"); B. setitems (Nums, new tdilog (); B. create (). show ();

Customize a class to implement the Android. content. dialoginterface. onclicklistener Interface

Class tdilog implements android. content. dialoginterface. onclicklistener {@ override public void onclick (dialoginterface dialog, int which) {// todo auto-generated method stub int nn = which + 1; toast. maketext (getapplicationcontext (), "The number you choose is" + nn + "", toast. length_long ). show ();}}

So far, this small feature has been completed.