android - AlertDialog not showing inside OnClickListener -

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i want display alertdialog inside onclicklistener. alertdialog not showing when use following code inside onclicklistener. great.

final alertdialog alertdialog = new alertdialog.builder(myclass.this).create(); alertdialog.settitle("info:"); string alert1 = "first name: " + fname; string alert2 = "surname: " + sname; string alert3 = "id: " + tid; string alert4 = "password: " + tpassword; alertdialog.setmessage(alert1 +"\n"+ alert2 +"\n"+ alert3+"\n" + alert4); alertdialog.setbutton("ok", new dialoginterface.onclicklistener() {                     public void onclick(dialoginterface dialog, int which) {                                                  startactivity(intent);                                             }                                         });                                          alertdialog.show();                                     }});

add below code inside onclicklistner :

 alertdialog.builder dialog1 = new alertdialog.builder(this);             dialog1.settitle("info:");             string alert1 = "first name: " + fname;             string alert2 = "surname: " + sname;             string alert3 = "id: " + tid;             string alert4 = "password: " + tpassword;             dialog1.setmessage(alert1 + "\n" + alert2 + "\n" + alert3 + "\n" + alert4);             dialog1.setbutton("ok", new dialoginterface.onclicklistener() {                 public void onclick(dialoginterface dialog, int which) {                      startactivity(intent);                 }             });             dialog1.show();

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