android - How to make SearchView using list of objects retreived from firebase? -

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i making android app using android studio add student details , retrieve using firebase.i want make activity details of students under 1 activity user allowed make search. function in searchactivity.java retrieve records("studentlist") firebase database

public arraylist<student> getstudentdetails(final arraylist<student>                               arrayliststudent,final listviewadapter adapter) {     firebasedatabase database = firebasedatabase.getinstance();     databasereference fdatabaseroot = database.getreference("studentslist");     fdatabaseroot.orderbychild("name").addvalueeventlistener(new                                                        valueeventlistener() {         @override         public void ondatachange(datasnapshot datasnapshot) {             (datasnapshot areasnapshot : datasnapshot.getchildren()) {                 student stud = areasnapshot.getvalue(student.class);                  arrayliststudent.add(stud);             }                adapter.notifydatasetchanged();         }         @override         public void oncancelled(databaseerror databaseerror) {         }     });     return arrayliststudent; }

in oncreate() method of searchactivity calling function this: setting adapter listview 'list'

arraylist<student> arrayliststudent=new arraylist<>(); listviewadapter adapter=new listviewadapter(this,arrayliststudent); list.setadapter(adapter); arrayliststudent=getstudentdetails(arrayliststudent,adapter);

my searchactivity run , displays list of student's name initially.but type in search box,my app crashes. problem?and how fix this?

screenshotbefore crash





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