Android Firebase database: how to retrieve multiple rows? -

this database structure:

what trying do, fill listview elements in database, in custom layout 3 textview each line:

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i tried custom adapter, extending firebaselistadapter<>,with class store data, can't solve problem.

can me, please?

firebasedatabase database = firebasedatabase.getinstance();         databasereference myref = database.getreference();         myref.addlistenerforsinglevalueevent(new valueeventlistener() {             @override             public void ondatachange(datasnapshot datasnapshot) {                 if (datasnapshot.haschildren()) {                     (datasnapshot datasnapshot1 : datasnapshot.getchildren()) {                      your_module_obj=   datasnapshot1.getvalue(your_module_class_name.class);                     }                 }             }         @override         public void oncancelled(databaseerror error) {             log.w("dd", "failed read value.", error.toexception());         }     });