java - How do i get the key UID of a node with a selected value in firebase database in android? -


below database in firebase

areas     -areauid1        -admin           -admin1uid                -admin_name:""                -admin_area:""                -admin_email:""           -admin2uid                -admin_name:""                -admin_area:""               -admin_email:""               .               .       -events           -eventuid1                 -event_name:""                 -event_timings:""          -eventuid2                 -event_name:""                 -event_timings:""             .             .        -gallery           -imageuid1                 -image_link:""    -areauid2        -admin           -admin1uid                -admin_name:""                -admin_area:""                -admin_email:""           -admin2uid                -admin_name:""                -admin_area:""               -admin_email:""               .               .       -events           -eventuid1                 -event_name:""                 -event_timings:""          -eventuid2                 -event_name:""                 -event_timings:""             .             .        -gallery           -imageuid1                 -image_link:""

what want achieve?

i want areauid of areas considering fact there list of admin_areas available populated of same database. when user clicks on item in list want areauid of node admin_area matches selected admin_area list.

for eg) here list of areas presented user -

1)area 1

2)area 2

3)area 3

4)area 4

when user taps on area 2 want fetch areauid.how do this? below code reference

mdbref = firebasedatabase.getinstance().getreference().child("areas");         arr = new arraylist<>();         listview = (listview) findviewbyid(r.id.list_of_areas);         valueeventlistener listener = new valueeventlistener() {             @override             public void ondatachange(datasnapshot datasnapshot) {                 (datasnapshot snapshot : datasnapshot.getchildren()) {                     string areauid = snapshot.getkey();                     log.i("areauid", areauid);                     showlistofareas(areauid);                 }             }              @override             public void oncancelled(databaseerror databaseerror) {                 system.out.println(databaseerror.toexception());             }         };         mdbref.addvalueeventlistener(listener);       }      private void showlistofareas(final string areauid) {          pd.settitle("fetching registered areas");         pd.setmessage("loading areas...");         pd.show();         databasereference mareanameref = mdbref.getref().child(areauid).child("admin").child("admin1");          mareanameref.addvalueeventlistener(new valueeventlistener() {             @override              public void ondatachange(datasnapshot datasnapshot) {                  final admin admin = datasnapshot.getvalue(admin.class);                 arr.add(admin.getadmin_colony());                 adapter = new arrayadapter<>(listofareasactivity.this,                         android.r.layout.simple_list_item_1, android.r.id.text1, arr);                 listview.setadapter(adapter);                 pd.dismiss();                 listview.setonitemclicklistener(new adapterview.onitemclicklistener() {                     @override                     public void onitemclick(adapterview<?> parent, view view, int position, long id) {                          string areaname = (string) parent.getitematposition(position);                         //finduseridwithlocation(areaname);                          sharedpreferences.editor editor = getsharedpreferences("shared_prefs", mode_private).edit();                         editor.putstring("area_name", areaname);                         editor.apply();                         editor.commit();                         intent intent = new intent(listofareasactivity.this, mainactivity.class);                         startactivity(intent);                         finish();                     }                 });              }               @override             public void oncancelled(databaseerror databaseerror) {              }         });       }

based on comment, areauid can retrieved showlistofareas's parameter

private void showlistofareas(final string areauid) {      ...      listview.setonitemclicklistener(new adapterview.onitemclicklistener() {         @override         public void onitemclick(adapterview<?> parent, view view, int position, long id) {             string areaname = (string) parent.getitematposition(position);              // area's uid             string areauidafterclick = areauid;              sharedpreferences.editor editor = getsharedpreferences("shared_prefs", mode_private).edit();             editor.putstring("area_name", areaname);             editor.apply();             editor.commit();             intent intent = new intent(listofareasactivity.this, mainactivity.class);             startactivity(intent);             finish();         }     });      ...  }

let me know if not meant.


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