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I have done my project using Spinner and Firebase realtime database read. On newly add value, spinner will not remove the old value, how to do it?
Here the preview https://photos.app.goo.gl/jYTyJvcDpqBeGDTg9
“POS” is the new item I add on my database, here the preview https://photos.app.goo.gl/mH14qQ54ra3ULBZH8
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinner = (Spinner) findViewById(R.id.tujuan_spinner);
databaseReference = FirebaseDatabase.getInstance().getReference("Spinner_Tujuan");
spinnerDataList = new ArrayList<>();
adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_dropdown_item, spinnerDataList);
spinner.setAdapter(adapter);
retrieveData();
When I add new Value, spinner still keep old value which its become dupilicate value. How can I remove old value when new Value are inserted?
//HERE
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, final int i, long l) {
spinner.setSelection(i);
final String value =spinner.getSelectedItem().toString();
if (value.equals("SILA PILIH")){
//DO nothing
}if (value.equals("Pegawai")){
bukasenaraiPegawai();
} else {
admin.setValue(value);
openDialogInfo();
spinner.setSelection(0);
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
}
public void retrieveData(){
listener = databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot item : dataSnapshot.getChildren()){
spinnerDataList.add(item.getValue().toString());
}
adapter.notifyDataSetChanged();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
}
Answer
Every time your onDataChange method is called, the dataSnapshot contains a snapshot of all data at databaseReference. So you’ll need to clear the existing data from the spinnerDataList to prevent duplicates:
listener = databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
spinnerDataList.clear();
for (DataSnapshot item : dataSnapshot.getChildren()){
spinnerDataList.add(item.getValue().toString());
}
adapter.notifyDataSetChanged();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
throw databaseError.toException(); // don't ignore errors
}
});
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