I have one listview and it get data from Firebase, the problem is that it show the last element added on the down and the old element on the top of the listview, im trying to change the order.
This is my Activity Code:
package com.example.appcamping.Gestion;
public class EnviarMostrarGastos extends AppCompatActivity {
ListView listview;
ArrayList<String> arrayList = new ArrayList<>();
ArrayAdapter<String> arrayAdapter;
Module2 module2;
private EditText mEditPrecio;
private EditText mEditNombreGasto;
private DatabaseReference mDatabaseGastos;
private Button mEnviarGastos;
private String mFechaGasto;
//----------------MOSTRAR GASTOS
private DatabaseReference databaseReference;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_enviar_mostrar_gastos);
mFechaGasto = new Date().toString();
mEditNombreGasto = (EditText) findViewById(R.id.editNombreGasto);
mEditPrecio = (EditText) findViewById(R.id.editPrecio);
mDatabaseGastos = FirebaseDatabase.getInstance().getReference();
mEnviarGastos = findViewById(R.id.btnEnviarGastos);
mEnviarGastos.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String key = mDatabaseGastos.child("Gastos").push().getKey();
String nombregasto = mEditNombreGasto.getText().toString();
String precio = mEditPrecio.getText().toString();
String fechagasto = mFechaGasto;
mDatabaseGastos.child("Gastos").child(key).child("NombreGasto").setValue(nombregasto);
mDatabaseGastos.child("Gastos").child(key).child("Precio").setValue(precio);
mDatabaseGastos.child("Gastos").child(key).child("FechaGasto").setValue(fechagasto);
}
});
//-----------------MOSTRAR GASTOS--------------
databaseReference= FirebaseDatabase.getInstance().getReference("Gastos");
listview=(ListView) findViewById(R.id.listMostrarGastos);
arrayAdapter= new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, arrayList);
listview.setAdapter(arrayAdapter);
databaseReference.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
String value=dataSnapshot.getValue(Gastos.class).toString();
arrayList.add(value);
arrayAdapter.notifyDataSetChanged();
}
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
}
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
}
This is my xml: enter image description here
and this is how show the elements: enter image description here
