我有一个活动（ServicosUserActivity），其中产品在recyclerview中列出，其中包含从firebase加载的数据。当用户从购物篮中添加（或删除）这些项目之一时，应用程序的主屏幕将启动（调用MainActivity onCreate）。 我注意到在用户操作完成后，将调用ServicosUserActivity onPause方法，然后调用MainActivity onCreate方法。我要在屏幕上保留ServicosUserActivity，直到用户决定进行其他活动
ServicosUserFragment
public class ServicosUserFragment extends Fragment {
private String idUsuario;
private RecyclerView recyclerView;
private AdapterServicoUser adapterServicoUser;
private List<ServicoCliente> servicos = new ArrayList<>();
private List<String> carrinho = new ArrayList<>();
private DatabaseReference carrinhoRef,servicoRef;
private DatabaseReference postagemRef= ConfiguracaoFirebase.getReferenciaFirebase();
private SecurityPreferences mySecurityPreferences;
private ValueEventListener v1, v2;
public ServicosUserFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_servicos_user, container, false);
idUsuario = ConfiguracaoFirebase.getIdUsuario();
carrinhoRef = postagemRef.child("usuarios").child(idUsuario).child("carrinho");
servicoRef = ConfiguracaoFirebase.getReferenciaFirebase().child("servicos");
recyclerView = view.findViewById(R.id.recyclerServicosUser);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(true);
adapterServicoUser = new AdapterServicoUser(servicos,idUsuario,carrinho,getActivity());
recyclerView.setAdapter(adapterServicoUser);
gerenciaServicos();
return view;
}
private void gerenciaServicos() {
v1 = carrinhoRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
carrinho.clear();
if(dataSnapshot.getValue()!=null) {
for (DataSnapshot dados : dataSnapshot.getChildren()) {
String item;
item = (String) dados.getValue();
carrinho.add(item);
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
servicoRef.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
servicos.clear();
for (DataSnapshot dados: dataSnapshot.getChildren()){
ServicoCliente servico = dados.getValue(ServicoCliente.class);
servico.setKey(dados.getKey());
for(String item : carrinho) {
if (servico.getKey().equals(item)) {
servico.setCarrinho(true);
}
}
servicos.add(servico);
}
Collections.reverse(servicos);
adapterServicoUser.notifyDataSetChanged();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
public void onStop() {
super.onStop();
carrinhoRef.removeEventListener(v1);
}
}
AdapterServicoUser
public class AdapterServicoUser extends RecyclerView.Adapter<AdapterServicoUser.MyViewHolder> {
private DatabaseReference ref = ConfiguracaoFirebase.getReferenciaFirebase().child("usuarios");
private DecimalFormatSymbols unusualSymbols = new DecimalFormatSymbols();
private List<ServicoCliente> servicos;
private List<String> carrinho;
private String idUsuario;
private AlertDialog dialog;
private Context context;
public AdapterServicoUser(List<ServicoCliente> servicos,String idUsuario, List<String> carrinho, Context context) {
this.servicos = servicos;
this.carrinho = carrinho;
this.idUsuario = idUsuario;
this.context = context;
}
@NonNull
@Override
public AdapterServicoUser.MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View itemLista = LayoutInflater.from(parent.getContext()).inflate(R.layout.adapter_servico_user, parent, false);
return new MyViewHolder(itemLista);
}
@Override
public void onBindViewHolder(@NonNull final AdapterServicoUser.MyViewHolder holder, int position) {
unusualSymbols.setDecimalSeparator(',');
unusualSymbols.setGroupingSeparator('.');
DecimalFormat decimalFormat = new DecimalFormat("R$ ###,###,##0.00",unusualSymbols);
String precoFormatado;
Log.i("pqp","Adapter servicos");
final ServicoCliente servico = servicos.get(position);
holder.textNome.setText(servico.getNome());
String tempo;
tempo = "Duração média do atendimento: " + servico.getTempo() +
"min";
holder.textTempo.setText(tempo);
precoFormatado = decimalFormat.format(servico.getPreco());
holder.textPreco.setText(precoFormatado);
if(servico.getCarrinho()){
holder.imageCarrinho.setImageResource(R.drawable.ic_add_shopping_cart_accent_24dp);
}else {
holder.imageCarrinho.setImageResource(R.drawable.ic_add_shopping_cart_black_24dp);
}
//Log.i("CHECK","Passou aqui 4" + postagem.getKey() + " " + postagem.getCarrinho());
holder.imageCarrinho.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(servico.getCarrinho()){
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("Carrinho").setMessage("Gostaria de remover este serviço do carrinho?");
builder.setCancelable(false);
builder.setPositiveButton("Confirmar", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// Log.i("CHECK","Passou aqui 5" + servico.getKey() + " == " + s.getCarrinho());
int i = 0;
int j = 0;
for (String item : carrinho){
if (servico.getKey().equals(item)){
j=i;
}
i++;
}
carrinho.remove(j);
holder.imageCarrinho.setImageResource(R.drawable.ic_add_shopping_cart_black_24dp);
ref.child(idUsuario).child("carrinho").setValue(carrinho);
}
});
builder.setNegativeButton("Cancelar", null);
AlertDialog dialog = builder.create();
dialog.show();
}else{
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("Carrinho").setMessage("Gostaria de adicionar este serviço ao carrinho?");
builder.setCancelable(false);
builder.setPositiveButton("Confirmar", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//Log.i("CHECK","Passou aqui 6" + postagem.getKey() + " " + postagem.getCarrinho());
holder.imageCarrinho.setImageResource(R.drawable.ic_add_shopping_cart_accent_24dp);
String item = servico.getKey();
carrinho.add(item);
ref.child(idUsuario).child("carrinho").setValue(carrinho);
}
});
builder.setNegativeButton("Cancelar", null);
AlertDialog dialog = builder.create();
dialog.show();
}
}
});
}
@Override
public int getItemCount() {
return servicos.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView textNome, textPreco, textTempo;
ImageView imageCarrinho;
public MyViewHolder(@NonNull View v) {
super(v);
textNome = v.findViewById(R.id.textAdapterNomeServicosUser);
textTempo = v.findViewById(R.id.textAdapterTempoServicosUser);
textPreco = v.findViewById(R.id.textPrecoAdapterServicoUser);
imageCarrinho = v.findViewById(R.id.imageCarrinhoServico);
}
}
}
