刪除項目後更新Fragment和BaseAdapter中的方法？

我有一個計算銷售額的方法的片段。我在這個Fragment裏面還有一個帶有BaseAdapter的ListView，顯示出售它的售價。在這個ListView中有每行刪除銷售的按鈕。在我的片段中，我有一種方法可以計算出售物品的所有價值。在ListView中刪除銷售項目後，我想重新計算我的銷售，並且我想要刪除包含此項目的ListView行。問題是我不能執行此方法來重新計算我的銷售，並且在刪除項目行後我無法更改我的ListView。刪除項目後更新Fragment和BaseAdapter中的方法？

我該怎麼辦？

片段

public class CarrinhoFrag extends Fragment implements View.OnClickListener,AdapterView.OnItemClickListener, AdapterView.OnItemSelectedListener{ 
private final String TAG = getClass().getSimpleName() + "->"; 
private ProgressDialog progress; 
private TextView tvNomeCliente; 
private TextView tvTotalProntaEntrega; 
private TextView tvTotalEntregaFutura; 
private TextView tvValorTotalCompra; 

//fields 
private ListView lvEntregaFutura; 
private ListView lvProntaEntrega; 
private ScrollView scrollView; 

//buttons 
private Button btFinalizar; 
private Button btCancelar; 

//adapter 
private CarrinhoListAdapter carrinhoProntaEntrega; 
private CarrinhoListAdapter carrinhoEntregaFutura; 

//informacoes venda 
private DatabaseHelper dh; 
private VendaSQLiteDAO vendaDAO; 
private Venda venda; 

//formas pagto 
private String[] listaFormaPagto; 
private FormasPagtoListAdapter formasPagtoLA; 
private Spinner spinFormaPagto; 
private String formapagto; 
private Integer parcelas = 0; 

//dialog alerta pagamento cartao de credito 
private AlertDialog alertDialogCC; 
private TextView tvResult; 

//dialog alerta pagamento carteira 
private AlertDialog alertDialogCarteira; 


//total da compra 
private BigDecimal totalCompra; 


@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    //dao de venda 
    try { 
     dh = new DatabaseHelper(getActivity()); 
     vendaDAO = new VendaSQLiteDAO(dh.getConnectionSource()); 
    } catch (SQLException e) { 
     Log.e("SQLException CarrinhoFrag->", e.getLocalizedMessage()); 
    } 

} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) { 
    View view = inflater.inflate(R.layout.carrinho_listview, container, false); 

    scrollView = (ScrollView)view.findViewById(R.id.scrollView); 
    tvNomeCliente = (TextView)view.findViewById(R.id.tvNomeCliente); 
    lvProntaEntrega = (ListView)view.findViewById(R.id.lvProntaEntrega); 
    lvEntregaFutura = (ListView)view.findViewById(R.id.lvEntregaFutura); 
    tvTotalProntaEntrega = (TextView)view.findViewById(R.id.tvTotalProntaEntrega); 
    tvTotalEntregaFutura = (TextView)view.findViewById(R.id.tvTotalEntregaFutura); 
    tvValorTotalCompra = (TextView)view.findViewById(R.id.tvValorTotalCompra); 

    //buttons 
    btFinalizar = (Button)view.findViewById(R.id.btFinalizar); 
    btCancelar = (Button)view.findViewById(R.id.btCancelar); 
    btFinalizar.setOnClickListener(this); 
    btCancelar.setOnClickListener(this); 

    //forma pagto 
    listaFormaPagto = getResources().getStringArray(R.array.formasPagto); 
    spinFormaPagto = (Spinner)view.findViewById(R.id.spinFormaPagto); 

    return view; 
} 

@Override 
public void onActivityCreated(Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 
    if(getVendaSQLite() > 0){ 
     getVendaSQLite(); 
     init(); 
     listener(); 
    }else{ 
     btFinalizar.setEnabled(false); 
     btCancelar.setEnabled(false); 
    } 

} 

/** begin */ 
public void init(){ 
    tvNomeCliente.setText("Cliente: " + venda.getCliente().getNome()); 

    //lista pronta entrega 
    List<ItensVenda> listaProntaEntrega = new ArrayList<ItensVenda>(); 
    //lista entrega futura 
    List<ItensVenda> listaEntregaFutura = new ArrayList<ItensVenda>(); 
    //cria lista dos itens para exibicao no listview 
    for(ItensVenda i : venda.getItens()){ 
     if(i.getEntregaFutura() == 0){ 
      listaProntaEntrega.add(i); 
     }else{ 
      listaEntregaFutura.add(i); 
     } 
    } 

    //carrinho pronta entrega listadapter 
    if(carrinhoProntaEntrega == null){ 
     carrinhoProntaEntrega = new CarrinhoListAdapter(getView().getContext(), listaProntaEntrega); 
     lvProntaEntrega.setAdapter(carrinhoProntaEntrega); 
     carrinhoProntaEntrega.setCarrinhoFrag(CarrinhoFrag.this); 
    }else{ 
     carrinhoProntaEntrega.changeLista(listaProntaEntrega); 
    } 

    //carrinho entrega futura listadapter 
    if(carrinhoEntregaFutura == null){ 
     carrinhoEntregaFutura = new CarrinhoListAdapter(getView().getContext(), listaEntregaFutura); 
     lvEntregaFutura.setAdapter(carrinhoEntregaFutura); 
     carrinhoEntregaFutura.setCarrinhoFrag(CarrinhoFrag.this); 
    }else{ 
     carrinhoEntregaFutura.changeLista(listaEntregaFutura); 
    } 

    //formas pagto 
    formasPagtoLA = new FormasPagtoListAdapter(getView().getContext(), listaFormaPagto); 
    spinFormaPagto.setAdapter(formasPagtoLA); 
    spinFormaPagto.setOnItemSelectedListener(this); 

    //calcula valores 
    calculaValoresCompra(); 
} 

/** listener listview, ativa o scroll para o listview */ 
private void listener(){ 
    lvProntaEntrega.setOnTouchListener(new View.OnTouchListener() { 
     @Override 
     public boolean onTouch(View v, MotionEvent event) { 
      scrollView.requestDisallowInterceptTouchEvent(true); 
      int action = event.getActionMasked(); 
      switch (action) { 
       case MotionEvent.ACTION_UP: 
        scrollView.requestDisallowInterceptTouchEvent(false); 
        break; 
      } 
      return false; 
     } 
    }); 

    lvEntregaFutura.setOnTouchListener(new View.OnTouchListener() { 
     @Override 
     public boolean onTouch(View v, MotionEvent event) { 
      scrollView.requestDisallowInterceptTouchEvent(true); 
      int action = event.getActionMasked(); 
      switch (action) { 
       case MotionEvent.ACTION_UP: 
        scrollView.requestDisallowInterceptTouchEvent(false); 
        break; 
      } 
      return false; 
     } 
    }); 
} 


/** 
* calcula valores da compra 
* calculate itens of sale 
*/ 
public void calculaValoresCompra(){ 
    BigDecimal bgTotalPE = new BigDecimal(0); 
    BigDecimal bgTotalEF = new BigDecimal(0); 
    BigDecimal bgTotalCompra = new BigDecimal(0); 
    for(ItensVenda i : venda.getItens()){ 
     for(Produto p : i.getProdutos()){ 
      if(i.getEntregaFutura() == 0){ 
       BigDecimal valor = p.getPreco_venda(); 
       bgTotalPE = bgTotalPE.add(valor); 
      }else{ 
       BigDecimal valor = p.getPreco_venda(); 
       bgTotalEF = bgTotalEF.add(valor); 
      } 
     } 
    } 
    bgTotalCompra = bgTotalCompra.add(bgTotalPE).add(bgTotalEF); 
    totalCompra = bgTotalCompra; 

    tvTotalProntaEntrega.setText("R$ " + FormataMonetarios.getMoney(bgTotalPE)); 
    tvTotalEntregaFutura.setText("R$ " + FormataMonetarios.getMoney(bgTotalEF)); 
    tvValorTotalCompra.setText("R$" + FormataMonetarios.getMoney(bgTotalCompra)); 
} 


/** retornaa a venda corrente com status = 1 */ 
private Integer getVendaSQLite(){ 
    List<Venda> list = new ArrayList<Venda>(); 
    try { 
     QueryBuilder<Venda, Integer> qb = vendaDAO.queryBuilder(); 
     Where where = qb.where(); 
     where.eq("status", 1); 
     PreparedQuery<Venda> pq = qb.prepare(); 
     list = vendaDAO.query(pq); 
     //se existir venda aberta seta o id da venda, se naum cria novo objeto de venda 
     if(list.size() > 0){ 
      venda = list.get(0); 
      Log.i("VENDA ID->", venda.getId() + ""); 
     }else{ 
      Toast.makeText(getView().getContext(), "Nenhuma venda corrente encontrada", Toast.LENGTH_SHORT).show(); 
     } 
    } catch (SQLException e) { 
     Log.e("SQLException getVendaSQLite CarrinhoFrag->", e.getLocalizedMessage()); 
    } 
    return list.size(); 
} 

@Override 
public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

} 

@Override 
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
    if(parent == spinFormaPagto){ 
     formapagto = listaFormaPagto[position]; 
     showParcelas(formapagto); 
    } 
} 

@Override 
public void onNothingSelected(AdapterView<?> parent) { 

} 

private void showParcelas(String forma){ 
    if(forma.equals("CARTÃO-CRÉDITO")){ 
     parcelas = 1; 
     showDialogCC(); 
    }else if(forma.equals("CARTEIRA")){ 
     parcelas = 1; 
     showDialogCarteira(); 
    }else if(forma.equals("DINHEIRO")){ 
     parcelas = 0; 
    } 
} 

@Override 
public void onClick(View v) { 
    if(v == btCancelar){ 
     cancelarVenda(); 
    } 
} 

/** exibe dialog de pagamento cartao de credito */ 
private void showDialogCC(){ 
    LayoutInflater li = LayoutInflater.from(getView().getContext()); 
    final View promptsView = li.inflate(R.layout.parcelas_cartao_dialog, null); 
    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getView().getContext()); 
    alertDialogBuilder.setView(promptsView); 

    //componentes 
    final TextView tvValorParcela = (TextView)promptsView.findViewById(R.id.tvValorParcela); 
    final Button btPlus = (Button)promptsView.findViewById(R.id.btPlus); 
    final Button btMinus = (Button)promptsView.findViewById(R.id.btMinus); 
    tvResult = (TextView)promptsView.findViewById(R.id.tvResult); 

    exibeValoresParcelasCC(parcelas); 

    btPlus.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      parcelas++; 
      if(parcelas > 8){ 
       parcelas = 8; 
      } 
      exibeValoresParcelasCC(parcelas); 
      tvValorParcela.setText(String.valueOf(parcelas)); 
     } 
    }); 
    btMinus.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      parcelas--; 
      if(parcelas < 1){ 
       parcelas = 1; 
      } 
      exibeValoresParcelasCC(parcelas); 
      tvValorParcela.setText(String.valueOf(parcelas)); 
     } 
    }); 
    final Button btConfirmar = (Button)promptsView.findViewById(R.id.btConfirmar); 
    btConfirmar.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      alertDialogCC.dismiss(); 
     } 
    }); 

    //AlertDialog 
    alertDialogCC = alertDialogBuilder.create(); 
    alertDialogCC.setCancelable(false); 
    alertDialogCC.show(); 
} 


/** exibe dialog de pagamento carteira */ 
private void showDialogCarteira(){ 
    LayoutInflater li = LayoutInflater.from(getView().getContext()); 
    final View promptsView = li.inflate(R.layout.parcelas_carteira_dialog, null); 
    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getView().getContext()); 
    alertDialogBuilder.setView(promptsView); 

    //componentes 
    final EditText etP1 = (EditText)promptsView.findViewById(R.id.etP1); 
    final EditText etP2 = (EditText)promptsView.findViewById(R.id.etP2); 
    final EditText etP3 = (EditText)promptsView.findViewById(R.id.etP3); 
    final EditText etDataVencimento = (EditText)promptsView.findViewById(R.id.etDataVencimento); 
    final TextView tvP1 = (TextView)promptsView.findViewById(R.id.tvP1); 
    final TextView tvP2 = (TextView)promptsView.findViewById(R.id.tvP2); 
    final TextView tvP3 = (TextView)promptsView.findViewById(R.id.tvP3); 
    final TextView tvTotalCompra = (TextView)promptsView.findViewById(R.id.tvTotalCompra); 
    final TextView tvTotalParcela = (TextView)promptsView.findViewById(R.id.tvTotalParcela); 

    // 
    etP1.setText("0.00"); 
    etP2.setText("0.00"); 
    etP3.setText("0.00"); 
    tvTotalCompra.setText(String.format("Total Compra = %s", FormataMonetarios.getMoney(totalCompra))); 


    etP1.setOnFocusChangeListener(new View.OnFocusChangeListener() { 
     @Override 
     public void onFocusChange(View v, boolean hasFocus) { 
      if(!hasFocus){ 
       if(etP1.getText().toString().isEmpty()){ 
        etP1.setText("0.00"); 
       } 
      } 
      tvP1.setText(String.format("1ª Parcela = %s", FormataMonetarios.getMoney(new BigDecimal(etP1.getText().toString())))); 
      String p1 = etP1.getText().toString(); 
      String p2 = etP2.getText().toString(); 
      String p3 = etP3.getText().toString(); 
      BigDecimal b1 = new BigDecimal(p1); 
      BigDecimal b2 = new BigDecimal(p2); 
      BigDecimal b3 = new BigDecimal(p3); 
      BigDecimal bgTotal = new BigDecimal(0); 
      bgTotal = bgTotal.add(b1).add(b2).add(b3); 

      tvTotalParcela.setText(String.format("Total Parcelas = %s", FormataMonetarios.getMoney(bgTotal))); 
     } 
    }); 
    etP2.setOnFocusChangeListener(new View.OnFocusChangeListener() { 
     @Override 
     public void onFocusChange(View v, boolean hasFocus) { 
      if(!hasFocus){ 
       if(etP2.getText().toString().isEmpty()){ 
        etP2.setText("0.00"); 
       } 
      } 
      tvP2.setText(String.format("2ª Parcela = %s", FormataMonetarios.getMoney(new BigDecimal(etP2.getText().toString())))); 
      String p1 = etP1.getText().toString(); 
      String p2 = etP2.getText().toString(); 
      String p3 = etP3.getText().toString(); 
      BigDecimal b1 = new BigDecimal(p1); 
      BigDecimal b2 = new BigDecimal(p2); 
      BigDecimal b3 = new BigDecimal(p3); 
      BigDecimal bgTotal = new BigDecimal(0); 
      bgTotal = bgTotal.add(b1).add(b2).add(b3); 

      tvTotalParcela.setText(String.format("Total Parcelas = %s", FormataMonetarios.getMoney(bgTotal))); 
     } 
    }); 
    etP3.setOnFocusChangeListener(new View.OnFocusChangeListener() { 
     @Override 
     public void onFocusChange(View v, boolean hasFocus) { 
      if(!hasFocus){ 
       if(etP3.getText().toString().isEmpty()){ 
        etP3.setText("0.00"); 
       } 
      } 
      tvP3.setText(String.format("3ª Parcela = %s", FormataMonetarios.getMoney(new BigDecimal(etP3.getText().toString())))); 
      String p1 = etP1.getText().toString(); 
      String p2 = etP2.getText().toString(); 
      String p3 = etP3.getText().toString(); 
      BigDecimal b1 = new BigDecimal(p1); 
      BigDecimal b2 = new BigDecimal(p2); 
      BigDecimal b3 = new BigDecimal(p3); 
      BigDecimal bgTotal = new BigDecimal(0); 
      bgTotal = bgTotal.add(b1).add(b2).add(b3); 

      tvTotalParcela.setText(String.format("Total Parcelas = %s", FormataMonetarios.getMoney(bgTotal))); 
     } 
    }); 


    final Button btConfirmar = (Button)promptsView.findViewById(R.id.btConfirmar); 
    btConfirmar.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      BigDecimal total = new BigDecimal(0); 
      String p1 = etP1.getText().toString(); 
      String p2 = etP2.getText().toString(); 
      String p3 = etP3.getText().toString(); 
      BigDecimal b1 = new BigDecimal(p1); 
      BigDecimal b2 = new BigDecimal(p2); 
      BigDecimal b3 = new BigDecimal(p3); 
      total = total.add(b1).add(b2).add(b3); 

      //tvTotalCompra.setText(String.format("Total Compra = %s", FormataMonetarios.getMoney(total))); 
      if(etDataVencimento.getText().toString().trim().isEmpty()){ 
       Toast.makeText(getView().getContext(), "Informe a data de vencimento", Toast.LENGTH_SHORT).show(); 
      }else if(totalCompra.compareTo(total) >= 0){ 
       Toast.makeText(getView().getContext(), "O valor total da compra é maior que o valor das parcelas", Toast.LENGTH_SHORT).show(); 
      }else { 
       alertDialogCarteira.dismiss(); 
      } 
     } 
    }); 

    //AlertDialog 
    alertDialogCarteira = alertDialogBuilder.create(); 
    alertDialogCarteira.setCancelable(false); 
    alertDialogCarteira.show(); 
} 


/** exibe os valores para parcela compra cartão */ 
private void exibeValoresParcelasCC(int parcela){ 
    //calcula e exibe o valor 
    BigDecimal valor = new BigDecimal(0); 
    //total compra 
    //parcelas 
    BigDecimal p = new BigDecimal(parcela); 
    valor = totalCompra.divide(p, 2, BigDecimal.ROUND_HALF_UP); 
    Log.i("VALOR->", valor + ""); 
    String resultado = String.format("R$ %s ÷ %s = R$ %s", FormataMonetarios.getMoney(totalCompra), parcelas, FormataMonetarios.getMoney(valor)); 
    tvResult.setText(resultado); 
} 



/** cancela a venda e limpa o banco de dados */ 
private void cancelarVenda(){ 
    AlertDialog.Builder alert = new AlertDialog.Builder(getView().getContext()); 
    alert.setCancelable(false); 
    alert.setTitle("Kontrole"); 
    alert.setMessage("Deseja realmente cancelar ?"); 
    alert.setPositiveButton("Sim", new DialogInterface.OnClickListener() { 
     @Override 
     public void onClick(DialogInterface dialog, int which) { 
      getView().getContext().deleteDatabase(DatabaseHelper.databaseName); 
      FragmentTransaction ft = getFragmentManager().beginTransaction(); 
      Fragment frag = new VendasFrag(); 
      ft.replace(R.id.fl, frag); 
      ft.addToBackStack(KontroleConfigs.TAG_TOBACKSTACK); 
      ft.commit(); 
     } 
    }); 
    alert.setNegativeButton("Não", new DialogInterface.OnClickListener() { 
     @Override 
     public void onClick(DialogInterface dialog, int which) { 
      dialog.dismiss(); 
     } 
    }); 
    AlertDialog dialog = alert.create(); 
    dialog.show(); 

}

}

BaseAdapter

public class CarrinhoListAdapter extends BaseAdapter{ 
    private Context context; 
    private List<ItensVenda> lista; 
    private CarrinhoFrag cf; 


    public CarrinhoListAdapter(Context context, List<ItensVenda> lista) { 
     this.context = context; 
     this.lista = lista; 
    } 

    public void changeLista(List<ItensVenda> lista){ 
     this.lista = lista; 
     notifyDataSetChanged(); 
    } 


    public void setCarrinhoFrag(CarrinhoFrag cf){ 
     this.cf = cf; 
    } 


    @Override 
    public int getCount() { 
     return lista.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     return lista.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 



    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) { 
     ItensVenda iv = lista.get(position); 
     final ViewHolder holder; 
     if (convertView == null) { 
      holder = new ViewHolder(); 
      LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.carrinho_listadapter, parent, false); 

      holder.llCarrinhoAdapter = (LinearLayout) convertView.findViewById(R.id.llCarrinhoAdapter); 
      holder.tvQtd = (TextView)convertView.findViewById(R.id.tvQtd); 
      holder.tvProduto = (TextView)convertView.findViewById(R.id.tvProduto); 
      holder.tvValorProduto = (TextView)convertView.findViewById(R.id.tvValorProduto); 
      holder.ibExcluir = (ImageButton)convertView.findViewById(R.id.ibExcluir); 

      convertView.setTag(holder); 
     }else{ 
      holder = (ViewHolder)convertView.getTag(); 
     } 

     holder.tvQtd.setText(FormataQuantidade.getQuantidade(iv.getQuantidade())); 
     for(Produto p : iv.getProdutos()){ 
      holder.tvProduto.setText(p.getNome()); 
      holder.tvValorProduto.setText(" R$ " + FormataMonetarios.getMoney(p.getPreco_venda())); 
     } 

     holder.ibExcluir.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       ItensVenda item = lista.get(position); 
       removeItem(item); 
      } 
     }); 

     return convertView; 
    } 

    /** remove item */ 
    private void removeItem(ItensVenda item){ 
     try { 
      DatabaseHelper dh = new DatabaseHelper(this.context); 
      ItemVendaSQLiteDAO itensVendaDAO = new ItemVendaSQLiteDAO(dh.getConnectionSource()); ; 
      DeleteBuilder<ItensVenda, Integer> deleteBuilder = itensVendaDAO.deleteBuilder(); 
      deleteBuilder.where().eq("id", item.getId()); 
      int result = deleteBuilder.delete(); 
      if(result == 1){ 
       Log.i("REMOVE->", result + ""); 
       CarrinhoListAdapter.this.notifyDataSetChanged(); 
       cf.calculaValoresCompra(); 
      } 
     } catch (SQLException e) { 
      Log.e("SQLException removeItem", e.getLocalizedMessage()); 
     } 
    } 


    /** pattern view holder */ 
    private static class ViewHolder{ 
     LinearLayout llCarrinhoAdapter; 
     TextView tvQtd; 
     TextView tvProduto; 
     TextView tvValorProduto; 
     ImageButton ibExcluir; 
    } 

}

來源

2015-03-13 FernandoPaiva

您是否收到任何錯誤？ – vinitius 2015-03-13 20:28:54

@vinitius沒有錯誤，cf.calculaValoresCompra（）'片段的方法不執行，適配器不更新（刷新）。 – FernandoPaiva 2015-03-13 20:46:33

由於您沒有收到任何錯誤，而且您的方法沒有執行，您是否檢查過'deleteBuilder.delete（）'的返回值？ – vinitius 2015-03-13 20:53:11

我猜你只缺打電話給你changeLista方法來更新您的適配器的來源。像這樣：

if(result == 1){ 
      Log.i("REMOVE->", result + ""); 
      //after you remove an item, do what you do to retrieve the updated items from venda and pass it to update your adapter. 
      changeLista(yourUpdatedList); 
      cf.calculaValoresCompra(); 
     }

現在的樣子，它似乎只是將它從數據庫中刪除，但是您不刷新適配器的源代碼。

來源

2015-03-13 21:12:01 vinitius

刪除項目後更新Fragment和BaseAdapter中的方法？

回答

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