FutureBuilder: future function calling even after push navigator












1















I have a listview that returns a list of orders from my local database(sqflite) and it's working very well.



After a tile of the list is tapped I push the navigation to another page, when my second page is loaded I notice that future function is called again, my second page loads and works normally but to me it seems unnecessary to call the future function again.



Can I control this behavior?



Here is my code for the first page:



import 'package:flutter/material.dart';
import '../model/coleta.dart';
import 'coletarPedido.dart';

void selectedOrderTile(PedidoColeta pedidoColeta, BuildContext context) {
Navigator.push(context, new MaterialPageRoute(builder: (context) => new ColetaPage(pedidoColeta: pedidoColeta)));
}

Future<List<PedidoColeta>> listaPedidosAguardandoColeta() async {
return await PedidoColeta.retornaListaPedidosColeta(1);
}

Widget pedidosAguardandoColeta(context) {
return new FutureBuilder<List<PedidoColeta>> (
future: listaPedidosAguardandoColeta(),
builder: (BuildContext context, snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
if (snapshot.data == null || snapshot.data.length == 0) {
return new Text("Nenhum pedido por aqui!");
} else {
return new ListView.separated(
padding: const EdgeInsets.all(8.0),
itemCount: snapshot.data.length,
itemBuilder: (context, i) {
return tilePedido(snapshot.data[i], context);
},
separatorBuilder: (context, i) {
return Divider();
},
);
}
}
return new Container(
alignment: AlignmentDirectional.center,
child: new CircularProgressIndicator()
);
},
);
}

Widget tilePedido(PedidoColeta pedidoColeta, context) {
return ListTile(
leading: new Container(
width: 50.0,
height: 50.0,
decoration: new BoxDecoration(
shape: BoxShape.circle,
color: Colors.grey[300],
image: new DecorationImage(
fit: BoxFit.fill,
image: AssetImage(pedidoColeta.logoCliente)
)
)
),
title: Text('Pedido: ' + pedidoColeta.idPedido.toString() + ' Ocam: ' + pedidoColeta.idOcam.toString(), style: Theme.of(context).textTheme.button),
subtitle: Text('Total de Itens: ' + pedidoColeta.qtdItem.toString() + 'nData de Saída: ' + pedidoColeta.dataSaida.toString()),
dense: true,
onTap: () => selectedOrderTile(pedidoColeta, context),
);
}









share|improve this question





























    1















    I have a listview that returns a list of orders from my local database(sqflite) and it's working very well.



    After a tile of the list is tapped I push the navigation to another page, when my second page is loaded I notice that future function is called again, my second page loads and works normally but to me it seems unnecessary to call the future function again.



    Can I control this behavior?



    Here is my code for the first page:



    import 'package:flutter/material.dart';
    import '../model/coleta.dart';
    import 'coletarPedido.dart';

    void selectedOrderTile(PedidoColeta pedidoColeta, BuildContext context) {
    Navigator.push(context, new MaterialPageRoute(builder: (context) => new ColetaPage(pedidoColeta: pedidoColeta)));
    }

    Future<List<PedidoColeta>> listaPedidosAguardandoColeta() async {
    return await PedidoColeta.retornaListaPedidosColeta(1);
    }

    Widget pedidosAguardandoColeta(context) {
    return new FutureBuilder<List<PedidoColeta>> (
    future: listaPedidosAguardandoColeta(),
    builder: (BuildContext context, snapshot) {
    if (snapshot.connectionState == ConnectionState.done) {
    if (snapshot.data == null || snapshot.data.length == 0) {
    return new Text("Nenhum pedido por aqui!");
    } else {
    return new ListView.separated(
    padding: const EdgeInsets.all(8.0),
    itemCount: snapshot.data.length,
    itemBuilder: (context, i) {
    return tilePedido(snapshot.data[i], context);
    },
    separatorBuilder: (context, i) {
    return Divider();
    },
    );
    }
    }
    return new Container(
    alignment: AlignmentDirectional.center,
    child: new CircularProgressIndicator()
    );
    },
    );
    }

    Widget tilePedido(PedidoColeta pedidoColeta, context) {
    return ListTile(
    leading: new Container(
    width: 50.0,
    height: 50.0,
    decoration: new BoxDecoration(
    shape: BoxShape.circle,
    color: Colors.grey[300],
    image: new DecorationImage(
    fit: BoxFit.fill,
    image: AssetImage(pedidoColeta.logoCliente)
    )
    )
    ),
    title: Text('Pedido: ' + pedidoColeta.idPedido.toString() + ' Ocam: ' + pedidoColeta.idOcam.toString(), style: Theme.of(context).textTheme.button),
    subtitle: Text('Total de Itens: ' + pedidoColeta.qtdItem.toString() + 'nData de Saída: ' + pedidoColeta.dataSaida.toString()),
    dense: true,
    onTap: () => selectedOrderTile(pedidoColeta, context),
    );
    }









    share|improve this question



























      1












      1








      1








      I have a listview that returns a list of orders from my local database(sqflite) and it's working very well.



      After a tile of the list is tapped I push the navigation to another page, when my second page is loaded I notice that future function is called again, my second page loads and works normally but to me it seems unnecessary to call the future function again.



      Can I control this behavior?



      Here is my code for the first page:



      import 'package:flutter/material.dart';
      import '../model/coleta.dart';
      import 'coletarPedido.dart';

      void selectedOrderTile(PedidoColeta pedidoColeta, BuildContext context) {
      Navigator.push(context, new MaterialPageRoute(builder: (context) => new ColetaPage(pedidoColeta: pedidoColeta)));
      }

      Future<List<PedidoColeta>> listaPedidosAguardandoColeta() async {
      return await PedidoColeta.retornaListaPedidosColeta(1);
      }

      Widget pedidosAguardandoColeta(context) {
      return new FutureBuilder<List<PedidoColeta>> (
      future: listaPedidosAguardandoColeta(),
      builder: (BuildContext context, snapshot) {
      if (snapshot.connectionState == ConnectionState.done) {
      if (snapshot.data == null || snapshot.data.length == 0) {
      return new Text("Nenhum pedido por aqui!");
      } else {
      return new ListView.separated(
      padding: const EdgeInsets.all(8.0),
      itemCount: snapshot.data.length,
      itemBuilder: (context, i) {
      return tilePedido(snapshot.data[i], context);
      },
      separatorBuilder: (context, i) {
      return Divider();
      },
      );
      }
      }
      return new Container(
      alignment: AlignmentDirectional.center,
      child: new CircularProgressIndicator()
      );
      },
      );
      }

      Widget tilePedido(PedidoColeta pedidoColeta, context) {
      return ListTile(
      leading: new Container(
      width: 50.0,
      height: 50.0,
      decoration: new BoxDecoration(
      shape: BoxShape.circle,
      color: Colors.grey[300],
      image: new DecorationImage(
      fit: BoxFit.fill,
      image: AssetImage(pedidoColeta.logoCliente)
      )
      )
      ),
      title: Text('Pedido: ' + pedidoColeta.idPedido.toString() + ' Ocam: ' + pedidoColeta.idOcam.toString(), style: Theme.of(context).textTheme.button),
      subtitle: Text('Total de Itens: ' + pedidoColeta.qtdItem.toString() + 'nData de Saída: ' + pedidoColeta.dataSaida.toString()),
      dense: true,
      onTap: () => selectedOrderTile(pedidoColeta, context),
      );
      }









      share|improve this question
















      I have a listview that returns a list of orders from my local database(sqflite) and it's working very well.



      After a tile of the list is tapped I push the navigation to another page, when my second page is loaded I notice that future function is called again, my second page loads and works normally but to me it seems unnecessary to call the future function again.



      Can I control this behavior?



      Here is my code for the first page:



      import 'package:flutter/material.dart';
      import '../model/coleta.dart';
      import 'coletarPedido.dart';

      void selectedOrderTile(PedidoColeta pedidoColeta, BuildContext context) {
      Navigator.push(context, new MaterialPageRoute(builder: (context) => new ColetaPage(pedidoColeta: pedidoColeta)));
      }

      Future<List<PedidoColeta>> listaPedidosAguardandoColeta() async {
      return await PedidoColeta.retornaListaPedidosColeta(1);
      }

      Widget pedidosAguardandoColeta(context) {
      return new FutureBuilder<List<PedidoColeta>> (
      future: listaPedidosAguardandoColeta(),
      builder: (BuildContext context, snapshot) {
      if (snapshot.connectionState == ConnectionState.done) {
      if (snapshot.data == null || snapshot.data.length == 0) {
      return new Text("Nenhum pedido por aqui!");
      } else {
      return new ListView.separated(
      padding: const EdgeInsets.all(8.0),
      itemCount: snapshot.data.length,
      itemBuilder: (context, i) {
      return tilePedido(snapshot.data[i], context);
      },
      separatorBuilder: (context, i) {
      return Divider();
      },
      );
      }
      }
      return new Container(
      alignment: AlignmentDirectional.center,
      child: new CircularProgressIndicator()
      );
      },
      );
      }

      Widget tilePedido(PedidoColeta pedidoColeta, context) {
      return ListTile(
      leading: new Container(
      width: 50.0,
      height: 50.0,
      decoration: new BoxDecoration(
      shape: BoxShape.circle,
      color: Colors.grey[300],
      image: new DecorationImage(
      fit: BoxFit.fill,
      image: AssetImage(pedidoColeta.logoCliente)
      )
      )
      ),
      title: Text('Pedido: ' + pedidoColeta.idPedido.toString() + ' Ocam: ' + pedidoColeta.idOcam.toString(), style: Theme.of(context).textTheme.button),
      subtitle: Text('Total de Itens: ' + pedidoColeta.qtdItem.toString() + 'nData de Saída: ' + pedidoColeta.dataSaida.toString()),
      dense: true,
      onTap: () => selectedOrderTile(pedidoColeta, context),
      );
      }






      flutter






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      edited Nov 22 '18 at 16:02









      MTCoster

      3,13621940




      3,13621940










      asked Nov 22 '18 at 15:44









      limarslimars

      212




      212
























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