CODEWITHSUNDEEP
flutterasync-awaitfuture
katre
katre

Reputation: 313

How to handle loading and completion without using futurebuilder in flutter

I cannot distinguish two different situations by the method in the example. How can I handle loading and completion situations?

//async method   

     void list() {
            databaseHelper.list().then((records) {
             setState(() {
              _recordList = records;
             });
            });
          }

_recordList.length > 0
 ? ListView.builder(
     itemCount: _recordList.length,
     itemBuilder: (context, index) {
     return {....}                          
   })
   : Center(
       child: Text("No Record"),
     ),

I want to show CircularProgressIndicator () until the list is loaded, but if the list is empty, I want to show "No Record".

What is the way to do without using futurebuilder?

Upvotes: 0

Views: 374

Answers (1)

FloW
FloW

Reputation: 1266

you can handle it with value null or 0

void list() {
  _recordList = null;
            databaseHelper.list().then((records) {
             setState(() {
              _recordList = records;
             });
            });
          }

but the void list, must return a new List() when they found no records..

_recordList == null ? new new CircularProgressIndicator() : 
_recordList.length > 0
 ? ListView.builder(
     itemCount: _recordList.length,
     itemBuilder: (context, index) {
     return {....}                          
   })
   : Center(
       child: Text("No Record"),
     ),

Upvotes: 1

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