whenever i select the dropdown value in this code cursor(pointer) move to the upper textfield . How to solve this problem?? about searchable_dropdown HOT 10 CLOSED

Column(
    children: [

    Padding(
    padding: const EdgeInsets.only(top: 14),
    child: new TextField(

    // maxLengthEnforced: true,
    keyboardType: TextInputType.multiline,
//    controller: controller1,
    decoration: new InputDecoration(
    // contentPadding: EdgeInsets.symmetric(vertical: 26,horizontal: 10),
    border: OutlineInputBorder(),
    hintText: "Add Task name Only",
    labelText: "Add Task name only"
    ),
    ),
    ),
    new SizedBox(
    height:6
    ),

    Column(
    children: <Widget>[

    Row(
    mainAxisAlignment: MainAxisAlignment.start,
    children: <Widget>[
    new Text("Select Product:", style: new TextStyle(fontSize: 12),),
    ],
    ),

    Container(

    height: 150,
//    width: MediaQuery.of(context).size.width,
    width:150,
    decoration: ShapeDecoration(

    shape: RoundedRectangleBorder(

    side: BorderSide(width: 1.0, style: BorderStyle.solid, color: Colors.blue),
    borderRadius: BorderRadius.all(Radius.circular(5.0)),
    ),
    ),
    child: Padding(
    padding: const EdgeInsets.symmetric(horizontal:10.0),
    child: StatefulBuilder(
    //stream: null,
    builder: (BuildContext context, StateSetter setState) {
    /*  return  DropdownButton<String>(
                            //  hint: Text('Project'),
                              value:applicationDropDown,
                              isExpanded: true,

                              // style: Theme.of(context).textTheme.title,
                              //  icon: Icon(Icons.arrow_drop_down,color: Colors.lightBlue,),

                              onChanged: (String newValue) {
                                setState(() {
                                  applicationDropDown = newValue;
                                });


                              },
                              items: applicationList.cast<String>()

                                  .map<DropdownMenuItem<String>>((String value) {
                                return DropdownMenuItem<String>(
                                  value: value,
                                  child: Text(value),

                                );
                              })
                                  .toList()
                          );        */

    return SearchableDropdown.single(
    items: items,
    value: selectedValue,
    hint: "Select one",
    searchHint: "Select one",
    onChanged: (value) {
    setState(() {
      selectedValue = value;
    });
    },
    isExpanded: true,
    // label: "Select Project",

    selectedValueWidgetFn: (item) {
    return Container(
    transform: Matrix4.translationValues(-10,0,0),
    alignment: Alignment.centerLeft,
    child: (Text(item.toString())));
    },

    // style: Theme.of(context).textTheme.title,
    displayClearIcon: false,

    );
    }
    ),
    ),
    ),
    ],
    ),


    Padding(
    padding: const EdgeInsets.only(top:7.0),
    child: Row(
    mainAxisAlignment: MainAxisAlignment.start,
    children: <Widget>[
    Column(
    //  mainAxisAlignment: MainAxisAlignment.start,
    crossAxisAlignment: CrossAxisAlignment.start,
    children: <Widget>[
    new Text("Select Customer:", style: new TextStyle(fontSize: 12),),

    Container(

    height: 150,
//    width: MediaQuery.of(context).size.width/2,
    width: 150,
    decoration: ShapeDecoration(

    shape: RoundedRectangleBorder(

    side: BorderSide(width: 1.0, style: BorderStyle.solid, color: Colors.blue),
    borderRadius: BorderRadius.all(Radius.circular(5.0)),
    ),
    ),
    child: Padding(
    padding: const EdgeInsets.symmetric(horizontal:10.0),
    child: StatefulBuilder(
    //stream: null,
    builder: (BuildContext context, StateSetter setState) {
    return SearchableDropdown.single(
    items: items,
    value: selectedValue,
    hint: "Select one",
    searchHint: "Select one",
    onChanged: (value) {
    setState(() {
      selectedValue = value;
    });
    },
    isExpanded: true,
    // label: "Select Project",

    selectedValueWidgetFn: (item) {
    return Container(
    transform: Matrix4.translationValues(-10,0,0),
    alignment: Alignment.centerLeft,
    child: (Text(item.toString())));
    },


    // style: Theme.of(context).textTheme.title,
    displayClearIcon: false,

    );
    }
    ),
    ),
    ),])]))]
      )