api - Flutter中从TextController或Api获取int数据时出现问题

Question

我想在 Flutter 中获取在 TextField() 中输入的 int 数据，我使用这样的 TextEditingController：

TextEditingController _section_id = new TextEditingController();

并在其中使用此控制器：

TextField(controller: _section_id,
                keyboardType: TextInputType.number,)

我以这种方式获得 int 数据：

Repository().placeAddApiProvider(int.parse(_section_id.text));

但告诉我错误：

E/flutter (25586): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: FormatException: Invalid number (at character 1)
E/flutter (25586): 
E/flutter (25586): ^
E/flutter (25586): 
E/flutter (25586): #0      int._throwFormatException (dart:core/runtime/libintegers_patch.dart:129:7)
E/flutter (25586): #1      int.parse (dart:core/runtime/libintegers_patch.dart:53:14)
E/flutter (25586): #2      AddPlaceState.build.<anonymous closure> (package:mosul/src/ui/users/add_place.dart:93:37)
E/flutter (25586): <asynchronous suspension>
E/flutter (25586): #3      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:513:14)
E/flutter (25586): #4      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:568:30)
E/flutter (25586): #5      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:120:24)
E/flutter (25586): #6      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:242:9)
E/flutter (25586): #7      TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:204:7)
E/flutter (25586): #8      GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
E/flutter (25586): #9      _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:218:20)
E/flutter (25586): #10     _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:192:22)
E/flutter (25586): #11     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:149:7)
E/flutter (25586): #12     _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:101:7)
E/flutter (25586): #13     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:85:7)
E/flutter (25586): #14     _rootRunUnary (dart:async/zone.dart:1136:13)
E/flutter (25586): #15     _CustomZone.runUnary (dart:async/zone.dart:1029:19)
E/flutter (25586): #16     _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
E/flutter (25586): #17     _invoke1 (dart:ui/hooks.dart:223:10)
E/flutter (25586): #18     _dispatchPointerDataPacket (dart:ui/hooks.dart:144:5)
E/flutter (25586): 
V/ActivityThread(25586): updateVisibility : ActivityRecord{1e7c9680 token=android.os.BinderProxy@2565abb2 {org.codeforiraq.mosul/org.codeforiraq.mosul.MainActivity}} show : false
E/OpenGLRenderer(25586): SFEffectCache:clear(), mSize = 0
W/IInputConnectionWrapper(25586): showStatusIcon on inactive InputConnection

(Repository().placeAddApiProvider) 没有问题，从 API 返回的 section_id 数据是 int，我在邮递员中尝试，一切正常吗？谢谢

标签： apiflutter

Answer 1

你的初始值TextField只是一个空字符串。试图将其解析为 anint会产生FormatException错误。

你可能想像这样重写你的代码：

if (_section_id.text.trim() != "") {
Repository().placeAddApiProvider(int.parse(_section_id.text.trim()));
}