canvas - 神秘 flutter 警告 : Element is implicitly hidden?

Question

警告:

Element 'TextStyle' from SDK library 'ui.dart' is implicitly hidden by 'text_style.dart'.

代码摘录:

 import 'dart:math';
 import 'dart:ui';
 import 'package:flutter/material.dart';

@override
void paint(Canvas canvas, Size size) {
    TextSpan span = new TextSpan(style: new TextStyle(color: Colors.blue[800], fontSize: 12.0,), text: "Title");
    TextPainter tp = new TextPainter(text: span, textAlign: TextAlign.left, textDirection: TextDirection.ltr);
    tp.layout();
    tp.paint(canvas, new Offset(50.0, 300.0));

现在这是一个警告，而不是错误，但我不知道这条消息的含义。有人知道怎么翻译吗？此隐式隐藏 警告消息是什么意思？

Answer 1

一个(希望)澄清答案以供将来引用。

您至少有两个选项来解决导入冲突(在多个导入中名称相同并且它们相互遮蔽)。

1. 使用命名导入前缀 as
2. 使用隐藏关键字

例子:导入 dart:ui 可能会导致 TextStyles 冲突(TextStyle 类存在于 flutter Material 包和 dart ui 库中)

解决方案:

1.

import 'dart:ui' as ui;
import 'package:flutter/material.dart';
// prefix your use of the ui library with ui (material TextStyle no longer shadowed)
...
ui.TextStyle(... // from dart:ui
ui.ImageFilter(... // from dart:ui
TextStyle(... // from flutter/material

2.

import 'dart:ui' hide TextStyle;
import 'package:flutter/material.dart';
// hiding the TextStyle from ui lib (material TextStyle no longer shadowed)
...
TextStyle(... // from flutter/material
ImageFilter(... // from dart:ui