Flutterエラーと解決策
8676 ワード
Flutterの使用で発生した問題:1,Expected a key while parsing a block mapping
異常原因:assetsの前にスペースソリューションが追加されました:assetsの前のスペースを除去し、全体のラベルの位置合わせに注意してください2、RichText widgets require a Directionality widget ancestor.奇妙な間違いです.昨日はこのような問題はありませんでしたが、今日は次のようになりました.
今まで何が起こったのか分からなかった.解決策は次のとおりです.
重要なのは次のコードです:(不明覚)textDirection:TextDirection.ltr 3,TextField widgets require a Material widget ancestor.
TextField widgetはScaffold widgetに包まれる必要があります.そうしないと、textfield widgets require a material widget ancestor 4、No MediaQuery ancestor could be found starting from the context that was passed to MediaQuery.of()
原因は、main.dartのrunAppから直接StatefulWidgetにジャンプし、このStatefulWidgetはScaffold 5、Finished with error:FormatException:Bad UTF-8 encoding 0 xe 4(at offset 9)を返します.これはappのバージョンがreleaseのためkeystoreファイルが見つからないためです.
Android–app–build.gradleのsigningConfigsが正しいかどうかを確認します6、Because xxx requires K SDversion 2.0.0-dev.68.0、version solving failed.FlutterエラーgithubのFlutterプロジェクトをダウンロードし、実行後、次のエラーを報告します
文字通り、Dartのバージョンは2.0ですが、プロジェクトには2.0より大きいDartバージョンが必要です.このエラーの原因は、依存するパッケージ、または自分のプロジェクト自体が高バージョンのdartを使用しているためです.私の解決策は、Android Studio–Tools–Flutter–Flutter Upgradeの実行結果は次の通りです(ログが縮小されました)
実行後、赤いヒントが消えていることに気づきました.この時runプロジェクトができて、プロジェクトがパッケージをダウンロードしていることに気づきました.「Dart Packages/Dart SDK/Flutter Plugins」などのSDKパッケージが初めて稼働するのはもちろん、手動でFlutterをダウンロードする方法もあります.ダウンロード先は次のとおりです.https://github.com/flutter/flutter
Error on line 30, column 4 of pubspec.yaml: Expected a key while parsing a block mapping.
assets:
^
異常原因:assetsの前にスペースソリューションが追加されました:assetsの前のスペースを除去し、全体のラベルの位置合わせに注意してください2、RichText widgets require a Directionality widget ancestor.奇妙な間違いです.昨日はこのような問題はありませんでしたが、今日は次のようになりました.
I/flutter (20611): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (20611): The following assertion was thrown building Text("xxx", inherit: true, color: Color(0xff2b6dea),
I/flutter (20611): size: 22.0):
I/flutter (20611): No Directionality widget found.
I/flutter (20611): RichText widgets require a Directionality widget ancestor.
I/flutter (20611): The specific widget that could not find a Directionality ancestor was:
I/flutter (20611): RichText(softWrap: wrapping at box width, maxLines: unlimited, text: "xxx")
I/flutter (20611): The ownership chain for the affected widget is:
I/flutter (20611): RichText ← Text ← Column ← Padding ← DecoratedBox ← Container ← Login ← [root]
I/flutter (20611): Typically, the Directionality widget is introduced by the MaterialApp or WidgetsApp widget at the
I/flutter (20611): top of your application widget tree. It determines the ambient reading direction and is used, for
I/flutter (20611): example, to determine how to lay out text, how to interpret "start" and "end" values, and to resolve
I/flutter (20611): EdgeInsetsDirectional, AlignmentDirectional, and other *Directional objects.
今まで何が起こったのか分からなかった.解決策は次のとおりです.
：
@override
Widget build(BuildContext context) {
return Container(
color: Color(0xFFFFFFFF),
padding: EdgeInsets.fromLTRB(0.0, 78.0, 0.0, 5.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Image.asset("images/logo.png", width: 48.0, ),
new Container(height: 5.0),
Text(
"Helloword",
style: TextStyle(
color: Color(0xFF2B6DEA),
fontSize: 22.0,
),
),
],
),
);
}
：
@override
Widget build(BuildContext context) {
return Container(
color: Color(0xFFFFFFFF),
padding: EdgeInsets.fromLTRB(0.0, 78.0, 0.0, 5.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Image.asset("images/logo.png", width: 48.0, ),
new Container(height: 5.0),
Text(
"Helloword",
style: TextStyle(
color: Color(0xFF2B6DEA),
fontSize: 22.0,
),
textDirection: TextDirection.ltr
),
],
),
);
}
重要なのは次のコードです:(不明覚)textDirection:TextDirection.ltr 3,TextField widgets require a Material widget ancestor.
I/flutter (20611): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (20611): The following assertion was thrown building TextField(decoration: InputDecoration(hintText:
I/flutter (20611): " ", prefixIcon: Icon(IconData(U+0E7FD))), autofocus: true, autocorrect: true, max length
I/flutter (20611): enforced, onTap: null, dirty, state: _TextFieldState#8027d):
I/flutter (20611): No Material widget found.
I/flutter (20611): TextField widgets require a Material widget ancestor.
I/flutter (20611): In material design, most widgets are conceptually "printed" on a sheet of material. In Flutter's
I/flutter (20611): material library, that material is represented by the Material widget. It is the Material widget
I/flutter (20611): that renders ink splashes, for instance. Because of this, many material library widgets require that
I/flutter (20611): there be a Material widget in the tree above them.
I/flutter (20611): To introduce a Material widget, you can either directly include one, or use a widget that contains
I/flutter (20611): Material itself, such as a Card, Dialog, Drawer, or Scaffold.
I/flutter (20611): The specific widget that could not find a Material ancestor was:
I/flutter (20611): TextField(decoration: InputDecoration(hintText: " ", prefixIcon: Icon(IconData(U+0E7FD))),
I/flutter (20611): autofocus: true, autocorrect: true, max length enforced, onTap: null)
I/flutter (20611): The ancestors of this widget were:
I/flutter (20611): Column(direction: vertical, mainAxisAlignment: start, crossAxisAlignment: center)
I/flutter (20611): Padding(padding: EdgeInsets(0.0, 78.0, 0.0, 5.0))
I/flutter (20611): DecoratedBox(bg: BoxDecoration(color: Color(0xffffffff)))
I/flutter (20611): Container(padding: EdgeInsets(0.0, 78.0, 0.0, 5.0), bg: BoxDecoration(color: Color(0xffffffff)))
I/flutter (20611): Login
I/flutter (20611): [root]
TextField widgetはScaffold widgetに包まれる必要があります.そうしないと、textfield widgets require a material widget ancestor 4、No MediaQuery ancestor could be found starting from the context that was passed to MediaQuery.of()
I/flutter (20611): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter (20611): The following assertion was thrown building Login:
I/flutter (20611): MediaQuery.of() called with a context that does not contain a MediaQuery.
I/flutter (20611): No MediaQuery ancestor could be found starting from the context that was passed to MediaQuery.of().
I/flutter (20611): This can happen because you do not have a WidgetsApp or MaterialApp widget (those widgets introduce
I/flutter (20611): a MediaQuery), or it can happen if the context you use comes from a widget above those widgets.
I/flutter (20611): The context used was:
I/flutter (20611): Scaffold(dirty, state: ScaffoldState#9a79e(lifecycle state: initialized, tickers: tracking 1
I/flutter (20611): ticker))
原因は、main.dartのrunAppから直接StatefulWidgetにジャンプし、このStatefulWidgetはScaffold 5、Finished with error:FormatException:Bad UTF-8 encoding 0 xe 4(at offset 9)を返します.これはappのバージョンがreleaseのためkeystoreファイルが見つからないためです.
Finished with error: FormatException: Bad UTF-8 encoding 0xe4 (at offset 9)
Android–app–build.gradleのsigningConfigsが正しいかどうかを確認します6、Because xxx requires K SDversion 2.0.0-dev.68.0、version solving failed.FlutterエラーgithubのFlutterプロジェクトをダウンロードし、実行後、次のエラーを報告します
The current Dart SDK version is 2.0.0-dev.58.0.flutter-f981f09760.
Because sample_catalog requires SDK version >=2.0.0-dev.68.0 <3.0.0, version solving failed.
文字通り、Dartのバージョンは2.0ですが、プロジェクトには2.0より大きいDartバージョンが必要です.このエラーの原因は、依存するパッケージ、または自分のプロジェクト自体が高バージョンのdartを使用しているためです.私の解決策は、Android Studio–Tools–Flutter–Flutter Upgradeの実行結果は次の通りです(ログが縮小されました)
Upgrading Flutter from C:\Users\Hzx\flutter...
From https://github.com/flutter/flutter
c7ea3ca377..5391447fae beta -> origin/beta
* [new branch] gallery -> origin/gallery
* [new branch] maryx-animated-container -> origin/maryx-animated-container
5413560415..aca3aba10e master -> origin/master
* [new branch] stable -> origin/stable
* [new tag] v1.1.5 -> v1.1.5
Checking out files: 10% (239/2211)
Checking out files: 100% (2211/2211), done.
Updating c7ea3ca377..5391447fae
.../app/src/main/res/mipmap-mdpi/ic_launcher.png | Bin
.../android}/gradle.properties | 0
.../src/main/res/mipmap-hdpi/ic_launcher.png | Bin 0 -> 544 bytes
.../common}/.idea/modules.xml.tmpl | 0
.../LaunchImage.imageset/[email protected] | Bin 0 -> 68 bytes
2140 files changed, 204402 insertions(+), 95793 deletions(-)
mode change 100644 => 100755
Upgrading engine...
Checking Dart SDK version...
Downloading Dart SDK from Flutter engine 7375a0f414bde4bc941e623482221db2fc8c4ab5...
Unzipping Dart SDK...
Building flutter tool...
Running pub upgrade...
Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure you trust this source!
Downloading package sky_engine... 0.6s
Downloading common tools... 1.8s
実行後、赤いヒントが消えていることに気づきました.この時runプロジェクトができて、プロジェクトがパッケージをダウンロードしていることに気づきました.「Dart Packages/Dart SDK/Flutter Plugins」などのSDKパッケージが初めて稼働するのはもちろん、手動でFlutterをダウンロードする方法もあります.ダウンロード先は次のとおりです.https://github.com/flutter/flutter