我正在尝试

launch("tel://21213123123")

但是，我收到以下错误!

PlatformException (PlatformException(error, Calling startActivity() from outside of an Activity  context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?, null))

在这个文件中

message_codecs.dart

这是我的错误日志

E/MethodChannel#plugins.flutter.io/url_launcher(26131): Failed to handle method call
E/MethodChannel#plugins.flutter.io/url_launcher(26131): android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity  context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
E/MethodChannel#plugins.flutter.io/url_launcher(26131):     at android.app.ContextImpl.startActivity(ContextImpl.java:672)
E/MethodChannel#plugins.flutter.io/url_launcher(26131):     at android.app.ContextImpl.startActivity(ContextImpl.java:659)
E/MethodChannel#plugins.flutter.io/url_launcher(26131):     at android.content.ContextWrapper.startActivity(ContextWrapper.java:331)
E/MethodChannel#plugins.flutter.io/url_launcher(26131):     at io.flutter.plugins.urllauncher.UrlLauncherPlugin.onMethodCall(UrlLauncherPlugin.java:61)
E/MethodChannel#plugins.flutter.io/url_launcher(26131):     at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:200)
E/MethodChannel#plugins.flutter.io/url_launcher(26131):     at io.flutter.view.FlutterNativeView.handlePlatformMessage(FlutterNativeView.java:163)
E/MethodChannel#plugins.flutter.io/url_launcher(26131):     at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#plugins.flutter.io/url_launcher(26131):     at android.os.MessageQueue.next(MessageQueue.java:323)
E/MethodChannel#plugins.flutter.io/url_launcher(26131):     at android.os.Looper.loop(Looper.java:135)
E/MethodChannel#plugins.flutter.io/url_launcher(26131):     at android.app.ActivityThread.main(ActivityThread.java:5468)
E/MethodChannel#plugins.flutter.io/url_launcher(26131):     at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#plugins.flutter.io/url_launcher(26131):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:781)
E/MethodChannel#plugins.flutter.io/url_launcher(26131):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:671)

最佳答案

新版本的 urlLauncher 4.0.2 插件也遇到了同样的问题

我降级到 3.0.3 并且一切正常，因此存储库中可能存在错误。

pubspec.yaml

 url_launcher: 3.0.3

示例代码(取自 git repo，但它适用于 3.0.3)

https://github.com/flutter/plugins/tree/master/packages/url_launcher

import 'package:flutter/material.dart';
import 'package:url_launcher/url_launcher.dart';

void main() {
  runApp(Scaffold(
    body: Center(
      child: RaisedButton(
        onPressed: _launchURL,
        child: Text('Show Flutter homepage'),
      ),
    ),
  ));
}

_launchURL() async {
  const url = 'https://flutter.io';
  if (await canLaunch(url)) {
    await launch(url);
  } else {
    throw 'Could not launch $url';
  }
}

有关插件的所有可用版本，请参见此处。 https://pub.dartlang.org/packages/url_launcher#-changelog-tab-

关于dart - Flutter:从 Activity 上下文外部调用 startActivity() 需要 FLAG_ACTIVITY_NEW_TASK 标志，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/53497475/