点击拍照或相册手机没反应，打印报错
来源：6-16 拍照APP开发-图片获取与图片展示【实战尝鲜】
马健2019
2019-06-17
E/flutter (24798): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: PlatformException(already_active, Image picker is already active, null)
E/flutter (24798): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:564:7)
E/flutter (24798): #1 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:302:33)
E/flutter (24798):
E/flutter (24798): #2 ImagePicker.pickImage (package:image_picker/image_picker.dart:53:40)
E/flutter (24798):
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运行：
flutter clean
之后再试下
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