在做Flutter开发的时候，它带有热重启/重新加载的功能，但混合开发中在Android项目中集成了Flutter项目，Flutter的热重启/重新加载功能好像失效了,重启加载的步骤
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打开一个模拟器，或连接一个设备到电脑上；
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关闭我们的APP，然后运行flutter attach；
$ cd flutter_hybrid/flutter_module $ flutter attach Waiting for a connection from Flutter on Nexus 5X...
如果，你同时有多个模拟器或连接的设备，运行flutter attach会提示你选择一个设备：
ndroid SDK built for x86 • emulator-5554 • android-x86 • Android 8.1.0 (API 27) (emulator) iPhone X • 3E3FA943-715F-482F-B003-D46F5902C56C • ios • iOS 12.1 (simulator)
接下来我们需要flutter attach -d来指定一个设备： -d后面跟的设备ID。
flutter attach -d 'emulator-5554'
运行APP，然后你会看到：
$ flutter attach More than one device connected; please specify a device with the '-d' flag, or use '-d all' to act on all devices. Android SDK built for x86 • emulator-5554 • android-x86 • Android 8.1.0 (API 27) (emulator) iPhone X • 3E3FA943-715F-482F-B003-D46F5902C56C • ios • iOS 12.1 (simulator) jphdeMacBook-Pro:flutter_module jph$ flutter attach -d 'emulator-5554' Waiting for a connection from Flutter on Android SDK built for x86... Done. Syncing files to device Android SDK built for x86... 1,744ms ? To hot reload changes while running, press "r". To hot restart (and rebuild state), press "R". An Observatory debugger and profiler on Android SDK built for x86 is available at: http://127.0.0.1:60324/ For a more detailed help message, press "h". To detach, press "d"; to quit, press "q".
说明连接成功了，接下来就可以通过上面的提示来进行热加载/热重启了，在终端输入：
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r : 热加载；
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R : 热重启；
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h : 获取帮助；
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d : 断开连接；
调试Dart代码
混合开发的模式下，高效调试代码的方式：
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关闭APP
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点击AndroidStudio的Flutter Attach按钮(需要首先安装Flutter与Dart插件)
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启动APP
