多终端测试
flutter devices
flutter run -d emulator-5554
flutter run -d emulator-5556
自定义启动画面
之前：
进入assert 3x 生成 1x 2x
dart run flutter_native_splash:create
dart run flutter_native_splash:remove
现在（flutter_native_splash 插件 自定义启动画面）：
flutter pub run flutter_native_splash:create
flutter pub run flutter_native_splash:remove
更换小图标和应用名称
图标：
Flutter pub get
dart run flutter_launcher_icons
android 应用名称：
ios 应用名称：
