错误：Could not locate aapt. Please ensure you have the Android buildtools installed. No application found for TargetPlatform.android_arm64. Is your project missing an android/app/src/main/AndroidManifest.xml? Consider running "flutter create ." to create one.
解决：
1.安装build-tools(如果已经安装则忽略此步)
Android Studio的Tools->SDK Manager->Android SDK->SDK Tools， 勾选上Android SDK Build-Toos，Apply并安装
2.启动cmd，用flutter doctor检查， 如果提示未接受许可证，则按提示输入flutter doctor --android-licenses命令接受许可证，一路输入y并确认，问题解决
