遇到的问题
1 Unable to locate a development device; please run 'flutter doctor' for infor
里面有这么一条回答：（设置解决 ，前提 是使用flutter doctor 所有条件都已经满足了）
In Android Studio, ensure that the API level of your Project SDK (File->Project Structure) <= of the API level of your AVD.
一 环境变量配置
~/.bashrc 中的配置：
flutter PATH
export FLUTTER_PATH="/opt/flutter"
java PATH
export JAVA_HOME="/opt/java/jdk1.8.0_181"
sdk PATH
export ANDROID_HOME="/opt/sdk"
export PATH="{JAVA_HOME}/bin:
ANDROID_HOME:
ANDROID_HOME/tools:$ANDROID_HOME/platform-tools"
二 Android studio 安装 dart 和flutter plugin
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