AndroidStudioAVD未检测到JRE-AndroidStudioAVDnotdetectingJRE

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Since it is not a shell script you can not write any shell variable with '$' sign. You have to just concatenate (using ':' operator) the JAVA_HOME/bin directory in your /etc/environment file like this -

由于它不是shell脚本,因此您无法使用'$'符号编写任何shell变量。你必须在/ etc / environment文件中连接(使用':'运算符)JAVA_HOME / bin目录,如下所示 -

JAVA_HOME=/user/local/jdk1.8.0_45
PATH="/usr/local/bin:/usr/sbin:/usr/bin:/user/local/jdk1.8.0_45/bin"

export JAVA_HOME #invalid in /etc/environment; don't place export here
export PATH #invalid in /etc/environment; don't place export here  

From in /etc/environment you don't need to export the environment variables.

在/ etc / environment中,您不需要导出环境变量。

Note: export is invalid in /etc/environment since it is not a shell/bash file. /etc/environment/ is just a configuration file which is read by the OS during boot and all setting is loaded in that time. And finally the configuration written int /etc/environment will be applicable for all over the environment and for all users.

注意:导出在/ etc / environment中无效,因为它不是shell / bash文件。 / etc / environment /只是一个配置文件,在启动过程中由OS读取,并且在此时加载所有设置。最后,编写int / etc / environment的配置将适用于整个环境和所有用户。

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I suggest you to install Open JDK from Ubuntu software center and then you don't need to do any path operations.

我建议你从Ubuntu软件中心安装Open JDK,然后你不需要做任何路径操作。