System.getenv(String name) : Returns the value of the environment variable with the given name .
Parameter : name -> the name of the environment variable.
How to know all of the environment variables:
Enter adb shell command line . Then key in "export" and you will get all of the environment variables.
By the way, if you want to add a environment variable,you just key in "exprot variable-name="variable-value" ".
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