要改动的文件是~/bash_profile这个配置文件，内容例如以下：

# Setting PATH for Java

JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home"

CLASS_PATH="$JAVA_HOME/lib"

# Setting PATH for Python 3.4

PYTHON_HOME="/Library/Frameworks/Python.framework/Versions/3.4/bin"

# Setting PATH for Android

ANDROID_HOME="~/Library/Android/sdk"

# Construct full path

PATH="/usr/local/bin:$JAVA_HOME/bin:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools:$PYTHON_HOME:$PATH"

# Export all path for base

export PATH JAVA_HOME CLASS_PATH ANDROID_HOME

亲測通过，可用。