我也遇到了同样的问题。我选择位置C:\Program Files (x86)\Android\ android-studio\plugins\gradle作为gradle Home

在Arch Linux上我找不到它，所以我添加了:

echo $APP_HOME

到/usr/bin/grade(在哪个gradle上找到)

安装目录是/usr/share/java/gradle/

如果你使用MacPorts gradle的主页是:

/opt/local/share/java/gradle

在Linux Mint 17上是这样的

/usr/share/gradle

对我来说

我用umake安装android studio。对我来说，这条路是

/home/user/.local/share/umake/android/android-studio/gradle/gradle-2.14.1

Mac OSX / Linux

Step 1: Open terminal :)
Step 2: Open .bash_profile in vim to edit: 
        > vi ~/.bash_profile 
Step 3: Add line: 
        > export GRADLE_HOME=/usr/local/opt/gradle 
        (for me it was this location, it can be different for u)
Step 4: Add line: 
        > export PATH="$PATH:$GRADLE_HOME/bin" 
        (to export bin directory of gradle)
Step 5: Verify by reopening the terminal or new tab, and check by echoing: 
        > echo $GRADLE_HOME