Environment variables for Android development

ANDROID_HOME
Deprecated (in Android Studio), use ANDROID_SDK_ROOT instead.

ANDROID_SDK_ROOT

Installation directory of Android SDK package.
Example: C:AndroidSDK or ~/android-sdk/

ANDROID_NDK_ROOT

Installation directory of Android NDK package. (WITHOUT ANY SPACE)
Example: C:AndroidNDK or ~/android-ndk/

ANDROID_SDK_HOME

Location of SDK related data/user files.
Example: C:Users<USERNAME>.android or ~/.android/

ANDROID_EMULATOR_HOME

Location of emulator-specific data files.
Example: C:Users<USERNAME>.android or ~/.android/

ANDROID_AVD_HOME

Location of AVD-specific data files.
Example: C:Users<USERNAME>.androidavd or ~/.android/avd/

JDK_HOME and JAVA_HOME

Installation directory of JDK (aka Java SDK) package.
Note: This is used to run Android Studio(and other Java-based applications). Actually when you run Android Studio, it checks for JDK_HOME then JAVA_HOME environment variables to use.

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