export ANDROID_HOME=$HOME/dev/android/sdk
export NDK_HOME=$HOME/dev/android/ndk
export ANDROID_NDK_HOME=$NDK_HOME
export PATH=$PATH:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools:$NDK_HOME

export ANDROID_HOME=$HOME/dev/android/adt/sdk
export NDK_HOME=$HOME/dev/android/ndk
export ANDROID_NDK_HOME=$NDK_HOME
export PATH=$PATH:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools:$NDK_HOME
export PATH=$PATH:$ANDROID_HOME/../../android-studio/bin

Use android SDK from ADT installation, add android-studio to PATH.
Use android SDK from ADT installation, add android-studio to PATH.
