The Android Native Development Kit (NDK) - Beginning Android 3D Game Development - page 402

First, we have to create the jni directory for the Android project. Select the main project directory
that you want to create the jni directory in. Go to File ➤ New ➤ Folder to bring up the New Folder
dialog window. Enter the file name “jni” in the Folder name edit box and click the Finish button to
create a new directory named jni . (See Figure 11-5 .)
Figure 11-5. New Folder window dialog
The jni directory should appear under the main project directory. (See Figure 11-6 .)