In the header files of the java activity that will access NEO2, use import statement utilize the library:
The complete import list is as follows:
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.Set;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;