Instructions:
Open the project in Android Studio. (If it complains that it Failed to find target which has string 'android-22' or another version, use the provided link to Open Android SDK Manager and check the box for the missing version and then press the OK button to download and install it, then restart the project.) (If it complains about failed to find Build Tools revision 23.0.0 or another version, use the Install Build Tools 23.0.0 and sync project link to get them.)
Run the assembleDebug gradle task. (If you cannot find assembleDebug, select Build/Make Project from the menu, and then Build/Build APK. This places app-debug.apk into the app/build/outputs/apk directory.)
Install /app/build/outputs/apk/app-debug.apk with adb: (The adb program will be in your sdk directory, whose location you can find by opening Tools/Android/SDK Manager and then looking in the Android SDK Location: box. For user taylorr on one computer, it was at C:\Users\taylorr\AppData\Local\Android\sdk\platform-tools. You probably want to add this to your path and then restart Android Studio.)
adb install app-debug.apk
Copy the OSVR server binaries for OSVR-Android to /data/local/tmp/osvr
adb push C:\path\to\OSVR-Android-Build-Install /data/local/tmp/osvr
Run the following commands:
adb shell
cd /data/local/tmp/osvr/bin
chmod 775 osvr_server
run-as com.osvr.serverlauncher
mkdir files
cp -R /data/local/tmp/osvr/* files
Now launch the app, wait a bit, then switch out and launch your OSVR app.