My notes on the Google/Asus nexus 7 2012 “grouper”, 16GB.

CPU: ARM Cortex-A9, 4x 1.20GHz (nVIDIA Tegra 3) • RAM: 1GB • 16GB Flash • Grafik: nVIDIA 12 GeForce ULP (IGP) • Display: 7“, 1280×800 • connectors: 1x USB 2.0 (Micro-USB) • Wireless: WLAN 802.11bgn, Bluetooth 3.0, GPS • Webcam: 1.2 Megapixel • OS: Android 4.1 • Akku: Li-Polymer, 4325mAh, 9.5h • wight: 0.34kg • size: 198.5x120x10.45mm • sensors: Kompass, Gyroskop, Lagesensor, Lichtsensor, NFC

Applications you should try out:

• Airdroid: remote control of the Nexus7 using a webbrowser via wlan, allows also file uploads. Impressive.
• SSHDroid: mount the Nexus 7 filesystems on your linux box
• media player:
  • VLC/VideoLanClient: for playing media files
  • MX Player
• AmigaUAE: great to Supercars2 or Turrican on this device
• SIP applications:
  • CSipSimple: settled with this one
  • mizudroid: also usable DTMF
• japanese specific:
  • google translate: recognizes spoken or drawn content
  • Kanji Recognizer: can work offline, recognize kanji if stroke order is correct
  • iknow: for japanese learning
  • wwwjdic: frontent application for kanji recognition
  • AEdict: kanji application using Jim Breen's EDICT data
• offline map
  • City Maps 2 go (5 maps free)
  • ForeverMap 2 (0.79€ incl. 1 map)
  • Google Maps (japan not offline available)
  • here.maps
  • Maps(-)
  • Maps with me!
  • MapDroyd
  • Orux.Maps
  • OsmAnd

Newer android devices are no longer usable as usb mass device on linux, those devices keep the storage mounted at all time for themself. My goals for file access:

• should not require many changing commands (i.e. changing device names)
• should offer all files/directories on the storage as a mountable filesystem
• bonuspoints for:
  • beeing fast
  • beeing secure against eavesdropping

• Valid solutions for me
  • ssh daemon (thanks Matěj Cepl for idea)
    • pro: easy, needs no rooting, encrypted connection
    • con: slower (I should tune the sync encryption options)
    • very nice, SSHDroid as sshd. Allows setup of ssh pubkeys and mounting via sshfs: 'sshfs -p 2222 root@192.168.0.21:/storage/sdcard0/ /mnt/nexus7/'
    • 1.8Mbyte/sec via wlan
  • FTP server
    • con: ftp was not build to be used like a filesystem
    • with ftpfs should present a filesystem
  • Samba server
    • pro: lower cpuload/better throughput than ssh
    • con: requires rooting of the Nexus 7
    • install application 'Samba Filesharing'
  • simple-mtpfs
    • pro: faster than ssh/wireless
    • con: needs the usb cable
    • On Fedora21: 'yum -y install simple-mtpfs; simple-mtpfs /mnt/nexus7'
• The following ways did not provide me with a mountable & usable filesystem:
  • Android SDK tools: con: no mounted filesystem. 'yum -y install android-tools.x86_64; adb start-server; adb push file /sdcard/Movies'
  • Airdroid application: pro: remote control of the Nexus7 using a webbrowser via wlan, allows also file uploads. Impressive.
  • PTP protocol: presents the Nexus 7 with the picture protocol, just few files/directories are accessable.
  • Using extra hardware: USB OnTheGo (OTG, http://en.wikipedia.org/wiki/USB_On-The-Go ) the cable can act as USB host:
    • non-rooted tablet, Nexus Media Importer application
    • rooted tablet: stickmount application
    • https://play.google.com/store/apps/details?id=com.homeysoft.nexususb.viewer
    • https://play.google.com/store/apps/details?id=com.homeysoft.nexususb.importer&hl=en
    • https://play.google.com/store/apps/details?id=com.estrongs.android.pop

• adb install <file.apk>
• install twrp-3.2.1-0-grouper.img as boot manager
• cm-13.0-20160816-UNOFFICIAL-grouper.zip is a usable android 6 based rom (android7 based ones also exist)
• open_gapps-arm-6.0-pico-20180630.zip is to big

• http://blog.delouw.ch/2012/09/09/how-to-transfer-files-to-the-google-nexus-7/ – thanks Luc
• https://developers.google.com/android/nexus/images#nakasi – google factory images: “nakasi”