trying out clj-android sample

notes.md

steps

jdk, android sdk, etc.

• make sure jdk 21+ (<26) is installed

  $ java --version
  openjdk 21.0.10 2026-01-20
  OpenJDK Runtime Environment (build 21.0.10+7-Ubuntu-124.04)
  OpenJDK 64-Bit Server VM (build 21.0.10+7-Ubuntu-124.04, mixed mode, sharing)
  

• download cmdline-tools from https://developer.android.com/studio#command-tools (at time of writing, checksum was mentioned as sha-256, but in fact was md5). file's name likely something like: commandlinetools-linux-14742923_latest.zip.

  $ sha256sum commandlinetools-linux-14742923_latest.zip 
  04453066b540409d975c676d781da1477479dde3761310f1a7eb92a1dfb15af7  commandlinetools-linux-14742923_latest.zip
  $ shasum commandlinetools-linux-14742923_latest.zip 
  48833c34b761c10cb20bcd16582129395d121b27  commandlinetools-linux-14742923_latest.zip
  

• set some environment variables (hint: place in file and use source on it when needed)

  export ANDROID_HOME=$HOME/android
  export ANDROID_SDK_ROOT=$ANDROID_HOME
  export PATH=$ANDROID_HOME/cmdline-tools/latest/bin:$ANDROID_HOME/platform-tools:$PATH
  

• mkdir $ANDROID_HOME

• unzip commandlinetools-linux-14742923_latest.zip - this should produce a directory named cmdline-tools. rename it to latest and place it in a directory named cmdline-tools (probably need to create it) under $ANDROID_HOME, i.e. $HOME/android/cmdline-tools/latest is where the content within the uncompressed result directory (originall cmdline-tools) shoudl end up. yeah, complicated, seems like this is google's doing.

• try sdkmanager --list to make sure things work. if not, confirm instructions above were followed or find other fix.

• install build-tools 35.0.1: sdkmanager "build-tools;35.0.1"

• install platform 35: sdkmanager "platforms;android-35"

clj-android sample

• clone sample...but use a different name:

  cd ~/src && git clone https://github.com/clj-android/sample clj-android-sample
  

• cd clj-android-sample

• build debug apk: ./gradlew assembleDebug

• install apk: ./gradlew installDebug

• launch the apk (can be via adb or directly on the device)

• connect android device with dev mode enabled and usb debugging set (or make appropriately setup emulator available)

• make it possible for an nrepl connection from host to android device:

  adb forward tcp:7888 tcp:7888
  

• connect via nrepl (e.g. using cider's cider-connect-clj / C-c M-c to localhost 7888)

• try the following code -- success should result in main activity window looking different:

  (require '[com.example.clojuredroid.main-activity :as ui])
  
  (reset! ui/ui-tree*
    [:linear-layout {:orientation :vertical :padding [32 32 32 32]}
      [:text-view {:text "Modified from REPL!" :text-size [24 :sp]}]])
  
  (ui/reload-ui!)

references

• https://github.com/clj-android/sample
• https://gist.github.com/gugadev/1a4e18b6f2fcd82332e3bac59c10738c
• https://www.virustotal.com/gui/file/04453066b540409d975c676d781da1477479dde3761310f1a7eb92a1dfb15af7/details