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+# Prerequisites
+
+Everything required for this can be installed through the
+prereq\_android\_sdk\_install.sh script in e-mission-phone. The most important
+packages are the emulator, platform-tools, and a system-image for your
+architecture. Use `sdkmanager --list_installed` to check installed android
+packages.
+
+Add `$ANDROID_HOME/emulator` and `$ANDROID_HOME/platform-tools` to your `$PATH`
+if they aren't already added.
+
+# Setting Up the Target
+
+Setup the android emulator or connect a phone over usb/wifi.
+
+## Android Emulator
+
+Note that the android emulator does not simulate the geofence so trips need to
+be started manually in the developer options.
+
+Create an Android Virtual Device:
+
+```
+avdmanager avd create \
+-k 'system-images;android-34;google_apis_playstore;x86_64' \
+-n <avd-name>
+```
+
+The default hardware profile can be used.
+
+Make sure to replace x86_64 if you're on a different host architecture. Use
+`sdkmanager --list` to see available architectures to install.
+
+Start the emulator:
+
+```
+emulator -avd <avd-name>
+```
+
+`adb` should connect to the emulator automatically, run `adb devices` to verify.
+
+## Real Phone
+
+Turn on developer options and enable USB debugging then plug the phone into your
+computer.
+
+# Loading the Test Application
+
+Once `adb` is connected to the test phone you can use `adb install <path to apk>`
+to install the test application.
+
+# Java Debugger
+
+Make sure developer options are enable (repeatedly tap the build number in
+settings). Go to "Select debug app" in developer options and choose the test
+app. This will start a jdwp port any time the app is launched. Run `adb jdwp` to
+get the active jdwp port.
+
+Forward the jdwp connection:
+
+```
+adb forward tcp:<unused-port> jdwp:<active-jdwp-port>
+```
+
+Anytime the app is relaunched it will create another jdwp connection so these
+two commands need to be run again.
+
+## CLI
+
+```
+jdb -attach localhost:<forwarded-port> -sourcepath <phone-repo>/platforms/android/app/src/main/java
+```
+
+[Tutorial for jdb](https://m.opnxng.com/@dmytro.ch/the-java-debugger-how-to-debug-java-without-ide-how-to-use-jdb-ef732d79f915)
+
+## VSCode
+
+Install the [Language Support for Java](https://marketplace.visualstudio.com/items?itemName=redhat.java) and the [Debugger for Java](https://marketplace.visualstudio.com/items?itemName=vscjava.vscode-java-debug)
+extensions.
+
+Configure the `launch.json` file to attach to the forwarded jdwp port.
+
+```json
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "java",
+            "name": "Current File",
+            "request": "attach",
+            "hostName": "localhost",
+            "port": <forwarded-port>,
+        }
+    ]
+}
+```
+
+Start the debugger from the "Run and Debug" tab.
+
+## Emacs
+
+Install [lsp-mode](https://emacs-lsp.github.io/lsp-mode/), [dap-mode](https://github.com/emacs-lsp/dap-mode), and [lsp-java](https://github.com/emacs-lsp/lsp-java).
+
+Required config:
+
+```elisp
+(use-package lsp-mode
+  :init
+  (setq lsp-keymap-prefix "C-c l")
+  :commands lsp)
+
+(use-package dap-mode)
+
+(use-package lsp-java
+  :config (add-hook 'java-mode-hook 'lsp))
+```
+
+Navigate to a java file in the phone repo. Lsp-mode will ask to set the project
+root, make sure to set it to the root of the java code
+(`platforms/android/app/src/main/java`) and not the root of the phone repo.
+
+Verify that `jdtls` is installed by running `lsp-install-servers` and selecting
+`jdtls`
+
+Run `dap-debug` and select "Java Attach" then enter the port for the jdwp
+connection.
+