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@@ -0,0 +1,63 @@
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+# Android tips & tricks
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+
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+## Sign the Android APK from CI
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+
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+The [Github Actions Workflow](https://github.com/minetest/minetest/actions?query=workflow%3Aandroid+event%3Apush)
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+automatically produces an APK for each architecture.
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+Before installing them onto a device they however need to be signed.
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+
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+This requires an installation of the Android SDK and `adb`.
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+```bash
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+.../android-sdk/build-tools/30.0.3/apksigner sign --ks ~/.android/debug.keystore \
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+ app-arm64-v8a-release-unsigned.apk
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+# Enter 'android' (without quotes) when asked for a password
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+```
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+
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+Note that the `debug.keystore` will not exist if you have never compiled an
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+Android app on your system (probably).
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+
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+After that installing it will work:
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+```bash
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+adb install -r -d ./app-arm64-v8a-release-unsigned.apk
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+```
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+
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+## How to get debug output from Minetest on Android
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+
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+In case debug.txt isn't enough (e.g. when debugging a crash), you can get debug
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+output using logcat:
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+
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+`adb logcat -s 'Minetest:*' '*:F'`
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+
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+Note that you can do this even *after* the app has crashed,
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+since Android keeps an internal buffer.
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+
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+A segmentation fault for example looks like this:
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+
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+```
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+01-10 17:20:22.215 19308 20560 F libc : Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 20560 (MinetestNativeT), pid 19308 (netest.minetest)
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+01-10 17:20:22.287 20576 20576 F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
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+01-10 17:20:22.287 20576 20576 F DEBUG : Build fingerprint: '...'
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+01-10 17:20:22.287 20576 20576 F DEBUG : Revision: '4'
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+01-10 17:20:22.287 20576 20576 F DEBUG : ABI: 'arm64'
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+01-10 17:20:22.288 20576 20576 F DEBUG : Timestamp: 2024-01-10 17:20:22+0100
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+01-10 17:20:22.288 20576 20576 F DEBUG : pid: 19308, tid: 20560, name: MinetestNativeT >>> net.minetest.minetest <<<
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+01-10 17:20:22.288 20576 20576 F DEBUG : uid: 10385
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+01-10 17:20:22.288 20576 20576 F DEBUG : signal 6 (SIGABRT), code -1 (SI_QUEUE), fault addr --------
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+[ ... more information follows ... ]
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+```
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+
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+If you want get rid of previous output you can do that with `adb logcat -c`.
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+
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+## I edited builtin, shaders, ... but nothing changed. Help!
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+
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+You're probably hitting two problems:
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+* the build system only generates assets once
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+* the app only re-extracts assets when the version changes
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+
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+Force regenerating the assets: `./gradlew app:clean`
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+
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+Erase the app's memory of which version was installed: `adb shell run-as net.minetest.minetest rm shared_prefs/MinetestSettings.xml`
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+
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+If this doesn't work you can also uninstall it using `adb shell pm uninstall net.minetest.minetest`. You will obviously lose your data.
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+
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+Then build and install as normal and your changes should be applied.
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sfan5