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Amend Android dev documentation

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sfan5 2024-02-18 15:23:37 +01:00
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doc/developing/misc.md
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# Miscellaneous
## Sign the Android APK from CI
The [Github Actions Workflow](https://github.com/minetest/minetest/actions?query=workflow%3Aandroid+event%3Apush)
automatically produces an APK for each architecture.
Before installing them onto a device they however need to be signed.
This requires an installation of the Android SDK and `adb`.
```bash
.../android-sdk/build-tools/30.0.3/apksigner sign --ks ~/.android/debug.keystore \
app-arm64-v8a-release-unsigned.apk
# Enter 'android' (without quotes) when asked for a password
```
Note that the `debug.keystore` will not exist if you have never compiled an
Android app on your system (probably).
After that installing it will work:
```bash
adb install -r -d ./app-arm64-v8a-release-unsigned.apk
```
## How to get debug output from Minetest on Android
In case debug.txt isn't enough (e.g. when debugging a crash), you can get debug
output using logcat:
`adb logcat -s 'Minetest:*' '*:F'`
Note that you can do this even *after* the app has crashed,
since Android keeps an internal buffer.
A segmentation fault for example looks like this:
```
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)
01-10 17:20:22.287 20576 20576 F DEBUG : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
01-10 17:20:22.287 20576 20576 F DEBUG : Build fingerprint: '...'
01-10 17:20:22.287 20576 20576 F DEBUG : Revision: '4'
01-10 17:20:22.287 20576 20576 F DEBUG : ABI: 'arm64'
01-10 17:20:22.288 20576 20576 F DEBUG : Timestamp: 2024-01-10 17:20:22+0100
01-10 17:20:22.288 20576 20576 F DEBUG : pid: 19308, tid: 20560, name: MinetestNativeT >>> net.minetest.minetest <<<
01-10 17:20:22.288 20576 20576 F DEBUG : uid: 10385
01-10 17:20:22.288 20576 20576 F DEBUG : signal 6 (SIGABRT), code -1 (SI_QUEUE), fault addr --------
[ ... more information follows ... ]
```
## Profiling Minetest on Linux
We will be using a tool called "perf", which you can get by installing `perf` or `linux-perf` or `linux-tools-common`.