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@capgo/capgo-skills

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55 agent skills for Capacitor mobile development

github.com/Cap-go/capgo-skills

Cap-go/capgo-skills

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# Android Logs, ANRs, and Crash Data ## Capacitor tags - `Capacitor` - core bridge (`Logger` with no sub-tag). - `Capacitor/Console` - mirrored JS console: `File: <url> - Line <n> - Msg: <text>`; level follows the JS level (error/warn/others). - `Capacitor/Plugin`, `Capacitor/<Sub>` - plugin and bridge sub-tags (Capacitor's `Logger.tags(...)` joins with `/`). - `chromium` - WebView internals (noisy; mostly ignorable unless debugging WebView crashes). - `AndroidRuntime` - `FATAL EXCEPTION` stack traces for Java/Kotlin crashes. Mirroring is controlled by `loggingBehavior` (root or `android.loggingBehavior`): `debug` default = debug builds only. ## adb logcat ```bash adb logcat -c # clear buffers before reproducing adb logcat --pid="$(adb shell pidof -s com.example.app)" adb logcat -s Capacitor:V Capacitor/Console:V AndroidRuntime:E adb logcat '*:E' # errors and above, quote the glob in zsh adb logcat -e 'Capacitor|AndroidRuntime' # regex on message+tag adb logcat -b crash # crash buffer only adb logcat -b main -b system -b crash adb logcat -d -t 500 > last500.log # dump last 500 lines and exit adb logcat -T '10-10 09:30:00.000' # since a time adb logcat -v threadtime -v color # threadtime is the default format ``` Priorities: `V D I W E F S`. A filterspec is `tag:priority`; `-s` silences everything not listed. `--pid` is fixed at command start; the PID changes when the app restarts. For restart-proof filtering use Android Studio Logcat or wrap in a loop that re-resolves `pidof`. ## Android Studio Logcat (query syntax) - `package:mine` - all processes of the open project. - `package:com.example.app level:error` - `tag:Capacitor` (substring match, so it includes `Capacitor/Console`); `tag:Capacitor/Console` for JS console only. - `message:timeout`, `-tag:chromium` to exclude, `is:crash` for crashes. - Save frequently used queries as favorites; the process restart is followed automatically. ## Crashes and ANRs - Java/Kotlin crash: `adb logcat -b crash` or search `FATAL EXCEPTION`; the real cause is the last `Caused by:` block. - Release-only `ClassNotFoundException` / `NoSuchMethodError`: R8 stripped plugin classes; see `debugging-capacitor` native reference. - Native crash (`signal 11 (SIGSEGV)`): logcat shows `DEBUG` tag backtrace; full tombstones are in `/data/tombstones`, readable only on rooted/userdebug builds. On normal devices use: ```bash adb bugreport ./bugreport.zip # includes tombstones, ANR traces, dumpsys ``` - ANR (`Application Not Responding`): logcat `ActivityManager: ANR in com.example.app`; traces are inside the bugreport (`FS/data/anr/`). Typical cause: blocking work on the main thread in a plugin method; move it to a background executor. - Play Console > Android vitals shows production crashes/ANRs without an SDK. ## Other useful dumps ```bash adb shell dumpsys meminfo com.example.app adb shell dumpsys activity processes | grep com.example.app adb shell dumpsys package com.example.app | grep -A3 "runtime permissions" adb shell dumpsys webviewupdate # active WebView provider + version ```