xocko/plexamp-lite
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Sign APK in classic SignApk format so it installs on Android <= 4.2

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Replace jarsigner + zipalign.py with tools/signapk.py, which writes the v1
signature the way old JarUtils expects and aligns the APK.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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xockoandClaude Opus 5.5 committed 2026-10-14 19:46:20 +02:00
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commit 948d1198ad
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README.md
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@@ -72,8 +72,10 @@ tools/setup_toolchain.sh # once: fetches aapt2, the API 8 android.jar, buil
```
`build.sh` runs `aapt2` (resources), `javac` (Java 8 bytecode checked against the API 8
`android.jar`), `dx` (dex 035), `jarsigner` (v1 signature with SHA-1, which Android < 4.3 requires)
and `tools/zipalign.py`. The debug key in `signing/` (password `minamp123`) is what this APK is
`android.jar`), `dx` (dex 035) and `tools/signapk.py`, which writes the v1 signature in the
classic Android SignApk format and aligns the APK. (Modern `jarsigner` output does *not* install on
Android 4.2 and older: it names digests `SHA-1-Digest` and labels the PKCS#7 signer algorithm in a
way old `JarUtils` can't read, so the phone treats the APK as unsigned.) The debug key in `signing/` (password `minamp123`) is what this APK is
signed with, so rebuilt APKs install over it.
Tests (desktop JVM, no device):