apksigner sign --ks path/to/your/key.jks --ks-pass pass:your_key_password --ks-keyalg RSA --ks-keysize 2048 --validity 10000 --v1-signing-enabled true --v2-signing-enabled true --v3-signing-enabled true --v4-signing-enabled true your_apk_file.apk
Converting XAPK to APK is trivial once the format is understood as a ZIP archive with a manifest. We provide a robust extraction protocol and reference implementation. convert xapk to apk