Sign and align an Android APK

signalign

#!/bin/sh
#
# Automates signing and aligning Android APKs as per
# http://developer.android.com/tools/publishing/app-signing.html#signing-manually
#
# USAGE: signalign platforms/android/build/outputs/apk/android-release-unsigned.apk
#
set -e

# configure the next two properties for your own certificate
KEYSTORE_PATH="$HOME/path/to/your/android-release.keystore"
KEY_ALIAS="your-key-alias"

UNSIGNED_APK="$1"
APK_NAME="$(basename "$UNSIGNED_APK" -unsigned.apk)"
TARGET_DIR="$(dirname $UNSIGNED_APK)"
SIGNED_APK="$TARGET_DIR/$APK_NAME-signed.apk"
SIGNED_ALIGNED_APK="$TARGET_DIR/$APK_NAME-signed-aligned.apk"

BUILD_TOOLS_VERSION="$(ls -1 "$ANDROID_HOME/build-tools" | tail -n 1)"
ZIPALIGN="$ANDROID_HOME/build-tools/$BUILD_TOOLS_VERSION/zipalign"

echo "Signing: $SIGNED_APK"
cp "$UNSIGNED_APK" "$SIGNED_APK"
jarsigner -sigalg MD5withRSA -digestalg SHA1 \
  -keystore "$KEYSTORE_PATH" "$SIGNED_APK" "$KEY_ALIAS"

echo "Aligning: $SIGNED_ALIGNED_APK"
rm -f "$SIGNED_ALIGNED_APK"
$ZIPALIGN -v 4 "$SIGNED_APK" "$SIGNED_ALIGNED_APK"

echo "All done. Your final APK is $SIGNED_ALIGNED_APK"