Use apksigner from the Android SDK build-tools to sign and zipalign the file.
Download the specific skin file (often a .uzip file) you wish to use. Download uccw495 sign apk
Use a tool like apk-signer from the Google Play Store. Use apksigner from the Android SDK build-tools to
Long-press on your home screen, select Widgets, and choose a UCCW widget size. Select the imported skin from the list. Signing an APK Download uccw495 sign apk