Building

To build:

git clone https://github.com/microg/android_packages_apps_FakeStore.git
cd android_packages_apps_FakeStore
./gradlew build
cd fake-store/build/outputs/apk/
#now you need to sign the apk file and zipalign it for installation on a phone
jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore </path/to/android/kesytore/file.jks> fake-store-release-unsigned.apk  <your signing key name here>
</path/to/android/sdk/installation>/build-tools/22.0.1/zipalign -v 4 fake-store-release-unsigned.apk fake-store-release-signed-zipaligned.apk

Then sideload and install to your phone!