Signing Our App

Before we can install the app, in the emulator, we need to sign it
This means adding a cryptographic signature to the APK file
An Android device will not install an app that hasnâ€™t been signed
To sign the app, open a command prompt by clicking the Windows â€œstartâ€� button and typing â€œcmdâ€� inside the â€œsearch programs and filesâ€� box, then press enter
Type the following into the black box that appears:

Before we can install the app, in the emulator, we need to sign it