Android Studio runtime signature needs to specify the signature file when it is allowed or when the apk file is generated. To change the signature file, the developer needs to generate it for the first time, and then reuse it to generate the signature file:

Android Studio menu "build->; Generate a signed APK "

"Create New ..." Creates a signature file for the current application. When filling in the basic information, developers need to remember: keystore password, keystore alias, keystore alias password.

The signature file is the only sign of the application. If it is placed in the third-party Android market, it must be a contracted application, and developers need to take good care of it.

You can use it repeatedly every time in the future. "Select Exit ..." Select the locally saved signature file, enter the corresponding alias and password, and execute "Next".

You can customize the signature every time you run the application in the future (Android Studio comes with the signature by default).