Android View signature information

• Open cmd and enter the command: keytool -list -v -keystore key file path
• Enter key password
  
• If it prompts [keytool is not an internal or external command]
  • The first solution: cmd command to switch to the bin directory to view the signature
    
  • The second solution: the path of the system environment variable configured in the keytool.exe path under jdk.