If you find that the APP signature on your phone has expired, you can uninstall and reinstall the latest version.

All Android applications require developers to use a certificate for digital signature. The Android system will not install unsigned programs. A very important role of signatures is to prevent the program from being tampered with after it is released.

Benefits of APP signature: 1. Application upgrade. If you want to upgrade the version of the application, you must sign it with the same certificate. This is because the system will only allow the installation and upgrade of the application if it is signed with the same certificate.

If the user uses a different certificate to sign, the system will ask your application to change its name, which is equivalent to installing a new application.

2. If you want to share data or code between different applications, they must run in the same process and be signed with the same certificate. . Sign multiple applications with the same certificate and use signature-based permission checking to securely share code and data between applications.

When Android installs an application, it prompts that the program is not installed due to the following reasons:

1. The same application is already installed on the phone. 2. The current mobile phone operating system does not meet the system version required by the program package. 3. The mobile phone has insufficient storage space. 4. The installation package is damaged.

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