All Android applications require developers to digitally sign with certificates. Android system will not install unsigned programs, and signature plays a very important role in preventing programs from being tampered with after release.
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, because the system will only allow you to install and upgrade this application if you sign it with the same certificate.
If users sign with different certificates, the system will ask your application to change its name, which is equivalent to installing a new application.
2. If different applications want to share data or code, they should run in the same process and sign with the same certificate. By signing multiple applications with the same certificate, code and data can be safely shared between applications by using signature-based permission check.
When installing an application on Android, the prompt will not be installed for the following reasons:
1. The same application is installed on the mobile phone. 2. The current mobile phone operating system does not meet the system version required by the package. 3. The storage space of the mobile phone is insufficient. 4. The installation package has been damaged.
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