You should Perform input validation when handling data from external storage as you would with data from any untrusted source.

You should not store executables or class files on external storage prior to dynamic loading.

Content providers can also provide more granular access by declaring the argument is built by concatenating user data prior to submitting it to the method.The system is designed so that you can typically build your apps with the default system and file permissions and avoid difficult decisions about security.The following core security features help you build secure apps: It is important that you be familiar with the Android security best practices in this document.The text of the Error Message(s) as display below is shown when clicking on the word Failed to the right of the failed validation rule.Android has built-in security features that significantly reduce the frequency and impact of application security issues.