What is INSTALL_PARSE_FAILED_NO_CERTIFICATES error?
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The `INSTALL_PARSE_FAILED_NO_CERTIFICATES` error is a common issue encountered by Android developers during the application installation process. It is a part of Android's mechanism to ensure the integrity and security of applications being installed on devices. This error specifically indicates that the APK file being installed does not contain the necessary cryptographic certificates.
Understanding APK Certification
What is an APK?
An Android Package (APK) is the file format used by the Android operating system for the distribution and installation of mobile apps. It is analogous to the `.exe` file used to install software on Windows. An APK contains all of a program’s code, resources, assets, and manifest file.
The Role of Certificates
Certificates are digital signatures that ensure the integrity and authenticity of the APK file. When an app is compiled, it must be signed with a digital certificate, which the Android operating system uses to verify who the developer is and that no malicious alterations have been made to the code.
Causes of INSTALL_PARSE_FAILED_NO_CERTIFICATES Error
The `INSTALL_PARSE_FAILED_NO_CERTIFICATES` error arises primarily due to the following reasons:
- Unsigned APK: The APK file is being sideloaded or installed without being signed with a valid certificate.
- Incorrect Signing Process: The APK might not be properly signed, or the signing process was interrupted or corrupted, leaving no valid certificate.
- Corrupted APK File: The APK file might be corrupted, thus removing the certificate's integrity.
- Incompatible or Outdated Signing Schema: New signing mechanisms introduced in different API levels may not align with older signing schematics, especially when compatibility is not maintained.
Technical Example
For example, consider the following scenario: a developer compiles an Android application and generates an APK. The developer attempts to install this APK on a device using `adb install app-release.apk`, only to encounter:
- `jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore my-release-key.keystore app-release-unsigned.apk alias_name`
- Use Android Studio to build your APK with the build variant settings set to the appropriate scheme.
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