Some Sony A7-series cameras use an Android-based subsystem for Sony’s PlayMemories Camera Apps platform, but they are not general-purpose Android cameras in the usual sense. On supported models, you can install apps from Sony’s proprietary PlayMemories Camera App store, which included apps such as timelapse.

Sony also provided a camera developer portal for in-camera app development. In addition, the community has reverse-engineered parts of the PlayMemories installation process, which has enabled custom app installation on some models.

So, in short: yes, supported A7/A7R bodies can run Sony camera apps, and there has been both official and unofficial interest in custom app development. If your main goal is HDR timelapse, check first whether your specific A7/A7R model supports PlayMemories apps, since support varies by camera generation and firmware ecosystem.