Adobe Scan is an app to scan any document using the camera on your Android. With it you can convert any printed document into a PDF file and save it to your device's memory or send it via any app.
The scanning tool in Adobe Scan is simple and effective. The only thing you have to do is focus on the document you want, take a second to scan it, and then try to keep the camera as still as possible. Automatically, without needing to tap any buttons, the app will recognize the document and scan it.
Once you're done scanning, all you have to do is finalize your PDF and check that everything is how you want it. You can reorder the pages as needed and make sure you didn't accidentally miss one. You can also color-correct any of the pages or even convert the whole document to black and white.