问题
I heard something recently about it being included in Froyo and I was wondering if there was any truth to it. If there is, it would help me with an app idea greatly.
回答1:
You are probably referring to the Adobe Reader, which is freely available for Android 2.1+. Some devices also have other applications pre-installed for rendering pdf files. See this question on how you can open the default pdf viewer from your application.
回答2:
Android has a built in framework from Android 5.0 / Lollipop, it's called PDFRenderer.
There's an official example on Google's developer site:
http://developer.android.com/samples/PdfRendererBasic/index.html
来源：https://stackoverflow.com/questions/3969041/does-android-have-a-built-in-pdf-viewer