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.
On the bottom menu bar, select Files. Locate your PDF file on your Android and select it. Read your document. You can also adjust viewing and scrolling settings to your preferences.
Go to Settings. Go to Apps. Select the other PDF app, that always open up automatically. Scroll down to "Launch By Default" or "Open by default".
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.
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
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