[android help] How to construct a button on runtime (Android)

There's nothing on this particular feature of Android in the documentation (for example here:

http://developer.android.com/reference/android/widget/Button.html#Button(android.content.Context)

How do i add a button to exsiting layout (or create a layout on runtime as well)?

And then, how do i apply attributes to said button i've just created?

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