Android :: Gravity Vs Layout_gravity?

What is the difference between those attributes? According to the documentation of R.attr, there isn't any difference (doc text is exactly the same, see http://developer.android.com/reference/android/R.attr.html), but apparently, that's simply not true. For example, the gravity attribute can be used on EditText to set the text alignment (e.g. left, center, right).

I often found that neither of them work to align a view at all. For example, I need to float two text views in a relative layout, one going to the left below a title bar, the other going to the right below the title bar. So what I did was this:

CODE:...............

That doesn't work, however. The left text is indeed aligned to the left inside its parent (the relative layout), but the right text is not aligned to the right; instead, it's placed directly to the right of the left text.