I’m manually drawing the graph (see below), and the lines drawn at an angle look jagged and unsmooth. Is there any way to make them look nicer?

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Posting my above comment as an answer:
This is only a hunch, but the effect you’re seeing may have something to do with the way Android renders lines that are very thin. When a 1-pixel-wide line is diagonal, a screen pixel only contains “part” of the line and so it might be rendered dimmer. The effect will probably go away if you make the line thicker, since line will “overlap” more of the screen pixels that are on the diagonal.