, baseY, mPaint);
mPaint.setTextSize(20);
canvas.drawText("base", baseX + textWidth, baseY, mPaint);..., topY, mPaint);
canvas.drawText("top", baseX + textWidth, topY, mPaint);
// AscentLine描画
mPaint.setColor...(Color.GREEN);
canvas.drawLine(baseX, ascentY, baseX + textWidth, ascentY, mPaint);
canvas.drawText("...(baseX, descentY, baseX + textWidth, descentY, mPaint);
canvas.drawText("descent", baseX + textWidth,..., bottomY, mPaint);
canvas.drawText("buttom", baseX + textWidth, bottomY + 10, mPaint);
相信通过以上程序,能够很好的理解