Android 文字绘制

public void drawTextCenter(Canvas canvas, Rect rect, String text, Paint paint) {
    Paint.FontMetricsInt fontMetrics = paint.getFontMetricsInt();
    float baseline = (rect.bottom + rect.top - fontMetrics.bottom - fontMetrics.top) / 2;
    paint.setTextAlign(Paint.Align.CENTER);
    canvas.drawText(text, rect.centerX(), baseline, paint);
}