画布上的 Android 中心文本 [英] Android Center text on canvas
本文介绍了画布上的 Android 中心文本的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试使用下面的代码显示文本.问题是文本没有水平居中.当我为 drawText
设置坐标时,它会在此位置设置文本的底部.我想绘制文本,以便文本也水平居中.
I'm trying to display a text using the code below.
The problem is that the text is not centered horizontally.
When I set the coordinates for drawText
, it sets the bottom of the text at this position. I would like the text to be drawn so that the text is centered also horizontally.
这是进一步显示我的问题的图片:
This is a picture to display my problem further:
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
//canvas.drawRGB(2, 2, 200);
Paint textPaint = new Paint();
textPaint.setARGB(200, 254, 0, 0);
textPaint.setTextAlign(Align.CENTER);
textPaint.setTypeface(font);
textPaint.setTextSize(300);
canvas.drawText("Hello", canvas.getWidth()/2, canvas.getHeight()/2 , textPaint);
}
推荐答案
尝试以下操作:
Paint textPaint = new Paint();
textPaint.setTextAlign(Paint.Align.CENTER);
int xPos = (canvas.getWidth() / 2);
int yPos = (int) ((canvas.getHeight() / 2) - ((textPaint.descent() + textPaint.ascent()) / 2)) ;
//((textPaint.descent() + textPaint.ascent()) / 2) is the distance from the baseline to the center.
canvas.drawText("Hello", xPos, yPos, textPaint);
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