在画布上的Android中心文 [英] Android Center text on canvas
本文介绍了在画布上的Android中心文的处理方法,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
我想显示使用下面的code文本。
现在的问题是,该文本不是水平居中。
当我设置为的drawText
的坐标,它设置在此位置文本的底部。我想绘制的文本,该文本也居中水平。
这是一个图片,以进一步显示我的问题:
@覆盖
保护无效的OnDraw(帆布油画){
// TODO自动生成方法存根
super.onDraw(画布);
//canvas.drawRGB(2,2,200);
油漆textPaint =新的油漆();
textPaint.setARGB(200,254,0,0);
textPaint.setTextAlign(Align.CENTER);
textPaint.setTypeface(字体);
textPaint.setTextSize(300);
canvas.drawText(你好,canvas.getWidth()/ 2,canvas.getHeight()/ 2,textPaint);
}
解决方案
请尝试以下操作:
INT XPOS =(canvas.getWidth()/ 2);
INT yPos =(int)的((canvas.getHeight()/ 2) - ((textPaint.descent()+ textPaint.ascent())/ 2));
//((textPaint.descent()+ textPaint.ascent())/ 2)是从基线到中心的距离。
canvas.drawText(你好,XPOS,yPos,textPaint);
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.
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);
}
解决方案
Try the following:
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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