canvas上的Android Center文本

我试图使用下面的代码显示一个文本。问题是文本没有水平居中。当我为drawText设置坐标时，它将文本的底部设置在这个位置。我想要的文本被绘制，使文本也是水平居中。

这是一张进一步展示我的问题的图片:

@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);
}

当前回答

在你的油漆属性中使用这个:

 textPaint.setTextAlign(Paint.Align.CENTER);

2020-10-01 07:21:42

其他回答

试试下面的方法:

 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);

2012-06-20 14:31:44

我发现文本居中的最佳解决方案如下:

textPaint.setTextAlign(Paint.Align.CENTER);
//textPaint is the Paint object being used to draw the text (it must be initialized beforehand)
float textY=center.y;
float textX=center.x; 
// in this case, center.x and center.y represent the coordinates of the center of the rectangle in which the text is being placed
canvas.drawText(text,textX,textY,textPaint);    `

2015-07-02 13:52:33

添加这些到你的onDraw方法:

paint.setColor(getContext().getResources().getColor(R.color.black));
paint.setTextAlign(Paint.Align.CENTER);
canvas.drawText("Text", (float) getHeight() / 2f, (float) getWidth() / 2f, paint);

2020-12-21 22:25:22

适用于我使用: textPaint。textAlign = Paint.Align.CENTER使用textPaint.getTextBounds

private fun drawNumber(i: Int, canvas: Canvas, translate: Float) {
            val text = "$i"
            textPaint.textAlign = Paint.Align.CENTER
            textPaint.getTextBounds(text, 0, text.length, textBound)

            canvas.drawText(
                    "$i",
                    translate + circleRadius,
                    (height / 2 + textBound.height() / 2).toFloat(),
                    textPaint
            )
        }

结果是:

2019-03-19 11:57:38

我创建了一个方法来简化它:

    public static void drawCenterText(String text, RectF rectF, Canvas canvas, Paint paint) {
    Paint.Align align = paint.getTextAlign();
    float x;
    float y;
    //x
    if (align == Paint.Align.LEFT) {
        x = rectF.centerX() - paint.measureText(text) / 2;
    } else if (align == Paint.Align.CENTER) {
        x = rectF.centerX();
    } else {
        x = rectF.centerX() + paint.measureText(text) / 2;
    }
    //y
    metrics = paint.getFontMetrics();
    float acent = Math.abs(metrics.ascent);
    float descent = Math.abs(metrics.descent);
    y = rectF.centerY() + (acent - descent) / 2f;
    canvas.drawText(text, x, y, paint);

    Log.e("ghui", "top:" + metrics.top + ",ascent:" + metrics.ascent
            + ",dscent:" + metrics.descent + ",leading:" + metrics.leading + ",bottom" + metrics.bottom);
}

rectF是你想要绘制文本的区域，就是这样。细节

2015-10-18 13:47:22

canvas上的Android Center文本

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