Android 获取文字宽高

@bingoogolapple 2016-10-07 15:06:07发表于 bingoogolapple/bingoogolapple.github.io Android

获取文字宽度

int textWidth = mPaint.measureText(text)

获取文字高度

int textHeight = mPaint.descent() - mPaint.ascent()

获取文字宽高

Rect textRect = new Rect();
mPaint.getTextBounds(text, 0, text.length(), textRect);
int textWidth = textRect.width();
int textHeight = textRect.height();
private void test(Canvas canvas) {
    mPaint.setTextSize(BGAProgressBar.sp2px(getContext(), 24));
    mPaint.setStyle(Paint.Style.FILL);
    mPaint.setStrokeWidth(BGAProgressBar.dp2px(getContext(), 1));

    String text = "Android王浩Javajg";

    float baseX = 30;
    float baseY = getMeasuredHeight() / 2;
    //获取FontMetrics对象,可以获得top,bottom,ascent,descent
    Paint.FontMetrics metrics = mPaint.getFontMetrics();
    float top = baseY + metrics.top;
    float ascent = baseY + metrics.ascent;
    float descent = baseY + metrics.descent;
    float bottom = baseY + metrics.bottom;

    //绘制top
    mPaint.setColor(Color.CYAN);
    canvas.drawLine(0, top, getWidth(), top, mPaint);
    //绘制ascent
    mPaint.setColor(Color.GREEN);
    canvas.drawLine(0, ascent, getWidth(), ascent, mPaint);
    //绘制base
    mPaint.setColor(Color.MAGENTA);
    canvas.drawLine(0, baseY, getWidth(), baseY, mPaint);
    //绘制descent
    mPaint.setColor(Color.RED);
    canvas.drawLine(0, descent, getWidth(), descent, mPaint);
    //绘制bottom
    mPaint.setColor(Color.BLUE);
    canvas.drawLine(0, bottom, getWidth(), bottom, mPaint);
    //绘制文字
    mPaint.setColor(Color.BLACK);
    canvas.drawText(text, baseX, baseY, mPaint);
}

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