自定义TextView高度错误

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if(paint==null){
Log.d(TAG, "onMeasure: paint 初始化错误");
return;
}

    int heightMode =  MeasureSpec.getMode(heightMeasureSpec);
    int widthMode =  MeasureSpec.getMode(widthMeasureSpec);

    int height = MeasureSpec.getSize(widthMeasureSpec);
    int width = MeasureSpec.getSize(widthMeasureSpec);

    if(widthMode == MeasureSpec.AT_MOST){
        Rect bounds = new Rect();
        paint.getTextBounds(my_text,0,my_text.length(),bounds);
        width = bounds.width() + getPaddingLeft() +getPaddingRight();
    }

    if(heightMode == MeasureSpec.AT_MOST){
        Rect bounds = new Rect();
        paint.getTextBounds(my_text,0,my_text.length(),bounds);
        height = bounds.height() + getPaddingTop() +getPaddingBottom();
    }
    setMeasuredDimension(width,height);
}

    文本显示时，显示的内容只有基线以上的信息，基线以下不显示，比如y显示为v。但是看网友的代码高度都是bound.height()，直接加数值可以显示全部，但就不是自适应了，所以不知道怎么改

继承自TextView，高度别自己计算，继承View岂不是还得自己计算换行？