查询了google发现在android一下有几种方法可以做到，但是经过实际测试发现下面这种方法是最准确的
Rect bounds = new Rect();String text = "Hello World";TextPaint paint;paint = findViewById(R.id.hello_world).getPaint();paint.getTextBounds(text, 0, text.length(), bounds);int width = bounds.width();
Paint pFont = new Paint();Rect rect = new Rect();pFont.getTextBounds("豆", 0, 1, rect);Log.v(TAG, "height:"+rect.height()+"width:"+rect.width());