用android的canvas drawText的时候,即使text包行\r\n,画出来的仍然不会换行。
这时需要用到TextPain
TextPaint textPaint = new TextPaint();
   textPaint.setARGB(0xFF, 0, 0, 0);
   textPaint.setTextSize(20.0F);
   textPaint.setAntiAlias(true);
   StaticLayout layout = new StaticLayout("abc\r\n123", textPaint, 300,
                                Alignment.ALIGN_NORMAL, 1.0F, 0.0F, true);
   cv.save();
   cv.translate(20, 20);//从20,20开始画
   layout.draw(cv);
   cv.restore();//别忘了restore
            
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                                    textPain换行
                                    cancas