Paint

　　要绘图，首先得调整画笔，待画笔调整好之后，再将图像绘制到画布Canvas上，

这样才可以显示在手机屏幕上。Android 中的画笔是 Paint类，Paint 中包含了很多方法对其属性进行设置，

Paint方法一般可分两类，图形的绘制和文本的绘制

主要方法如下：（没有全部列出，大家可以查看官方文档 ）

1 canvas.drawColor(Color.GREEN); 2 3 Paint paint1 = new Paint(); 4 canvas.drawCircle(40, 30, 20, paint1); paint1.setAntiAlias(true); 8 canvas.drawCircle(100, 30, 20, paint1); canvas.drawText("无透明度", 100, 70, new Paint()); 12 Paint paint2 = new Paint(); 13 paint2.setAlpha(0x77); 14 canvas.drawText("半透明度", 20, 70, paint2); canvas.drawText("锚点", 20, 90, new Paint()); 18 Paint paint3 = new Paint(); paint3.setTextAlign(Paint.Align.CENTER); 22 canvas.drawText("锚点", 20, 105, paint3); Paint paint4 = new Paint(); 26 float len =paint4.measureText("文本宽度:"); 27 canvas.drawText("文本长度:"+len, 20, 130, new Paint()); canvas.drawRect(new Rect(20,140,40,160), new Paint()); 31 Paint paint5 = new Paint(); paint5.setStyle(Style.STROKE); 35 canvas.drawRect(new Rect(60,140,80,160), paint5); Paint paint6 = new Paint(); 39 paint6.setColor(Color.GRAY); 40 canvas.drawText("灰色", 30, 180, paint6); canvas.drawLine(20, 200,70, 200, new Paint()); 44 Paint paint7 = new Paint(); 45 paint7.setStrokeWidth(7); 46 canvas.drawLine(20, 220,70, 220,paint7); Paint paint8 = new Paint(); 50 paint8.setTextSize(20); 51 canvas.drawText("文字尺寸", 20, 260, paint8); Paint paint9 = new Paint(); 55 paint9.setARGB(0x77, 0xff, 0x00, 0x00); 56 canvas.drawText("红色半透明", 20, 290, paint9);

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