使用View绘制虚线时demo，方便复习

public class DashedLineView extends View { 

                                                                                                                     

    public DashedLineView(Context context, AttributeSet attrs) { 

        super(context, attrs);           

                                                                                                                           

    } 

                                                                                                                   

    @Override 

    protected void onDraw(Canvas canvas) { 

        // TODO Auto-generated method stub 

        super.onDraw(canvas);         

        Paint paint =newPaint(); 

        paint.setStyle(Paint.Style.STROKE); 

        paint.setColor(Color.DKGRAY); 

        Path path =newPath();      

        path.moveTo(0, 10); 

        path.lineTo(480,10);       

        PathEffect effects =newDashPathEffect(newfloat[]{5,5,5,5},1); 

        paint.setPathEffect(effects); 

        canvas.drawPath(path, paint); 

    }

}

<com.android.pennote.DashedLineView

android:layout_height="20px"

android：id="@+id/dashed"        

android:layout_width="wrap_content"/>
----------------------------------------------------------------------------------------------------------------


画笔样式分三种：

1.Paint.Style.STROKE：描边

2.Paint.Style.FILL_AND_STROKE：描边并填充

3.Paint.Style.FILL：填充

lineTo(float x, float y)方法：

lineTo(float x, float y)方法用于从当前轮廓点绘制一条线段到x，y点：

从原点开始绘制一条折线，代码如下：

Path path = new Path();path.lineTo(100,100); path.lineTo(100, 200); path.lineTo(150, 250); canvas.drawPath(path, paint);

默认从0,0点开始

moveTo(float x, float y)方法：

path的moveTo方法将起始轮廓点移至x，y坐标点，默认情况为0,0点

使用moveTo设置轮廓点：代码如下：

Path path = new Path();
path.moveTo(20, 200);path.lineTo(50, 200);path.lineTo(100, 300); path.lineTo(200, 350); canvas.drawPath(path, paint);

PathEffect effects = new DashPathEffect(newfloat[]{5,5,5,5},1);

第一个参数是一个浮点型的整数，我们在定义该参数的时候只要浮点型数组中的元素个数大于等于2即可。例如：

float[] {20, 10}的偶数参数20（注意数组下标是从0开始哦）定义了我们第一条实线的长度，而奇数参数10则表示第一条虚线的长度，如果此时数组后面不再有数据则重复第一个数以此往复循环，整条线就成了[20,10,20,10,20,10…………………………]这么一个状态。

而DashPathEffect的第二个参数（phase）我称之为偏移值，动态改变其值会让路径产生动画的效果

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