首先看一个自定义view实现的实线效果图，

实现很简单，就是用paint与path结合使用就可以做到了，由于代码过于简单，直接贴源码

布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.hrules.charter.demo.Main2Activity">
    <com.hrules.charter.demo.widget.PathDemo
        android:layout_width="match_parent"
        android:layout_height="300dp" />

</LinearLayout>

/**
 * 根据path画不连贯线(虚线 破折号线)
 * Created by 黄海 on 2017/4/17.
 */
public class PathDemo extends View {
    Paint paint;
    Path path;
    int width, height;

    public PathDemo(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public PathDemo(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setStyle(Paint.Style.STROKE);//画线条，线条有宽度
        paint.setColor(getResources().getColor(R.color.lightBlue500));
        paint.setStrokeWidth(4);//线条宽度
//        paint.setPathEffect(new DashPathEffect(new float[]{20f, 5f, 10f}, 0));//线的显示效果：破折号格式
        path = new Path();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        width = getMeasuredWidth();
        height = getMeasuredHeight();
        //画实现加号
        path.moveTo(width / 6, height / 2);
        path.lineTo(width / 6 * 5, height / 2);
        path.moveTo(width / 2, height / 6);
        path.lineTo(width / 2, height / 6 * 5);
        canvas.drawPath(path, paint);

    }
}

paint.setPathEffect(new DashPathEffect(new float[]{20f,10f}, 0));

paint.setPathEffect(new DashPathEffect(new float[]{20f,10f,5f}, 0));//线的显示效果：破折号格式

paint.setPathEffect(new DashPathEffect(new float[]{20f,15f,10f,5f}, 0));//线的显示效果：破折号格式

ok，看到这里也许大家都明白了：DashPathEffect的效果就是虚实交替，首先是实，其次是虚，再是实...DashPathEffect的第一个参数是数组，且它的长度必须>=2, 数组的数字就是控制虚实虚实虚实... 长度。

下面看看改变DashPathEffect的第二个参数（上下两行分别对应左右效果图）

paint.setPathEffect(new DashPathEffect(new float[]{20f,10f}, 0));//线的显示效果：破折号格式

paint.setPathEffect(new DashPathEffect(new float[]{20f,10f}, 15));//线的显示效果：破折号格式

可以看出DashPathEffect的第二个参数就是控制第一条线（实线）的偏移量，是向左偏移。下面给出DashPathEffect的源码说明

public class DashPathEffect extends PathEffect {

    /**
     * The intervals array must contain an even number of entries (>=2), with
     * the even indices specifying the "on" intervals, and the odd indices
     * specifying the "off" intervals. phase is an offset into the intervals
     * array (mod the sum of all of the intervals). The intervals array
     * controls the length of the dashes. The paint's strokeWidth controls the
     * thickness of the dashes.
     * Note: this patheffect only affects drawing with the paint's style is set
     * to STROKE or FILL_AND_STROKE. It is ignored if the drawing is done with
     * style == FILL.
     * @param intervals array of ON and OFF distances
     * @param phase offset into the intervals array
     */
    public DashPathEffect(float intervals[], float phase) {
        if (intervals.length < 2) {
            throw new ArrayIndexOutOfBoundsException();
        }
        native_instance = nativeCreate(intervals, phase);
    }
    
    private static native long nativeCreate(float intervals[], float phase);
}