Android自定义水平或垂直虚线效果

package com.chen.demo;import android.content.Context;import android.graphics.Canvas;import android.graphics.DashPathEffect;import android.graphics.Paint;import android.graphics.Path;import android.graphics.PathEffect;import android.support.annotation.Nullable;import android.util.AttributeSet;import android.view.View;public class ImaginaryLineView extends View { private Context ct; private Paint mPaint; private Path mPath; private PathEffect effects; private int width; private int height; private int defaultColor=0xffff0000; public ImaginaryLineView(Context context) { this(context, null); } public ImaginaryLineView(Context context, @Nullable AttributeSet attrs) { this(context, attrs, -1); } public ImaginaryLineView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); ct = context; init(); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); width = w; height = h; } private void init() { //初始化，并打开抗锯齿 mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setStyle(Paint.Style.STROKE); mPaint.setColor(defaultColor); mPaint.setStrokeWidth(dip2px(ct, 1)); mPath = new Path(); //数组含义：里面最少要有2个值，值的个数必须是偶数个。偶数位（包含0），表示实线长度，奇数位表示断开的长度 effects = new DashPathEffect(new float[]{4, 2}, 0); }  public void setLineAttribute(int color, float lineWidth,float[] f) { if (color == 0) {  color = defaultColor; } if (lineWidth == 0) {  lineWidth = 1; } if(f==null){  f=new float[]{4,2}; } effects = new DashPathEffect(f, 0); mPaint.setStrokeWidth(dip2px(ct, lineWidth)); mPaint.setColor(color); invalidate(); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //定义起点 mPath.moveTo(0, 0); //定义终点 if(width>height){  //宽度比高度大，是横线  mPath.lineTo(width, 0); }else{  //竖线。（根据实际情况，这里不考虑宽高相等情况）  mPath.lineTo(0, height); } mPaint.setPathEffect(effects); canvas.drawPath(mPath, mPaint); } private static int dip2px(Context context, float dpValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); }}