Android simple custom dotted view

Code directly

package com.view;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;

/**
 * Created by Administrator on 2018/3/9 0009.
 */

public class DottedLineView extends View {
    private int pointLength = 25 ; // The length and width of each dot in the dotted line is the width declared
 in XML private int space = 10 ; // The distance between the points
 Paint paint ;
 Rect rect ;
     public DottedLineView (Context context) {
         super (context) ;
 init() ;
 }            

            

    public DottedLineView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public DottedLineView (Context context , @Nullable AttributeSet attrs , int defStyleAttr) {
         super (context , attrs , defStyleAttr) ;
         init() ;
     }
     private void init () {
         paint = new Paint(Paint. ANTI_ALIAS_FLAG ) ; // Anti-aliasing
 paint .setColor(Color. parseColor ( "#000000" )) ; // The color of the dotted line (black)
 rect = new Rect()                ;
    }
    
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        int startLeft=0;
        int startTop=0;
      for (int i=0;;i++){
          if(i!=0){
              startTop=startTop+pointLength+space;
          }
          rect.left=startLeft;
          rect.right=startLeft+getWidth();
          rect.top=startTop;
          rect.bottom=startTop+pointLength;
          canvas.drawRect(rect,paint);
          if(rect.bottom>=getHeight()){
  
  //超过View的高度退出循环
              return;
          }


      }
    }
}

Used in xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <com.view.DottedLineView
        android:layout_width="3dp"
        android:layout_height="400dp"
        android:layout_margin="10dp"
        android:background="#fff" />


</LinearLayout>

效果图

其中一些数值我写死在类里面了没有做动态设置

Android simple custom dotted view

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