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参考 https://blog.csdn.net/l_o_s/article/details/73550876

<com.xxx.wwww.weight.PointDividerViewandroid:layout_width="match_parent"android:layout_height="wrap_content"app:PDbackgroundColor="@color/white"app:dotColor="@color/com_red"app:dotRadius="2dp"app:dividerWidth="5dp"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent" />

 attrs.xml

<declare-styleable name="PointDividerView"><!--自定义圆点的半径大小--><attr name="dotRadius" format="dimension" /><!--圆点的间距--><attr name="dividerWidth" format="dimension" /><!--圆点颜色--><attr name="dotColor" format="color" /><!--虚线背景颜色--><attr name="PDbackgroundColor" format="color" /></declare-styleable>

 

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;import androidx.annotation.Nullable;import com.feishi.pettyloan.R;/*** https://blog.csdn.net/l_o_s/article/details/73550876* Created by Lyf on 2017/6/5.* 撸一串圆点做分割线 圆点分割线*/
public class PointDividerView extends View {private Paint mPaint; // 画笔private float radius; // 圆的半径private float dividerWidth; // 圆的间距private int mColor; // 圆点的颜色private int mBackgroundColor; // 背景颜色private Context mContext;public PointDividerView(Context context) {super(context);init(context, null);}public PointDividerView(Context context, @Nullable AttributeSet attrs) {super(context, attrs);init(context, attrs);}public PointDividerView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init(context, attrs);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);setMeasuredDimension(widthMeasureSpec, dip2px(10));}protected void init(Context context, @Nullable AttributeSet attrs) {mContext = context;mPaint = new Paint();if (attrs != null) {TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PointDividerView);radius = a.getDimension(R.styleable.PointDividerView_dotRadius, dip2px(1));dividerWidth = a.getDimension(R.styleable.PointDividerView_dividerWidth, dip2px(6));mColor = a.getColor(R.styleable.PointDividerView_dotColor, Color.parseColor("#d1d1d1"));mBackgroundColor = a.getColor(R.styleable.PointDividerView_PDbackgroundColor, Color.TRANSPARENT);a.recycle();} else {radius = dip2px(1);dividerWidth = dip2px(6);mColor = Color.parseColor("#d1d1d1");mBackgroundColor = Color.TRANSPARENT;}}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);// 绘制背景canvas.drawColor(mBackgroundColor);mPaint.setAntiAlias(true);mPaint.setColor(mColor); // 设置颜色int measuredHeight = getMeasuredHeight() / 2; // 高度居中int measuredWidth = getMeasuredWidth();for (float i = radius; i < measuredWidth; ) {canvas.drawCircle(i, measuredHeight, radius, mPaint); // 小圆i += dividerWidth;}}private int dip2px(float dip) { // Metrics（满锤思）测量density（扽思提）密度float density = getContext().getResources().getDisplayMetrics().density;return (int) (dip * density + 0.5f);}
}