Android新建水平节点进度条示例

itemWidth / 2 - textWidth / 2

package cn.wwj.customview.widget
import Android.content.Context
import android.graphics.canvas
import android.graphics.Color
import android.graphics.Paint
import android.graphics.Rect
import android.text.TextPaint
import android.util.AttributeSet
import android.util.Log
import androidx.annotation.Nullable
import androidx.appcompat.widget.AppCompatTextView
import androidx.core.content.ContextCompat
import androidx.core.view.marginTop
import cn.wwj.customview.R
import cn.wwj.customview.dp2px
import cn.wwj.customview.sp2px

class nodePointProcessBar : AppCompatTextView {
    
    private lateinit var mTextPaint: TextPaint
    
    private lateinit var mCirclePaint: Paint
    private var isDebug = false
    
    private var mCompleteTextColor: Int = ContextCompat.getColor(context, android.R.color.black)
    
    private var mProcessTextColor: Int = ContextCompat.getColor(context, R.color.purple)
    
    private var mWaitProcessTextColor: Int = ContextCompat.getColor(context, R.color.gray_text)
    
    private var mCircleCount = 0
    private var TAG = "NodePointProcessBar"
    
    private var mCircleRadius = 5f.dp2px()
    
    private var mCircleBorder = 1f.dp2px()
    
    private var mLineWidth = 1f.dp2px()
    
    private var mLineMargin = 4f.dp2px()
    
    var mTextCircleMargin = 7f.dp2px()
    
    private var mTextLeftRightMargin = 8f.dp2px()
    
    private var mContentHeight = 0f
    private var mContentWidth = 0f
    
    private var mTextList: List<String> = mutableListOf()
    
    private var mProcessIndexSet: Set<Int> = mutableSetOf()
    
    private var mTextBoundList: MutableList<Rect> = mutableListOf()
    
    private val mRect = Rect()
    constructor(context: Context) : this(context, null)
    constructor(context: Context, @Nullable attrs: AttributeSet?) : this(context, attrs, 0)
    constructor(
        context: Context,
        @Nullable attrs: AttributeSet?,
        defStyleAttr: Int
    ) : super(context, attrs, defStyleAttr) {
        val appearance = context.obtainStyledAttributes(attrs, R.styleable.NodePointProcessBar)
        mCompleteTextColor = appearance.getColor(
            R.styleable.NodePointProcessBar_completedTextColor, mCompleteTextColor
        )
        mWaitProcessTextColor = appearance.getColor(
            R.styleable.NodePointProcessBar_processTextColor, mWaitProcessTextColor
        )
        mProcessTextColor =
            appearance.getColor(
                R.styleable.NodePointProcessBar_waitProcessTextColor,
                mProcessTextColor
            )
        isDebug = appearance.getBoolean(
            R.styleable.NodePointProcessBar_isDebug, isDebug
        )
        mTextCircleMargin = appearance.getDimension(
            R.styleable.NodePointProcessBar_textCircleMargin, mTextCircleMargin
        )
        mTextLeftRightMargin = appearance.getDimension(
            R.styleable.NodePointProcessBar_textLeftRightMargin, mTextLeftRightMargin
        )
        mCircleRadius = appearance.getDimension(
            R.styleable.NodePointProcessBar_npbCircleRadius, mCircleRadius
        )
        mCircleBorder = appearance.getDimension(
            R.styleable.NodePointProcessBar_circleBorder, mCircleBorder
        )
        mLineWidth = appearance.getDimension(
            R.styleable.NodePointProcessBar_lineWidth, mLineWidth
        )
        mLineMargin = appearance.getDimension(
            R.styleable.NodePointProcessBar_lineMargin, mLineMargin
        )
        initPaint()
        show(mTextList, mProcessIndexSet)
    }
    
    private fun initPaint() {
        // 设置文字画笔
        mTextPaint = TextPaint()
        mTextPaint.isAntiAlias = true
        mTextPaint.textSize = textSize
        mTextPaint.color = mWaitProcessTextColor
        // 设置圆圈画笔
        mCirclePaint = Paint()
        mCirclePaint.isAntiAlias = true
        mCirclePaint.color = mProcessTextColor
        mCirclePaint.style = Paint.Style.STROKE
        mCirclePaint.strokeWidth = mCircleBorder
    }
    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec)
        val widthMode = MeasureSpec.getMode(widthMeasureSpec)
        val heightMode = MeasureSpec.getMode(heightMeasureSpec)
        Log.d(TAG, "---------------onMeasure()")
        measureText()
        val widthSize = if (MeasureSpec.EXACTLY == widthMode) {
            MeasureSpec.getSize(widthMeasureSpec)
        } else {
            mContentWidth.toInt()
        }
        val heightSize = if (MeasureSpec.EXACTLY == heightMode) {
            MeasureSpec.getSize(heightMeasureSpec)
        } else {
            mContentHeight.toInt()
        }
        
        setMeasuredDimension(widthSize, heightSize)
        calcContentWidthHeight()
    }
    
    private fun measureText() {
        Log.d(TAG, "---------------measureText()")
        mTextBoundList.clear()
        for (name in mTextList) {
            mRect.setEmpty()
            mTextPaint.getTextBounds(name, 0, name.length, mRect)
            mTextBoundList.add(mRect)
        }
    }
    
    private fun calcContentWidthHeight() {
        // 一开始没有传递文字的
        mContentHeight = if (mTextBoundList.isNotEmpty()) {
            mCircleRadius * 2 + mTextCircleMargin + mRect.height() + getBaseline(mTextPaint)
        } else {
            mTextPaint.getTextBounds("中", 0, 1, mRect)
            mCircleRadius * 2 + mTextCircleMargin + mRect.height() + getBaseline(mTextPaint)
        }
        if (measuredWidth == 0 || mTextBoundList.isEmpty()) {
            return
        }
        mContentWidth = 0f
        for (rect in mTextBoundList) {
            mContentWidth += rect.width()
        }
        Log.d(TAG, "---------------measuredWidth=$measuredWidth,mContentWidth=$mContentWidth")
        // 如果控件的宽度小于内容的宽度加文本的边距,意味着一行放不下了,文字的大小减小1sp,重新测量文字的宽高后,设置控件得高度
        // 如果控件的宽度大于内容的宽度加文本的边距,意味着一行放得下,设置控件得高度
        if (measuredWidth - mContentWidth < (mTextLeftRightMargin * (mTextList.size - 1))) {
            mTextPaint.textSize = mTextPaint.textSize - 1f.sp2px()
            measureText()
            calcContentWidthHeight()
            return
        }
        setMeasuredDimension(measuredWidth, mContentHeight.toInt())
    }
    override fun onDraw(canvas: Canvas) {
        //若未设置节点标题或者选中项的列表，则取消绘制
        if (mTextList.isEmpty() || mTextBoundList.isEmpty()) {
            return
        }
        //画灰色圆圈的个数
        mCircleCount = mTextList.size
        // 每一段文字的Y坐标
        val textY = getBaseline(mTextPaint) + height / 2 + marginTop / 2
        mCirclePaint.strokeWidth = mCircleBorder
        //绘制文字和圆形
        for (i in 0 until mCircleCount) {
            if (mProcessIndexSet.contains(i)) {
                // 正在处理中
                if (mProcessIndexSet.size == i + 1) {
                    mCirclePaint.style = Paint.Style.FILL
                    // 正在处理中的文字颜色
                    mTextPaint.color = mProcessTextColor
                    mCirclePaint.color = mProcessTextColor
                } else {
                    //处理完成圆圈空心
                    mCirclePaint.style = Paint.Style.STROKE
                    //处理完成文字颜色
                    mTextPaint.color = mCompleteTextColor
                    mCirclePaint.color = mProcessTextColor
                }
            } else {
                //待处理
                mCirclePaint.color = mWaitProcessTextColor
                mCirclePaint.style = Paint.Style.FILL
                mTextPaint.color = mWaitProcessTextColor
            }
            //每一段文字宽度
            val textWidth = mTextBoundList[i].width()
            // 每一段宽度
            val itemWidth = width * 1f / mCircleCount
            // 每一段文字居中
            // |----text----|----text----|
            //    一段文字       一段文字
            //每一段文字起始的X坐标
            val textX = itemWidth / 2f - textWidth / 2f + i * itemWidth
            canvas.drawText(mTextList[i], textX, textY, mTextPaint)
            //每一个圆圈的Y坐标
            val circleY = height / 2f - mCircleRadius - mTextCircleMargin / 2
            //每一个圆圈的X坐标
            val circleX = itemWidth / 2 + i * itemWidth
            canvas.drawCircle(
                circleX,
                circleY,
                mCircleRadius,
                mCirclePaint
            )
            // 画线,两个圆圈之间一条线段
            mCirclePaint.strokeWidth = mLineWidth
            if (i < mCircleCount - 1) {
                //已经处理过的线颜色
                if (mProcessIndexSet.contains(i + 1)) {
                    mCirclePaint.color = mProcessTextColor
                } else {
                    // 待处理的线段颜色
                    mCirclePaint.color = mWaitProcessTextColor
                }
                // 线段起始 x 坐标
                val lineStartX = itemWidth * i + itemWidth / 2f + mCircleRadius + mLineMargin
                // 线段结束 x 坐标
                val lineEndX =
                    itemWidth * i + itemWidth + itemWidth / 2f - mCircleRadius - mLineMargin
                canvas.drawLine(
                    lineStartX,
                    circleY,
                    lineEndX,
                    circleY,
                    mCirclePaint
                )
            }
            Log.d("tag", "--------itemWidth=$itemWidth")
        }
        if (isDebug) {
            mCirclePaint.color = Color.RED
            canvas.drawLine(
                0f,
                height / 2f - 1f.dp2px() / 2,
                width * 1F,
                height / 2f + 1f.dp2px() / 2,
                mCirclePaint
            )
        }
    }
    
    fun setNodeData(titles: List<String>, progressIndexSet: Set<Int>) {
        mTextList = titles
        mProcessIndexSet = progressIndexSet
        measureText()
        calcContentWidthHeight()
        invalidate()
    }
    
    private fun getBaseline(p: Paint): Float {
        val fontMetrics: Paint.FontMetrics = p.fontMetrics
        return (fontMetrics.bottom - fontMetrics.top) - fontMetrics.descent
    }
}

 <declare-styleable name="NodePointProcessBar">
        <attr name="completedTextColor" fORMat="color" />
        <attr name="processTextColor" format="color" />
        <attr name="waitProcessTextColor" format="color" />
        <attr name="textCircleMargin" format="dimension" />
        <attr name="textLeftRightMargin" format="dimension" />
        <attr name="npbCircleRadius" format="dimension" />
        <attr name="circleBorder" format="dimension" />
        <attr name="lineWidth" format="dimension" />
        <attr name="lineMargin" format="dimension" />
        <attr name="isDebug" format="boolean" />
    </declare-styleable>

fun Int.sp2px(): Int {
    val displayMetrics = Resources.getSystem().displayMetrics
    return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, this.toFloat(), displayMetrics)
        .toInt()
}
fun Float.sp2px(): Float {
    val displayMetrics = Resources.getSystem().displayMetrics
    return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, this, displayMetrics)
}
fun Int.dp2px(): Int {
    val displayMetrics = Resources.getSystem().displayMetrics
    return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, this.toFloat(), displayMetrics)
        .toInt()
}
fun Float.dp2px(): Float {
    val displayMetrics = Resources.getSystem().displayMetrics
    return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, this, displayMetrics)
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="Http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <cn.wwj.customview.widget.NodePointProcessBar
        android:id="@+id/nodePointPb"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:layout_marginHorizontal="10dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:isDebug="false"
        app:lineWidth="1dp"
        app:lineMargin="5dp"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

package cn.wwj.customview
import android.os.Bundle
import android.os.Handler
import android.os.Looper
import androidx.appcompat.app.AppCompatActivity
import cn.wwj.customview.widget.NodePointProcessBar

class NodeProgressBarActivity : AppCompatActivity() {
    
    private val mTextList: List<String> = mutableListOf("提交申请", "商家处理", "寄回商品", "商家退款", "退款成功")
    
    private var mProgressIndexSet: Set<Int> = mutableSetOf(0, 1,2,3,4,6)
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_node_progress_bar)
        val nodePointPb: NodePointProcessBar = findViewById(R.id.nodePointPb)
        Handler(Looper.getMainLooper()).postDelayed({
            nodePointPb.setNodeData(mTextList, mProgressIndexSet)
        }, 1000)
    }
}