源码

自定义属性

<?xml version="1.0" encoding="utf-8"?>
<resources><declare-styleable name="ArcProgressView"><attr name="android:textSize" /><attr name="bgBorderWidth" format="dimension" /><attr name="defaultContentColor" format="color" /><attr name="bgBorderColor" format="color" /><attr name="progressColor" format="color" /><attr name="android:textColor" /></declare-styleable>
</resources>

View（kotlin）源码

package com.example.testimport android.content.Context
import android.content.res.Resources
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Paint
import android.graphics.Rect
import android.util.AttributeSet
import android.util.TypedValue
import android.view.View
import kotlin.math.roundToIntclass ArcProgressView : View {constructor(context: Context?) : super(context)constructor(context: Context?, attrs: AttributeSet?) : this(context, attrs, 0)constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) : super(context,attrs,defStyleAttr) {val obtainStyledAttributes =context?.obtainStyledAttributes(attrs, R.styleable.ArcProgressView)obtainStyledAttributes?.let {textSize = it.getDimensionPixelSize(R.styleable.ArcProgressView_android_textSize,textSize)strokeWidth = it.getDimensionPixelSize(R.styleable.ArcProgressView_bgBorderWidth,strokeWidth.roundToInt()).toFloat()defaultContentColor = it.getColor(R.styleable.ArcProgressView_defaultContentColor,defaultContentColor)bgBorderColor =it.getColor(R.styleable.ArcProgressView_bgBorderColor, bgBorderColor)progressColor =it.getColor(R.styleable.ArcProgressView_progressColor, progressColor)textColor =it.getColor(R.styleable.ArcProgressView_android_textColor, textColor)}obtainStyledAttributes?.recycle()}val paint = Paint(Paint.ANTI_ALIAS_FLAG)var strokeWidth = dpToPx(0.5f).toFloat();var textSize = spToPx(10f).roundToInt()var defaultContentColor = Color.parseColor("#FFF7ED")var bgBorderColor = Color.parseColor("#FAD29D")var progressColor = Color.parseColor("#FAD29D")var textColor = Color.parseColor("#FA940F")private var progress: Int = 0set(value) {field = valueinvalidate()}override fun onDraw(canvas: Canvas) {super.onDraw(canvas)drawBackground(canvas)drawProgress(canvas)}private fun dpToPx(dp: Float): Int {return (Resources.getSystem().displayMetrics.density * dp + 0.5f).roundToInt()}private fun spToPx(sp: Float): Float {return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,sp,Resources.getSystem().displayMetrics)}private fun drawBackground(canvas: Canvas) {paint.strokeWidth = strokeWidthpaint.style = Paint.Style.FILLpaint.color = defaultContentColorcanvas.drawOval(0f + strokeWidth / 2,0f + strokeWidth / 2,width.toFloat() - strokeWidth / 2,height.toFloat() - strokeWidth / 2,paint)paint.style = Paint.Style.STROKEpaint.color = bgBorderColorcanvas.drawOval(0f + strokeWidth / 2,0f + strokeWidth / 2,width.toFloat() - strokeWidth / 2,height.toFloat() - strokeWidth / 2,paint)}val textBound = Rect()private fun drawProgress(canvas: Canvas) {paint.style = Paint.Style.FILLpaint.color = progressColorpaint.textSize = textSize.toFloat()val progressStr = "$progress%"paint.getTextBounds(progressStr, 0, progressStr.length, textBound)val halfTextWidth = textBound.width() / 2fval halfTextHeight = textBound.height() / 2fval progressAngle = progress * 3.6fval halfWidth = width.toFloat() / 2fval halfHeight = height.toFloat() / 2fcanvas.drawArc(0f,0f,width.toFloat(),height.toFloat(),270f,progressAngle,true,paint)paint.isFakeBoldText = truepaint.color = textColorpaint.textAlign = Paint.Align.LEFTcanvas.drawText(progressStr,halfWidth - halfTextWidth,halfHeight - halfTextHeight + textBound.height(),paint)}fun updateProgress(progress: Int) {this.progress = progress}}

Activity布局

  <com.example.test.ArcProgressViewandroid:layout_margin="12dp"android:id="@+id/progress"android:textSize="24sp"android:textColor="@color/black"android:layout_width="100dp"android:layout_height="100dp"/>

Activity更新进度

progress ++
runOnUiThread({progressView.updateProgress(progress)
})

效果图