import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.os.CountDownTimer import android.widget.* import androidx.core.view.isVisible import kotlinx.android.synthetic.main.activity_main.* import java.util.concurrent.TimeUnit class MainActivity : AppCompatActivity() { //参考网址：https://github.com/KrithikAjay/CountDownTimer private var timeCountInMilliSeconds = 60000L private enum class TimerStatus { STARTED, STOPPED private var timerStatus = TimerStatus.STOPPED private lateinit var countDownTimer: CountDownTimer override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) imageViewReset.setOnClickListener { reset() imageViewStartStop.setOnClickListener { startStop() private fun reset() { stopCountDownTimer() startCountDownTimer() private fun startStop() { if (timerStatus == TimerStatus.STOPPED) { setTimerValues() setProgressBarValues() imageViewReset.isVisible = true imageViewStartStop.setImageResource(R.drawable.icon_stop) editTextMinute.isEnabled = false timerStatus = TimerStatus.STARTED startCountDownTimer() } else { imageViewReset.isVisible = false imageViewStartStop.setImageResource(R.drawable.icon_start) editTextMinute.setEnabled(true) timerStatus = TimerStatus.STOPPED stopCountDownTimer() private fun setTimerValues() { var time = 0 if (editTextMinute.text != null) { time = (editTextMinute.text.toString().trim()).toInt() } else { Toast.makeText(this, R.string.message_minutes, Toast.LENGTH_SHORT).show(); timeCountInMilliSeconds = (time * 60 * 1000).toLong() private fun startCountDownTimer() { countDownTimer = object : CountDownTimer(timeCountInMilliSeconds, 1000) { override fun onTick(millisUntilFinished: Long) { textViewTime.text = hmsTimeFormatter(millisUntilFinished).toString() progressBar.progress = (millisUntilFinished / 1000).toInt() seek_main.progress = (millisUntilFinished / 1000).toInt() override fun onFinish() { textViewTime.text = hmsTimeFormatter(timeCountInMilliSeconds).toString(); setProgressBarValues(); imageViewReset.isVisible = false imageViewStartStop.setImageResource(R.drawable.icon_start); editTextMinute.isEnabled = true timerStatus = TimerStatus.STOPPED; countDownTimer.start() private fun setProgressBarValues() { progressBar.max = (timeCountInMilliSeconds / 1000).toInt() progressBar.progress = (timeCountInMilliSeconds / 1000).toInt() seek_main.max = (timeCountInMilliSeconds / 1000).toInt() seek_main.progress = (timeCountInMilliSeconds / 1000).toInt() private fun stopCountDownTimer() { countDownTimer.cancel() private fun hmsTimeFormatter(milliSeconds: Long): Any { val hms = String.format( "%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(milliSeconds), TimeUnit.MILLISECONDS.toMinutes(milliSeconds) - TimeUnit.HOURS.toMinutes( TimeUnit.MILLISECONDS.toHours( milliSeconds TimeUnit.MILLISECONDS.toSeconds(milliSeconds) - TimeUnit.MINUTES.toSeconds( TimeUnit.MILLISECONDS.toMinutes( milliSeconds return hms

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorBackground">
    <com.example.myapplication24.MySeekBar
        android:id="@+id/seek_main"
        android:layout_width="match_parent"
        android:layout_height="80dp" />
    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="270dp"
        android:layout_height="270dp"
        android:layout_centerInParent="true"
        android:background="@drawable/drawable_circle_dark_blue"
        android:indeterminate="false"
        android:max="100"
        android:progress="100"
        android:progressDrawable="@drawable/drawable_circle_yellow"
        android:rotation="-90" />
    <EditText
        android:id="@+id/editTextMinute"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/textViewTime"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="10dp"
        android:gravity="center"
        android:hint="@string/hint_minute"
        android:inputType="number"
        android:maxLength="15"
        android:maxLines="1"
        android:minEms="5"
        android:text="1"
        android:textColor="@color/colorYellow"
        android:textColorHint="@color/colorYellow" />
    <TextView
        android:id="@+id/textViewTime"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="00:01:00"
        android:textColor="@color/colorYellow"
        android:textSize="40sp" />
    <ImageView
        android:id="@+id/imageViewReset"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_below="@+id/textViewTime"
        android:layout_centerInParent="true"
        android:layout_marginTop="30dp"
        android:src="@drawable/icon_reset"
        android:visibility="gone" />
    <ImageView
        android:id="@+id/imageViewStartStop"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_below="@+id/progressBar"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:src="@drawable/icon_start" />
</RelativeLayout>

4.自定义seebar

package com.example.myapplication24
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 androidx.appcompat.widget.AppCompatSeekBar
class MySeekBar : AppCompatSeekBar {
    // 画笔
    private var mPaint: Paint? = null
    // 进度文字位置信息
    private val mProgressTextRect: Rect = Rect()
    constructor(context: Context?) : super(context!!)
    constructor(context: Context?, attrs: AttributeSet?) : super(context!!, attrs)
    constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) : super(
        context!!,
        attrs,
        defStyleAttr
    init {
        mPaint = TextPaint()
        mPaint!!.isAntiAlias = true
        mPaint!!.color = Color.parseColor("#00574B")
        mPaint!!.textSize = this.thumb.intrinsicHeight.toFloat()
        // 如果不设置padding，当滑动到最左边或最右边时，滑块会显示不全
        /*  setPadding(this.thumb.intrinsicWidth / 2, 0, this.thumb.intrinsicWidth / 2, 0)*/
    @Synchronized
    protected override fun onDraw(canvas: Canvas) {
        super.onDraw(canvas)
        val progressText: String = progress.toString()
        mPaint!!.getTextBounds(progressText, 0, progressText.length, mProgressTextRect)
        // 进度百分比
        val progressRatio: Float = progress.toFloat() / max.toFloat()
        var thumbX =
            (width - paddingEnd - paddingStart) * progressRatio + paddingStart - this.thumb.intrinsicWidth / 2.0f
        if (progressRatio > 0.8f) {
            thumbX -= this.thumb.intrinsicHeight / 2.0f
        val thumbY: Float = height / 2f - mProgressTextRect.height() / 2f
        canvas.drawText(progressText, thumbX, thumbY, mPaint!!)