Kotlin定时器CountDownTimer

1.效果图

2.主页

package com.example.myapplication24import 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.TimeUnitclass MainActivity : AppCompatActivity() {//参考网址：https://github.com/KrithikAjay/CountDownTimerprivate var timeCountInMilliSeconds = 60000Lprivate enum class TimerStatus {STARTED, STOPPED}private var timerStatus = TimerStatus.STOPPEDprivate lateinit var countDownTimer: CountDownTimeroverride 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 = trueimageViewStartStop.setImageResource(R.drawable.icon_stop)editTextMinute.isEnabled = falsetimerStatus = TimerStatus.STARTEDstartCountDownTimer()} else {imageViewReset.isVisible = falseimageViewStartStop.setImageResource(R.drawable.icon_start)editTextMinute.setEnabled(true)timerStatus = TimerStatus.STOPPEDstopCountDownTimer()}}private fun setTimerValues() {var time = 0if (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 = falseimageViewStartStop.setImageResource(R.drawable.icon_start);editTextMinute.isEnabled = truetimerStatus = 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}
}

3.布局

<?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.MySeekBarandroid:id="@+id/seek_main"android:layout_width="match_parent"android:layout_height="80dp" /><ProgressBarandroid: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" /><EditTextandroid: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" /><TextViewandroid: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" /><ImageViewandroid: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" /><ImageViewandroid: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.myapplication24import 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.AppCompatSeekBarclass 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 = truemPaint!!.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)*/}@Synchronizedprotected 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 / 2.0fif (progressRatio > 0.8f) {thumbX -= this.thumb.intrinsicHeight / 2.0f}val thumbY: Float = height / 2f - mProgressTextRect.height() / 2fcanvas.drawText(progressText, thumbX, thumbY, mPaint!!)}}

end

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