Kotlin Android SeekBar KotlinAndroidSeekBar|Kotlin

Android SeekBar是一种带有可拖动拇指的ProgressBar。最终用户可以左右拖动拇指来移动歌曲的进度, 文件下载等。
SeekBar.OnSeekBarChangeListener接口提供了用于对搜索栏进行均匀处理的方法。
【Kotlin Android SeekBar】我们可以在Android中创建两种类型的SeekBar

SeekBar进展顺利。
SeekBar具有离散的进度点。

使用属性style =“ @ style / Widget.AppCompat.SeekBar.Discrete”创建SeekBar的离散进度点, 并使用属性max指定最大值。
Kotlin Android SeekBar示例在此示例中, 我们将创建具有平滑进度的SeekBar和具有离散进度点的SeekBar。
activity_main.xml
在activity_main.xml布局中添加SeekBar。

< ?xml version="1.0" encoding="utf-8"?> < android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="example.srcmini.com.kotlinseekbar.MainActivity"> < SeekBarandroid:id="@+id/seekbar_Default"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginBottom="8dp"android:layout_marginEnd="8dp"android:layout_marginStart="8dp"android:layout_marginTop="8dp"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintHorizontal_bias="0.0"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintVertical_bias="0.174" /> < SeekBarandroid:id="@+id/seekbar_Discrete"style="@style/Widget.AppCompat.SeekBar.Discrete"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginBottom="8dp"android:layout_marginEnd="8dp"android:layout_marginStart="8dp"android:layout_marginTop="8dp"android:max="10"android:progress="0"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintHorizontal_bias="1.0"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintVertical_bias="0.333" /> < /android.support.constraint.ConstraintLayout>

MainActivity.kt
在此类中, 我们调用SeekBar.OnSeekBarChangeListener接口并覆盖其方法。

package example.srcmini.com.kotlinseekbarimport android.support.v7.app.AppCompatActivityimport android.os.Bundleimport android.widget.SeekBarimport android.widget.Toastclass MainActivity : AppCompatActivity() {var seekBarNormal: SeekBar? = nullvar seekBarDiscrete: SeekBar? = nulloverride fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)seekBarNormal= findViewById(R.id.seekbar_Default)seekBarDiscrete = findViewById(R.id.seekbar_Discrete)seekBarNormal?.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) {Toast.makeText(applicationContext, "seekbar progress: $progress", Toast.LENGTH_SHORT).show()}override fun onStartTrackingTouch(seekBar: SeekBar) {Toast.makeText(applicationContext, "seekbar touch started!", Toast.LENGTH_SHORT).show()}override fun onStopTrackingTouch(seekBar: SeekBar) {Toast.makeText(applicationContext, "seekbar touch stopped!", Toast.LENGTH_SHORT).show()}})seekBarDiscrete?.setOnSeekBarChangeListener(object :SeekBar.OnSeekBarChangeListener{override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {// TODO("not implemented") //To change body of created functions use File | Settings | File Templates.Toast.makeText(applicationContext, "discrete seekbar progress: $progress", Toast.LENGTH_SHORT).show()}override fun onStartTrackingTouch(seekBar: SeekBar?) {//TODO("not implemented") //To change body of created functions use File | Settings | File Templates.Toast.makeText(applicationContext, "discrete seekbar touch started!", Toast.LENGTH_SHORT).show()}override fun onStopTrackingTouch(seekBar: SeekBar?) {//TODO("not implemented") //To change body of created functions use File | Settings | File Templates.Toast.makeText(applicationContext, "discrete seekbar touch stopped", Toast.LENGTH_SHORT).show()}})}}

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