Kt: การใช้ SeekBar

Posted on 27 September, 2018 by jack

activity_main.xml

<?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=".MainActivity"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical"> <TextView android:id="@+id/progress" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="20dp" android:text="- -" android:textSize="24sp" /> <TextView android:id="@+id/seekbarStatus" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="20dp" android:text="- -" android:textSize="24sp" /> <SeekBar android:id="@+id/seekbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="15dp" /> </LinearLayout> </android.support.constraint.ConstraintLayout>

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<?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=".MainActivity">       <LinearLayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:gravity="center"         android:orientation="vertical">           <TextView             android:id="@+id/progress"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:padding="20dp"             android:text="- -"             android:textSize="24sp" />           <TextView             android:id="@+id/seekbarStatus"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:padding="20dp"             android:text="- -"             android:textSize="24sp" />           <SeekBar             android:id="@+id/seekbar"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:padding="15dp" />       </LinearLayout>   </android.support.constraint.ConstraintLayout>

MainActivity.kt

package com.phaisarn.ktapplication import android.support.v7.app.AppCompatActivity import android.os.Bundle import android.widget.SeekBar import android.widget.TextView import kotlinx.android.synthetic.main.activity_main.* class MainActivity : AppCompatActivity(), SeekBar.OnSeekBarChangeListener { private var progressView: TextView? = null private var seekbarStatusView: TextView? = null private var seekbarView: SeekBar? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) progressView = this.progress seekbarStatusView = this.seekbarStatus seekbarView = this.seekbar seekbarView!!.setOnSeekBarChangeListener(this) } override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) { progressView!!.text = progress.toString() seekbarStatusView!!.text = "Tracking Touch" } override fun onStartTrackingTouch(seekBar: SeekBar) { seekbarStatusView!!.text = "Started Tracking Touch" } override fun onStopTrackingTouch(seekBar: SeekBar) { seekbarStatusView!!.text = "Stopped Tracking Touch" } }

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package com.phaisarn.ktapplication   import android.support.v7.app.AppCompatActivity import android.os.Bundle import android.widget.SeekBar import android.widget.TextView import kotlinx.android.synthetic.main.activity_main.*   class MainActivity : AppCompatActivity(), SeekBar.OnSeekBarChangeListener {       private var progressView: TextView? = null     private var seekbarStatusView: TextView? = null     private var seekbarView: SeekBar? = null       override fun onCreate(savedInstanceState: Bundle?) {         super.onCreate(savedInstanceState)         setContentView(R.layout.activity_main)           progressView = this.progress         seekbarStatusView = this.seekbarStatus         seekbarView = this.seekbar         seekbarView!!.setOnSeekBarChangeListener(this)     }       override fun onProgressChanged(seekBar: SeekBar, progress: Int,                                    fromUser: Boolean) {         progressView!!.text = progress.toString()         seekbarStatusView!!.text = "Tracking Touch"     }       override fun onStartTrackingTouch(seekBar: SeekBar) {         seekbarStatusView!!.text = "Started Tracking Touch"     }       override fun onStopTrackingTouch(seekBar: SeekBar) {         seekbarStatusView!!.text = "Stopped Tracking Touch"     } }