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@momvart
Last active August 28, 2021 14:06
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A touch listener that makes a touch-and-hold click trigger functionality for you view in Android.
import android.view.MotionEvent
import android.view.View
import androidx.core.view.postDelayed
import kotlin.math.max
class ButtonHoldClickTriggerTouchListener(
private val startDelay: Long = STANDARD_DELAY,
private val minDelay: Long = STANDARD_MIN_DELAY_BETWEEN_TRIGGERS,
private val delayReduce: Long = STANDARD_DELAY_REDUCE
) : View.OnTouchListener {
companion object {
const val STANDARD_DELAY = 350L
const val STANDARD_MIN_DELAY_BETWEEN_TRIGGERS = 50L
const val STANDARD_DELAY_REDUCE = 100L
}
private var isActive = false
private var performedOnce = false
override fun onTouch(v: View?, event: MotionEvent?): Boolean {
if (v == null || event == null) return false
when (event.action) {
MotionEvent.ACTION_DOWN -> {
isActive = true
performedOnce = false
performRepetitiveClick(v, startDelay)
v.isPressed = true
}
MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
isActive = false
if (!performedOnce) //Making sure at least one time click is called
v.performClick()
v.isPressed = false
}
else -> return false
}
return true
}
private fun performRepetitiveClick(view: View, delay: Long) {
view.postDelayed(delay) {
if (!isActive)
return@postDelayed
performedOnce = true
view.performClick()
performRepetitiveClick(view, max(minDelay, delay - delayReduce)) //Preventing triggers faster than minDelay
}
}
}
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