DebounceClickListener

DebouncedClickListener.kt

import android.view.View

/**
 * Created by timoptr on 25/11/2018.
 */

/**
 * This class is an Helper to avoid double click (spam) on a view click listener
 * It will avoid it by dismiss click which are not separate by at least [DOUBLE_CLICK_TIMEOUT]
 *
 * @param click the clickListener to apply when ot respect the constraint of time
 */
class DebouncedClickListener(val click: (v: View) -> Unit) : View.OnClickListener {

    private val DOUBLE_CLICK_TIMEOUT = 500L
    private var lastClick: Long = 0

    /**
     * Checker method, the first click is done (call [click] and store the last click time into [lastClick])
     * when a second click arrived verify that the minimum time [DOUBLE_CLICK_TIMEOUT] is pass otherwise drop the click
     *
     * @param v the view where the click appear
     */
    override fun onClick(v: View) {
        if (getLastClickTimeout() > DOUBLE_CLICK_TIMEOUT) {
            lastClick = System.currentTimeMillis()
            click(v)
        }
    }

    private fun getLastClickTimeout(): Long {
        return System.currentTimeMillis() - lastClick
    }
}

DebouncedClickListenerExtension.kt

import android.view.View

fun View.setDebouncedClickListener(click: (v: View) -> Unit) {
    setOnClickListener(DebouncedClickListener(click))
}