Helper class to get callback for single and double click on a view in android

DoubleClickListener.kt

import android.os.Handler;
import android.os.SystemClock;
import android.view.View;
​
public abstract class DoubleClickListener  implements View.OnClickListener {
    private static final long DEFAULT_QUALIFICATION_SPAN = 200;
    private boolean isSingleEvent;
    private final long doubleClickQualificationSpanInMillis;
    private long timestampLastClick;
    private final Handler handler;
    private final Runnable runnable;
​
    public DoubleClickListener() {
        doubleClickQualificationSpanInMillis = DEFAULT_QUALIFICATION_SPAN;
        timestampLastClick = 0;
        handler = new Handler();
        runnable = () -> {
            if (isSingleEvent) {
                onSingleClick();
            }
        };
    }
​
    @Override
    public void onClick(View v) {
        if((SystemClock.elapsedRealtime() - timestampLastClick) < doubleClickQualificationSpanInMillis) {
            isSingleEvent = false;
            handler.removeCallbacks(runnable);
            onDoubleClick();
            return;
        }
​
        isSingleEvent = true;
        handler.postDelayed(runnable, DEFAULT_QUALIFICATION_SPAN);
        timestampLastClick = SystemClock.elapsedRealtime();
    }
​
    public abstract void onDoubleClick();
    public abstract void onSingleClick();
}