RepeatTouchListener.java

import android.os.Handler;
import android.view.MotionEvent;
import android.view.SoundEffectConstants;
import android.view.View;
import android.view.View.OnTouchListener;

public abstract class RepeatTouchListener implements OnTouchListener {

	private Handler mHandler;

	private int currentDelay;
	private static final int INITIAL_DELAY = 500;
	private static final int MIN_DELAY = 100;
	private static final double APPROACH_PERCENT = 0.25;
	private static final int THRESHOLD = 10;
	
	private View view;
	
	public RepeatTouchListener(View view) {
		this.view = view;
	}

	@Override
	public boolean onTouch(View v, MotionEvent event) {
		switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			view.playSoundEffect(SoundEffectConstants.CLICK);
			onRepeat();
			if (mHandler != null)
				return true;
			mHandler = new Handler();
			currentDelay = INITIAL_DELAY;

			mHandler.postDelayed(mAction, currentDelay);
			break;
		case MotionEvent.ACTION_UP:
			if (mHandler == null)
				return true;
			mHandler.removeCallbacks(mAction);
			mHandler = null;
			break;
		}
		return false;
	}

	Runnable mAction = new Runnable() {
		@Override
		public void run() {
			view.playSoundEffect(SoundEffectConstants.CLICK);
			int minOffset = (currentDelay - MIN_DELAY);
			if (minOffset < THRESHOLD) {
				currentDelay = MIN_DELAY;
			} else {
				currentDelay = currentDelay
						- (int) (minOffset * APPROACH_PERCENT);
			}
			onRepeat();
			mHandler.postDelayed(this, currentDelay);
		}
	};

	public abstract void onRepeat();

}