content: package net.nullsum.audinaut.view;
  
  import android.content.Context;
  import android.util.AttributeSet;
  import android.view.MotionEvent;
  
  import androidx.appcompat.widget.AppCompatImageButton;
  
  public class AutoRepeatButton extends AppCompatImageButton {
  
      private static final long initialRepeatDelay = 1000;
      private static final long repeatIntervalInMilliseconds = 300;
      private boolean doClick = true;
      private Runnable repeatEvent = null;
  
      private final Runnable repeatClickWhileButtonHeldRunnable = new Runnable() {
          @Override
          public void run() {
              doClick = false;
              //Perform the present repetition of the click action provided by the user
              // in setOnClickListener().
              if (repeatEvent != null)
                  repeatEvent.run();
  
              //Schedule the next repetitions of the click action, using a faster repeat
              // interval than the initial repeat delay interval.
              postDelayed(repeatClickWhileButtonHeldRunnable, repeatIntervalInMilliseconds);
          }
      };
  
      public AutoRepeatButton(Context context, AttributeSet attrs, int defStyle) {
          super(context, attrs, defStyle);
          commonConstructorCode();
      }
  
      public AutoRepeatButton(Context context, AttributeSet attrs) {
          super(context, attrs);
          commonConstructorCode();
      }
  
      public AutoRepeatButton(Context context) {
          super(context);
          commonConstructorCode();
      }
  
      private void commonConstructorCode() {
          this.setOnTouchListener((v, event) -> {
              int action = event.getAction();
              if (action == MotionEvent.ACTION_DOWN) {
                  doClick = true;
                  //Just to be sure that we removed all callbacks,
                  // which should have occurred in the ACTION_UP
                  removeCallbacks(repeatClickWhileButtonHeldRunnable);
  
                  //Schedule the start of repetitions after a one half second delay.
                  postDelayed(repeatClickWhileButtonHeldRunnable, initialRepeatDelay);
  
                  setPressed(true);
              } else if (action == MotionEvent.ACTION_UP) {
                  //Cancel any repetition in progress.
                  removeCallbacks(repeatClickWhileButtonHeldRunnable);
  
                  if (doClick || repeatEvent == null) {
                      performClick();
                  }
  
                  setPressed(false);
              }
  
              //Returning true here prevents performClick() from getting called
              // in the usual manner, which would be redundant, given that we are
              // already calling it above.
              return true;
          });
      }
  
      public void setOnRepeatListener(Runnable runnable) {
          repeatEvent = runnable;
      }
  }
  