Pedro Assunção

Double click/tap detection on android’s MapView

If there is a cleaner way to do it, please share

1. Override the default MapView with your own implementation;
2. Override the onInterceptTouchEvent method;
3. Check if the last event was also a click and happened close by (say in the last 250ms);
   1. If so,  it’s a double tap; do whatever you want (in this case I zoom in on the last clicked point);
   2. If not, ignore

Here’s the code (Sorry for the formatting mess, but… ):

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import com.google.android.maps.MapView;

public class MyMapView extends MapView {

  private long lastTouchTime = -1;

  public MyMapView(Context context, AttributeSet attrs) {

    super(context, attrs);
  }

  @Override
  public boolean onInterceptTouchEvent(MotionEvent ev) {

    if (ev.getAction() == MotionEvent.ACTION_DOWN) {

      long thisTime = System.currentTimeMillis();
      if (thisTime - lastTouchTime < 250) {

        // Double tap
        this.getController().zoomInFixing((int) ev.getX(), (int) ev.getY());
        lastTouchTime = -1;

      } else {

        // Too slow 
        lastTouchTime = thisTime;
      }
    }

    return super.onInterceptTouchEvent(ev);
  }
}

Related:

1. Double click/tap detection on android’s MapView   If there is a cleaner way to do it,...
2. Android location provider mock So, yeah, I resumed playing around with android, this time...

Tagged with:

Categorised as: computers, software development, tips