The Design Support Library includes some great pre-built CoordinatorLayout Behaviors for free, like the SwypeToDismissBehavior<T> which is really easy to implement:

cardview_swipeable.java

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_swipe_behavior);
    mCardView = (CardView) findViewById(R.id.swype_card);

    final SwipeDismissBehavior<CardView>
          swipe = new SwipeDismissBehavior();

    swipe.setSwipeDirection(
         SwipeDismissBehavior.SWIPE_DIRECTION_ANY);

    swipe.setListener(
         new SwipeDismissBehavior.OnDismissListener() {

         @Override
         public void onDismiss(View view) {
               Toast.makeText(Activity.this,
                      "Card swiped !!", Toast.LENGTH_SHORT).show();
         }
      );

      LayoutParams coordinatorParams =
           (LayoutParams) mCardView.getLayoutParams();

       coordinatorParams.setBehavior(swipe);
}