Java 类android.support.design.widget.SwipeDismissBehavior 实例源码

private void setupSwipe(ItemTrackedBeaconBinding beaconBinding) {

        final SwipeDismissBehavior<CardView> swipe = new SwipeDismissBehavior();
        swipe.setSwipeDirection(SwipeDismissBehavior.SWIPE_DIRECTION_ANY);
        swipe.setListener(new SwipeDismissBehavior.OnDismissListener() {
            @Override
            public void onDismiss(View view) {
                Log.d(Constants.TAG, "Swipe +");
            }

            @Override
            public void onDragStateChanged(int state) {
            }
        });

    }

@Override protected void subscribeActual(Observer<? super View> observer) {
  if (!checkMainThread(observer)) {
    return;
  }
  if (!(view.getLayoutParams() instanceof LayoutParams)) {
    throw new IllegalArgumentException("The view is not in a Coordinator Layout.");
  }
  LayoutParams params = (LayoutParams) view.getLayoutParams();
  final SwipeDismissBehavior behavior = (SwipeDismissBehavior) params.getBehavior();
  if (behavior == null) {
    throw new IllegalStateException("There's no behavior set on this view.");
  }
  Listener listener = new Listener(behavior, observer);
  observer.onSubscribe(listener);
  behavior.setListener(listener);
}

@Test public void dismisses() {
  ((CoordinatorLayout.LayoutParams) view.getLayoutParams()).setBehavior(
      new SwipeDismissBehavior());

  RecordingObserver<View> o = new RecordingObserver<>();
  RxSwipeDismissBehavior.dismisses(view)
      .subscribeOn(AndroidSchedulers.mainThread())
      .subscribe(o);
  o.assertNoMoreEvents(); // No initial value.

  onView(withId(1)).perform(swipeRight());
  assertEquals(view, o.takeNext());

  o.dispose();

  onView(withId(1)).perform(swipeRight());
  o.assertNoMoreEvents();
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_swipe_behavior);


    final SwipeDismissBehavior swipe = new SwipeDismissBehavior();
    swipe.setSwipeDirection(SwipeDismissBehavior.SWIPE_DIRECTION_ANY);
    swipe.setListener(new SwipeDismissBehavior.OnDismissListener() {
        @Override public void onDismiss(View view) {
            Toast.makeText(SwipeBehaviorExampleActivity.this,
                "Card swiped !!", Toast.LENGTH_SHORT).show();
        }

        @Override public void onDragStateChanged(int state) {}
    });

    CardView cardView = (CardView) findViewById(R.id.swype_card);
    LayoutParams coordinatorParams = (LayoutParams) cardView.getLayoutParams();
    coordinatorParams.setBehavior(swipe);
}

private void initBehavior() {
    swipeDismissBehavior = new SwipeDismissBehavior();
    swipeDismissBehavior.setSwipeDirection(SwipeDismissBehavior.SWIPE_DIRECTION_ANY);
    swipeDismissBehavior.setListener(onDismissListener);
    CoordinatorLayout.LayoutParams coordinatorParams = (CoordinatorLayout.LayoutParams) findViewById(R.id.textview).getLayoutParams();
    coordinatorParams.setBehavior(swipeDismissBehavior);

    swipeDismissBehavior.setDragDismissDistance(0.5F);
    swipeDismissBehavior.setStartAlphaSwipeDistance(0F);
    swipeDismissBehavior.setEndAlphaSwipeDistance(0.5F);
    swipeDismissBehavior.setSensitivity(0);
    swipeDismissBehavior.setSwipeDirection(SwipeDismissBehavior.SWIPE_DIRECTION_START_TO_END);
}

public CardViewHolder(final View itemView) {
    super(itemView);
    userName = (TextView) itemView.findViewById(R.id.user_name);
    userIcon = (ImageView) itemView.findViewById(R.id.user_icon);
    image = (ImageView) itemView.findViewById(R.id.image);

    card = (CardView) itemView.findViewById(R.id.card);
    card.setOnClickListener(this);

    // ドラッグして消えるBehaviorを取り付ける。
    // スワイプする要素は、親ビューがCoordinatorLayoutである必要がある。
    SwipeDismissBehavior behavior = new SwipeDismissBehavior();
    behavior.setStartAlphaSwipeDistance(0.1f);
    behavior.setEndAlphaSwipeDistance(0.6f);
    behavior.setSwipeDirection(SwipeDismissBehavior.SWIPE_DIRECTION_START_TO_END);
    behavior.setListener(new SwipeDismissBehavior.OnDismissListener() {
        @Override
        public void onDismiss(View view) {
            if (listener != null) {
                listener.onCardDismiss(CardViewHolder.this);
            }
        }

        @Override
        public void onDragStateChanged(int state) {
            if (listener != null) {
                listener.onDragStateChanged(CardViewHolder.this, state);
            }
        }
    });
    final ViewGroup.LayoutParams cardViewLayoutParams = card.getLayoutParams();
    ((CoordinatorLayout.LayoutParams) cardViewLayoutParams).setBehavior(behavior);
}

/**
 * @return if the view is being being dragged or settled by {@link SwipeDismissBehavior}.
 */
private boolean isBeingDragged() {
    final ViewGroup.LayoutParams lp = mView.getLayoutParams();
    if (lp instanceof CoordinatorLayout.LayoutParams) {
        final CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) lp;
        final CoordinatorLayout.Behavior behavior = layoutParams.getBehavior();
        if (behavior instanceof SwipeDismissBehavior) {
            return ((SwipeDismissBehavior) behavior).getDragState() != SwipeDismissBehavior.STATE_IDLE;
        }
    }
    return false;
}

/**
 * @return if the view is being being dragged or settled by {@link SwipeDismissBehavior}.
 */
private boolean isBeingDragged() {
    final ViewGroup.LayoutParams lp = mView.getLayoutParams();

    if (lp instanceof CoordinatorLayout.LayoutParams) {
        final CoordinatorLayout.LayoutParams cllp = (CoordinatorLayout.LayoutParams) lp;
        final CoordinatorLayout.Behavior behavior = cllp.getBehavior();

        if (behavior instanceof SwipeDismissBehavior) {
            return ((SwipeDismissBehavior) behavior).getDragState()
                    != SwipeDismissBehavior.STATE_IDLE;
        }
    }
    return false;
}

@SuppressWarnings("rawtypes")
private boolean isBeingDragged() {
    final ViewGroup.LayoutParams lp = mView.getLayoutParams();
    if (lp instanceof CoordinatorLayout.LayoutParams) {
        final CoordinatorLayout.LayoutParams cllp = (CoordinatorLayout.LayoutParams) lp;
        final CoordinatorLayout.Behavior behavior = cllp.getBehavior();
        if (behavior instanceof SwipeDismissBehavior) {
            return ((SwipeDismissBehavior) behavior).getDragState() != SwipeDismissBehavior.STATE_IDLE;
        }
    }
    return false;
}

@Override
public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
    if(dependency instanceof TopCardView) {
        CoordinatorLayout.LayoutParams params  = (CoordinatorLayout.LayoutParams) dependency.getLayoutParams();
        params.setBehavior(swipeDismissBehavior);
        swipeDismissBehavior.setSwipeDirection(SwipeDismissBehavior.SWIPE_DIRECTION_START_TO_END);
        swipeDismissBehavior.setStartAlphaSwipeDistance(0.1f);
        swipeDismissBehavior.setEndAlphaSwipeDistance(0.9f);
        swipeDismissBehavior.setDragDismissDistance(0.8f);
        return true;
    }
    return false;
}

Listener(SwipeDismissBehavior swipeDismissBehavior, Observer<? super View> observer) {
  this.swipeDismissBehavior = swipeDismissBehavior;
  this.observer = observer;
}