RxAndroid+Retrofit+GreenDao+MVP框架---通用基类封装（三）

打算分为通用的方法，基类封装；网络请求框架封装（RxAndroid+Retrofit）；数据库操作封装（GreenDao）；

查看完整框架可以到GitHub下载https://github.com/850125665/WeatherApp

RecycleView的长按，单击，drag，swipe封装

-使用现成API可以轻松实现，item的长按，点击，drag，swipe等方法。主要用上GestureDetectorCompat，ItemTouchHelper两个API

TouchListener.java

public class TouchListener implements RecyclerView.OnItemTouchListener {

private String TAG = getClass().getSimpleName();

private GestureDetectorCompat gestureDetectorCompat;

private RecyclerView recyclerView;

private OnClickListener onClickListener;

private ItemTouchHelper itemTouchHelper;

private List list;

private RecyclerView.Adapter adapter;
private SwipeRefreshLayout swipeRefreshLayout;
ViewPager viewPager;

public void setOnClickListener(OnClickListener onClickListener) {
    this.onClickListener = onClickListener;
}

public TouchListener(RecyclerView recyclerView, final List list, final RecyclerView.Adapter adapter) {
    this.list = list;
    this.adapter = adapter;
    this.recyclerView = recyclerView;
    gestureDetectorCompat = new GestureDetectorCompat(recyclerView.getContext(), new ItemTouchHelpGestureListener());
    List<ViewParent> viewParents = new ArrayList<>();
    viewParents = AppMethods.getParentView(recyclerView.getParent(), viewParents);
    for (ViewParent parent : viewParents) {
        if (parent instanceof ViewPager) {
            viewPager = (ViewPager) parent;
        } else if (parent instanceof SwipeRefreshLayout) {
            swipeRefreshLayout = (SwipeRefreshLayout) parent;
        }
    }

}

float downX = 0;
float downY = 0;

@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {

    switch (e.getAction()) {
        case MotionEvent.ACTION_DOWN:
            downX = e.getX();
            downY = e.getY();
            if (viewPager != null) {
                viewPager.requestDisallowInterceptTouchEvent(true);
            }
            if (swipeRefreshLayout != null) {
                swipeRefreshLayout.requestDisallowInterceptTouchEvent(true);
            }
            break;
        case MotionEvent.ACTION_MOVE:

            if (e.getX() - downX >0) {
                if (viewPager != null) {

                    viewPager.requestDisallowInterceptTouchEvent(false);
                }
                if (swipeRefreshLayout != null) {

                    swipeRefreshLayout.requestDisallowInterceptTouchEvent(false);
                }
            }

//
break;
case MotionEvent.ACTION_UP:
if (viewPager != null) {

                viewPager.requestDisallowInterceptTouchEvent(false);
            }
            if (swipeRefreshLayout != null) {

                swipeRefreshLayout.requestDisallowInterceptTouchEvent(false);
            }
            break;
    }
    boolean b = gestureDetectorCompat.onTouchEvent(e);
    return b;
}


@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
    gestureDetectorCompat.onTouchEvent(e);
}

@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

}

public class ItemTouchHelpGestureListener extends GestureDetector.SimpleOnGestureListener {
    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        View childViewUnder = recyclerView.findChildViewUnder(e.getX(), e.getY());
        if (childViewUnder != null) {
            RecyclerView.ViewHolder childViewHolder = recyclerView.getChildViewHolder(childViewUnder);
            int childLayoutPosition = recyclerView.getChildLayoutPosition(childViewUnder);
            if (onClickListener != null) {

                onClickListener.onItemClickListener(childViewHolder, childLayoutPosition);
            }
            return false;

        }
        return false;
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {

        LogUtils.d(TAG, "onScroll" + "distanceX" + distanceX + " distanceY" + distanceY);

        return false;
    }

    @Override
    public void onShowPress(MotionEvent e) {
        LogUtils.d(TAG, "onShowPress");
    }

    @Override
    public void onLongPress(MotionEvent e) {
        View childViewUnder = recyclerView.findChildViewUnder(e.getX(), e.getY());
        if (childViewUnder != null) {
            RecyclerView.ViewHolder childViewHolder = recyclerView.getChildViewHolder(childViewUnder);
            int childLayoutPosition = recyclerView.getChildLayoutPosition(childViewUnder);
            if (onClickListener != null) {

                onClickListener.onItemLongClickListener(childViewHolder, childLayoutPosition);
               if(swipeRefreshLayout!=null){
                   swipeRefreshLayout.setEnabled(false);
               }
            }

        }


    }
}

public interface OnClickListener {
    <T extends RecyclerView.ViewHolder> void onItemClickListener(T t, int position);

    <T extends RecyclerView.ViewHolder> void onItemLongClickListener(T t, int position);
}

public void dragItem(final SwipeRefreshLayout swipeRefreshLayout, final DragItemListener dragItemListener) {
    this.swipeRefreshLayout = swipeRefreshLayout;
    itemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.Callback() {
        @Override
        public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
            if(swipeRefreshLayout!=null){
                swipeRefreshLayout.setEnabled(false);
            }
            RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
            int dragFlag = 0;
            int swipeFlag = 0;
            if (layoutManager instanceof LinearLayoutManager) {

                dragFlag = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
                swipeFlag = ItemTouchHelper.START;
            } else if (layoutManager instanceof GridLayoutManager) {
                dragFlag = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.START | ItemTouchHelper.END;
            }
            return makeMovementFlags(dragFlag, swipeFlag);
        }

        @Override
        public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
            LogUtils.d(TAG, "onMove");
            int from = viewHolder.getAdapterPosition();
            int to = target.getAdapterPosition();
            if(to<=(list.size()-1) && from<=(list.size()-1)){
                list.add(to, list.remove(from));
                adapter.notifyItemMoved(from, to);
                return true;
            }else{
                return false;
            }
        }


        @Override
        public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
            int adapterPosition = viewHolder.getAdapterPosition();
            if(adapterPosition<=(list.size()-1)){
                dragItemListener.swipe(adapterPosition);
                adapter.notifyItemRemoved(adapterPosition);
                list.remove(adapterPosition);
            }


            LogUtils.d(TAG, "onSwiped");
        }

        @Override
        public void onMoved(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, int fromPos, RecyclerView.ViewHolder target, int toPos, int x, int y) {
            super.onMoved(recyclerView, viewHolder, fromPos, target, toPos, x, y);
            dragItemListener.drag();
            LogUtils.d(TAG, "onMoved");

        }

        @Override
        public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
            super.onSelectedChanged(viewHolder, actionState);

            LogUtils.d(TAG, "onSelectedChanged");
        }

        @Override
        public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
            super.clearView(recyclerView, viewHolder);
            LogUtils.d(TAG, "clearView");
            if (swipeRefreshLayout != null) {
                if (!swipeRefreshLayout.isEnabled()) {
                    AppInfo.getAppInstant().getUiHandler().postDelayed(new TimerTask() {
                        @Override
                        public void run() {
                            swipeRefreshLayout.setEnabled(true);
                        }
                    }, 200);
                }


            }
        }
    });
    itemTouchHelper.attachToRecyclerView(recyclerView);
}

public interface DragItemListener{
    public void drag();
    public void swipe(int position);
}

}

-GestureDetector类对外提供了两个接口：OnGestureListener，OnDoubleTapListener，还有一个内部类SimpleOnGestureListener；SimpleOnGestureListener类是GestureDetector提供给我们的一个更方便的响应不同手势的类，它实现了上述两个接口，该类是static class，也就是说它实际上是一个外部类，我们可以在外部继承这个类，重写里面的手势处理方法。因此实现手势识别有两种方法，一种实现OnGestureListener接口，另一种是使用SimpleOnGestureListener类。
OnGestureListener有下面的几个动作：
按下（onDown）： 刚刚手指接触到触摸屏的那一刹那，就是触的那一下。
抛掷（onFling）： 手指在触摸屏上迅速移动，并松开的动作。
长按（onLongPress）： 手指按在持续一段时间，并且没有松开。
滚动（onScroll）： 手指在触摸屏上滑动。
按住（onShowPress）： 手指按在触摸屏上，它的时间范围在按下起效，在长按之前。
抬起（onSingleTapUp）：手指离开触摸屏的那一刹那。
我们用的SimpleOnGestureListener内部类去实现单击，和长按

public class ItemTouchHelpGestureListener extends GestureDetector.SimpleOnGestureListener {
    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        View childViewUnder = recyclerView.findChildViewUnder(e.getX(), e.getY());
        if (childViewUnder != null) {
            RecyclerView.ViewHolder childViewHolder = recyclerView.getChildViewHolder(childViewUnder);
            int childLayoutPosition = recyclerView.getChildLayoutPosition(childViewUnder);
            if (onClickListener != null) {

                onClickListener.onItemClickListener(childViewHolder, childLayoutPosition);
            }
            return false;

        }
        return false;
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {

        LogUtils.d(TAG, "onScroll" + "distanceX" + distanceX + " distanceY" + distanceY);

        return false;
    }

    @Override
    public void onShowPress(MotionEvent e) {
        LogUtils.d(TAG, "onShowPress");
    }

    @Override
    public void onLongPress(MotionEvent e) {
        View childViewUnder = recyclerView.findChildViewUnder(e.getX(), e.getY());
        if (childViewUnder != null) {
            RecyclerView.ViewHolder childViewHolder = recyclerView.getChildViewHolder(childViewUnder);
            int childLayoutPosition = recyclerView.getChildLayoutPosition(childViewUnder);
            if (onClickListener != null) {

                onClickListener.onItemLongClickListener(childViewHolder, childLayoutPosition);
               if(swipeRefreshLayout!=null){
                   swipeRefreshLayout.setEnabled(false);
               }
            }

        }


    }
}

-我们new ItemTouchHelper()来实现drag与swipe
getMovementFlags方法返回的参数是要实现drag还是swipe，我们判断是LinearLayoutManager时只返回drag标识。GridLayoutManager时返回drag与swipe。
onMove方法是drag的实现
onSwiped是swipe的实现
代码简单就不详细讲了

  itemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.Callback() {
        @Override
        public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
            if(swipeRefreshLayout!=null){
                swipeRefreshLayout.setEnabled(false);
            }
            RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
            int dragFlag = 0;
            int swipeFlag = 0;
            if (layoutManager instanceof LinearLayoutManager) {

                dragFlag = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
                swipeFlag = ItemTouchHelper.START;
            } else if (layoutManager instanceof GridLayoutManager) {
                dragFlag = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.START | ItemTouchHelper.END;
            }
            return makeMovementFlags(dragFlag, swipeFlag);
        }

        @Override
        public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
            LogUtils.d(TAG, "onMove");
            int from = viewHolder.getAdapterPosition();
            int to = target.getAdapterPosition();
            if(to<=(list.size()-1) && from<=(list.size()-1)){
                list.add(to, list.remove(from));
                adapter.notifyItemMoved(from, to);
                return true;
            }else{
                return false;
            }
        }


        @Override
        public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
            int adapterPosition = viewHolder.getAdapterPosition();
            if(adapterPosition<=(list.size()-1)){
                dragItemListener.swipe(adapterPosition);
                adapter.notifyItemRemoved(adapterPosition);
                list.remove(adapterPosition);
            }


            LogUtils.d(TAG, "onSwiped");
        }

        @Override
        public void onMoved(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, int fromPos, RecyclerView.ViewHolder target, int toPos, int x, int y) {
            super.onMoved(recyclerView, viewHolder, fromPos, target, toPos, x, y);
            dragItemListener.drag();
            LogUtils.d(TAG, "onMoved");

        }

        @Override
        public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
            super.onSelectedChanged(viewHolder, actionState);

            LogUtils.d(TAG, "onSelectedChanged");
        }

        @Override
        public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
            super.clearView(recyclerView, viewHolder);
            LogUtils.d(TAG, "clearView");
            if (swipeRefreshLayout != null) {
                if (!swipeRefreshLayout.isEnabled()) {
                    AppInfo.getAppInstant().getUiHandler().postDelayed(new TimerTask() {
                        @Override
                        public void run() {
                            swipeRefreshLayout.setEnabled(true);
                        }
                    }, 200);
                }


            }
        }
    });
    itemTouchHelper.attachToRecyclerView(recyclerView);

这个类还做了与viewpage和SwipeRefreshLayout一起用的时候drag和swipe与这两个控件有事件冲突，做了事件冲突处理，主要是在onInterceptTouchEvent方法做处理

  @Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {

    switch (e.getAction()) {
        case MotionEvent.ACTION_DOWN:
            downX = e.getX();
            downY = e.getY();
            if (viewPager != null) {
                viewPager.requestDisallowInterceptTouchEvent(true);
            }
            break;
        case MotionEvent.ACTION_MOVE:

            if (e.getX() - downX >0) {
                if (viewPager != null) {

                    viewPager.requestDisallowInterceptTouchEvent(false);
                }
            }

//
break;
case MotionEvent.ACTION_UP:
if (viewPager != null) {

                viewPager.requestDisallowInterceptTouchEvent(false);
            }
            break;
    }
    return gestureDetectorCompat.onTouchEvent(e);
}