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

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

  @Overridepublic 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);}

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