Android之RecycleView实现指定范围的拖动效果

 @Override public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) { Log.i(TAG, "onMove viewHolder.getAdapterPosition() is:" + viewHolder.getAdapterPosition()); int itemViewType = viewHolder.getAdapterPosition(); Log.i(TAG, "onMove---------------------------------itemViewType is:" + itemViewType); //    if (itemViewType == 0 || itemViewType == 1 || itemViewType == 16) { //      Log.i(TAG, "onMove---------------------------------itemViewType is:" + itemViewType); //      return false; //    } int fromPosition = viewHolder.getAdapterPosition();//得到拖动ViewHolder的position int toPosition = target.getAdapterPosition();//得到目标ViewHolder的position Log.i(TAG, "onMove---------------------------------fromPosition is:" + fromPosition); Log.i(TAG, "onMove---------------------------------toPosition is:" + toPosition); //这里的position如果不是指定范围内的话，直接返回false，就拖动不到其它位置了 if (DragUtil.INSTANCE.getProhibitDragIndexs().contains(toPosition)) { return false; } itemTouchAdapter.onMove(fromPosition,toPosition); return true; }

 import android.graphics.Canvas; import android.graphics.Color; import android.graphics.drawable.Drawable; import android.util.Log; import androidx.recyclerview.widget.GridLayoutManager; import androidx.recyclerview.widget.ItemTouchHelper; import androidx.recyclerview.widget.RecyclerView; import com.appsinnova.android.keepdrop.manager.FileScanManager; /** * Created by Administrator on 2016/4/12. */ public class MyItemTouchCallback extends ItemTouchHelper.Callback { public static final String TAG = MyItemTouchCallback.class.getSimpleName(); private ItemTouchAdapter itemTouchAdapter; public MyItemTouchCallback(ItemTouchAdapter itemTouchAdapter){ this.itemTouchAdapter = itemTouchAdapter; } @Override public boolean isLongPressDragEnabled() { return false; } @Override public boolean isItemViewSwipeEnabled() { return true; } @Override public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { Log.i(TAG, "getMovementFlags viewHolder.getAdapterPosition() is:" + viewHolder.getAdapterPosition()); int itemViewType = viewHolder.getAdapterPosition(); Log.i(TAG, "---------------------------------itemViewType is:" + itemViewType); //    if (itemViewType == 0 || itemViewType == 1 || itemViewType == 16) { //      Log.i(TAG, "-getMovementFlags--------------------------------itemViewType is:" + itemViewType); //      return makeMovementFlags(0, 0); //    } if (recyclerView.getLayoutManager() instanceof GridLayoutManager) { final int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT; final int swipeFlags = 0; return makeMovementFlags(dragFlags, swipeFlags); } else { final int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN; //final int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END; final int swipeFlags = 0; Log.i(TAG, "makeMovementFlags start"); return makeMovementFlags(dragFlags, swipeFlags); } } @Override public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) { Log.i(TAG, "onMove viewHolder.getAdapterPosition() is:" + viewHolder.getAdapterPosition()); int itemViewType = viewHolder.getAdapterPosition(); Log.i(TAG, "onMove---------------------------------itemViewType is:" + itemViewType); //    if (itemViewType == 0 || itemViewType == 1 || itemViewType == 16) { //      Log.i(TAG, "onMove---------------------------------itemViewType is:" + itemViewType); //      return false; //    } int fromPosition = viewHolder.getAdapterPosition();//得到拖动ViewHolder的position int toPosition = target.getAdapterPosition();//得到目标ViewHolder的position Log.i(TAG, "onMove---------------------------------fromPosition is:" + fromPosition); Log.i(TAG, "onMove---------------------------------toPosition is:" + toPosition); //这里的position如果不是指定范围内的话，直接返回false，就拖动不到其它位置了 if (DragUtil.INSTANCE.getProhibitDragIndexs().contains(toPosition)) { return false; } itemTouchAdapter.onMove(fromPosition,toPosition); return true; } @Override public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) { int position = viewHolder.getAdapterPosition(); itemTouchAdapter.onSwiped(position); } @Override public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) { if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) { //滑动时改变Item的透明度 final float alpha = 1 - Math.abs(dX) / (float) viewHolder.itemView.getWidth(); viewHolder.itemView.setAlpha(alpha); viewHolder.itemView.setTranslationX(dX); } else { super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive); } } @Override public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) { if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) { if (background == null && bkcolor == -1) { Drawable drawable = viewHolder.itemView.getBackground(); if (drawable == null) { bkcolor = 0; } else { background = drawable; } } viewHolder.itemView.setBackgroundColor(Color.LTGRAY); } super.onSelectedChanged(viewHolder, actionState); } @Override public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { super.clearView(recyclerView, viewHolder); viewHolder.itemView.setAlpha(1.0f); if (background != null) viewHolder.itemView.setBackgroundDrawable(background); if (bkcolor != -1) viewHolder.itemView.setBackgroundColor(bkcolor); //viewHolder.itemView.setBackgroundColor(0); if (onDragListener!=null){ onDragListener.onFinishDrag(); } } private Drawable background = null; private int bkcolor = -1; private OnDragListener onDragListener; public MyItemTouchCallback setOnDragListener(OnDragListener onDragListener) { this.onDragListener = onDragListener; return this; } public interface OnDragListener{ void onFinishDrag(); } public interface ItemTouchAdapter { void onMove(int fromPosition, int toPosition); void onSwiped(int position); } }

 import android.view.GestureDetector; import android.view.MotionEvent; import android.view.View; import androidx.core.view.GestureDetectorCompat; import androidx.recyclerview.widget.RecyclerView; /** * Created by Administrator on 2016/4/14. */ public class OnRecyclerItemClickListener implements RecyclerView.OnItemTouchListener { private GestureDetectorCompat mGestureDetector; private RecyclerView recyclerView; public OnRecyclerItemClickListener(RecyclerView recyclerView){ this.recyclerView = recyclerView; mGestureDetector = new GestureDetectorCompat(recyclerView.getContext(),new ItemTouchHelperGestureListener()); } @Override public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) { mGestureDetector.onTouchEvent(e); return false; } @Override public void onTouchEvent(RecyclerView rv, MotionEvent e) { mGestureDetector.onTouchEvent(e); } @Override public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { } private class ItemTouchHelperGestureListener extends GestureDetector.SimpleOnGestureListener { @Override public boolean onSingleTapUp(MotionEvent e) { View child = recyclerView.findChildViewUnder(e.getX(), e.getY()); if (child!=null) { RecyclerView.ViewHolder vh = recyclerView.getChildViewHolder(child); onItemClick(vh); } return true; } @Override public void onLongPress(MotionEvent e) { View child = recyclerView.findChildViewUnder(e.getX(), e.getY()); if (child!=null) { RecyclerView.ViewHolder vh = recyclerView.getChildViewHolder(child); onLongClick(vh); } } } public void onLongClick(RecyclerView.ViewHolder vh){} public void onItemClick(RecyclerView.ViewHolder vh){} }

 import android.text.TextUtils; import android.util.Log; import android.view.View; import android.widget.ImageView; import org.greenrobot.eventbus.EventBus; import java.util.ArrayList; import java.util.Collections; import java.util.List; import static com.appsinnova.android.keepdrop.recommend.entity.ChannelHead.channelType; public class ChannelManagerAdapter extends BaseMultiItemQuickAdapter implements MyItemTouchCallback.ItemTouchAdapter { public static final String TAG = ChannelManagerAdapter.class.getSimpleName(); public static final int MY_VEDIO_TYPE = 0; public static final int MORE_VEDIO_TYPE = 1; public static final int CAN_EDITABLE = 1; public static final int CAN_NOT_EDITABLE = 0; public List results = null; public ChannelManagerAdapter(List data) { super(data); addItemType(ChannelHead.channelHeadType, R.layout.item_channel_head); addItemType(channelType, R.layout.item_channel); this.results = data; } @Override protected void convert(BaseViewHolder helper, MultiItemEntity item) { switch (helper.getItemViewType()) { } } @Override public void onMove(int fromPosition, int toPosition) { if (fromPosition==results.size()-1 || toPosition==results.size()-1){ return; } if (fromPosition  toPosition; i--) { Collections.swap(results, i, i - 1); } } //这个数据是移动后的数据，会更新原始数据 int size = results.size(); List items = new ArrayList(); RecommendVedioModel recommendVedioModel = SPHelper.getInstance().getObject(SpConstants.RECOMMEND_VEDIO_CATETGORY, RecommendVedioModel.class); for (int i = 0; i 

 channelManagerAdapter = ChannelManagerAdapter(allDatas) val layoutManager = LinearLayoutManager(this) layoutManager.orientation = LinearLayoutManager.VERTICAL channelRecycleview.setLayoutManager(layoutManager) channelRecycleview.setAdapter(channelManagerAdapter) val itemTouchHelper = ItemTouchHelper(MyItemTouchCallback(channelManagerAdapter)) itemTouchHelper.attachToRecyclerView(channelRecycleview) channelRecycleview.addOnItemTouchListener(object : OnRecyclerItemClickListener(channelRecycleview) { override fun onLongClick(vh: RecyclerView.ViewHolder) { LogUtil.i(TAG, "onLongClick vh.layoutPosition is：" + vh.layoutPosition) var index = vh.layoutPosition if (!prohibitDragIndexs.contains(index)) { itemTouchHelper.startDrag(vh) } } })