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RecyclerView实现拖动调整Item位置，侧滑删除Item功能_recycleview.setonitemmovelistener

作者：我家小花儿 | 2024-03-22 09:09:07

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recycleview.setonitemmovelistener

实现长按条目调整位置和侧滑删除功能，核心是ItemTouchHelper类，直接贴代码了。

DefaultItemTouchHelper
  1. public class DefaultItemTouchHelper extends ItemTouchHelper {
  2.     private DefaultItemTouchHelperCallback mDefaultItemTouchHelperCallback;
  3.     private OnItemMoveListenter itemMoveListenter;
  4.  
  5.  
  6.     public DefaultItemTouchHelper() {
  7.         this(new DefaultItemTouchHelperCallback());
  8.     }
  9.  
  10.     private DefaultItemTouchHelper(DefaultItemTouchHelperCallback callback) {
  11.         super(callback);
  12.         this.mDefaultItemTouchHelperCallback = callback;
  13.     }
  14.  
  15.     public void setItemMoveListenter(OnItemMoveListenter itemMoveListenter) {
  16.         mDefaultItemTouchHelperCallback.setCallback(itemMoveListenter);
  17.     }
  18.  
  19.     /**
  20.      * 是否可以滑动删除
  21.      * @param b
  22.      */
  23.     public void setItemViewSwipeEnabled(boolean b) {
  24.         mDefaultItemTouchHelperCallback.setItemViewSwipeEnabled(b);
  25.     }
  26.     /**
  27.         *是否可以长按
  28.         */
  29.     public void setLongPressDragEnabled(boolean b) {
  30.         mDefaultItemTouchHelperCallback.setLongPressDragEnabled(b);
  31.     }
  32. }
DefaultItemTouchHelperCallback
  1. public class DefaultItemTouchHelperCallback extends ItemTouchHelper.Callback {
  2.     private OnItemMoveListenter callback;
  3.     private boolean isLongPressDragEnabled;
  4.     private boolean isItemViewSwipeEnabled;
  5.  
  6.     public void setCallback(OnItemMoveListenter callback) {
  7.         this.callback = callback;
  8.     }
  9.     /**
  10.      * 返回一个复合标志，该标志定义每个状态下启用的移动方向
  11.      * @param recyclerView
  12.      * @param viewHolder
  13.      * @return
  14.      */
  15.     @Override
  16.     public int getMovementFlags(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {
  17.         RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
  18.         if (layoutManager instanceof GridLayoutManager) {
  19.             LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
  20.             if (linearLayoutManager.getOrientation() == LinearLayoutManager.HORIZONTAL) {
  21.                 int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
  22.                 int swipeFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
  23.                 return makeMovementFlags(dragFlags, swipeFlags);
  24.             } else {
  25.                 int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
  26.                 int swipeFlags = ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
  27.                 return makeMovementFlags(dragFlags, swipeFlags);
  28.             }
  29.         } else if (layoutManager instanceof LinearLayoutManager) {
  30.             LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
  31.             if (linearLayoutManager.getOrientation() == LinearLayoutManager.HORIZONTAL) {
  32.                 int dragFlags = ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
  33.                 int swipeFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
  34.                 return makeMovementFlags(dragFlags, swipeFlags);
  35.             } else {
  36.                 int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
  37.                 int swipeFlags = ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
  38.                 return makeMovementFlags(dragFlags, swipeFlags);
  39.             }
  40.         }
  41.         return  makeMovementFlags(0,0);
  42.     }
  43.  
  44.     /**
  45.      * 当ItemTouchHelper希望将拖动的项从原来的位置移动到新位置
  46.      * @param recyclerView
  47.      * @param viewHolder
  48.      * @param target
  49.      * @return
  50.      */
  51.     @Override
  52.     public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
  53.         if (callback!=null){
  54.             return callback.onItemMove(viewHolder,target);
  55.         }
  56.         return false;
  57.     }
  58.  
  59.     /**
  60.      * 当用户滑动ViewHolder时调用
  61.      * @param viewHolder
  62.      * @param direction
  63.      */
  64.     @Override
  65.     public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
  66.         if (callback!=null){
  67.             callback.onItemSwipe(viewHolder,direction);
  68.         }
  69.     }
  70.  
  71.     /**
  72.      * 拖动过程中状态变化的监听
  73.      * ItemTouchHelper.ACTION_STATE_IDLE--闲置状态
  74.      * ItemTouchHelper.ACTION_STATE_SWIPE--刷新状态
  75.      * ItemTouchHelper.ACTION_STATE_DRAG--拖动状态
  76.      * @param viewHolder
  77.      * @param actionState
  78.      */
  79.     @Override
  80.     public void onSelectedChanged(@Nullable RecyclerView.ViewHolder viewHolder, int actionState) {
  81.         super.onSelectedChanged(viewHolder, actionState);
  82.         if (callback!=null && actionState != ItemTouchHelper.ACTION_STATE_IDLE){
  83.             callback.onSelectedChanged(viewHolder,actionState);
  84.         }
  85.     }
  86.  
  87.     /**
  88.      * 完成交互后，调用
  89.      * @param recyclerView
  90.      * @param viewHolder
  91.      */
  92.     @Override
  93.     public void clearView(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {
  94.         super.clearView(recyclerView, viewHolder);
  95.         if (callback!=null ){
  96.             callback.onSelectedChanged(viewHolder,ItemTouchHelper.ACTION_STATE_IDLE);
  97.         }
  98.     }
  99.  
  100.     public void setLongPressDragEnabled(boolean canDrag) {
  101.         this.isLongPressDragEnabled = canDrag;
  102.     }
  103.  
  104.     @Override
  105.     public boolean isLongPressDragEnabled() {
  106.         return isLongPressDragEnabled;
  107.     }
  108.  
  109.     public void setItemViewSwipeEnabled(boolean canSwipe) {
  110.         this.isItemViewSwipeEnabled = canSwipe;
  111.     }
  112.  
  113.     @Override
  114.     public boolean isItemViewSwipeEnabled() {
  115.         return isItemViewSwipeEnabled;
  116.     }
  117. }
OnItemMoveListenter
  1. public interface OnItemMoveListenter {
  2.     boolean onItemMove(RecyclerView.ViewHolder srcHolder, RecyclerView.ViewHolder targetHolder);
  3.     void onItemSwipe(RecyclerView.ViewHolder srcHolder, int direction);
  4.     void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState);
  5. }
SwipeRecycleViewActivity
  1.  
  2. public class SwipeRecycleViewActivity extends AppCompatActivity {
  3.  
  4.     private SwipeRecyclerView mRecyclerView;
  5.     private RecycleItemAdapter mAdapter;
  6.     private ArrayList<String> strings;
  7.  
  8.     @Override
  9.     protected void onCreate(Bundle savedInstanceState) {
  10.         super.onCreate(savedInstanceState);
  11.         setContentView(R.layout.activity_swipe_recycle_view);
  12.         mRecyclerView = findViewById(R.id.recycle_view);
  13.         mRecyclerView.setLayoutManager(createLayoutManager());
  14.         mRecyclerView.addItemDecoration(createItemDecoration());
  15.         // 长按拖拽，默认关闭
  16.         mRecyclerView.setLongPressDragEnabled(true);
  17.         // 滑动删除，默认关闭
  18.         mRecyclerView.setItemViewSwipeEnabled(true);
  19.         mRecyclerView.setOnItemMoveListener(new OnItemMoveListenter() {
  20.             @Override
  21.             public boolean onItemMove(RecyclerView.ViewHolder srcHolder, RecyclerView.ViewHolder targetHolder) {
  22.                 if (srcHolder.getItemViewType() != targetHolder.getItemViewType()) {
  23.                     return false;
  24.                 }
  25.                 int fromPosition = srcHolder.getAdapterPosition();
  26.                 int toPosition = targetHolder.getAdapterPosition();
  27.                 Collections.swap(strings, fromPosition, toPosition);
  28.                 mAdapter.notifyItemMoved(fromPosition, toPosition);
  29.                 // 返回true表示处理了并可以换位置，返回false表示你没有处理并不能换位置
  30.                 return true;
  31.             }
  32.  
  33.             @Override
  34.             public void onItemSwipe(RecyclerView.ViewHolder srcHolder, int direction) {
  35.                 //左滑、右滑 删除，如果要一个方向删除，getMovementFlags方法中处理
  36.                 int adapterPosition = srcHolder.getAdapterPosition();
  37.                 mAdapter.notifyItemRemoved(adapterPosition);
  38.             }
  39.  
  40.             @Override
  41.             public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
  42.                 if (actionState == ItemTouchHelper.ACTION_STATE_DRAG) {
  43.                     // 拖拽的时候添加一个背景
  44.                     viewHolder.itemView.setBackgroundColor(ContextCompat.getColor(SwipeRecycleViewActivity.this, R.color.white_pressed));
  45.                 } else if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
  46.                 } else if (actionState == ItemTouchHelper.ACTION_STATE_IDLE) {
  47.                     // 在手松开的时候还原背景
  48.                     ViewCompat.setBackground(viewHolder.itemView, ContextCompat.getDrawable(SwipeRecycleViewActivity.this, R.color.white));
  49.                 }
  50.             }
  51.         });
  52.         makeDataList();
  53.         mAdapter = new RecycleItemAdapter(this,strings);
  54.         mRecyclerView.setAdapter(mAdapter);
  55.     }
  56.     private ArrayList<String> makeDataList(){
  57.         strings = new ArrayList<>();
  58.         for (int i=0;i<10;i++){
  59.             strings.add("条目-"+i);
  60.         }
  61.         return strings;
  62.     }
  63.     /**
  64.      * 布局管理类
  65.      *
  66.      * @return
  67.      */
  68.     protected RecyclerView.LayoutManager createLayoutManager() {
  69.         return new LinearLayoutManager(this);
  70.     }
  71.  
  72.     /**
  73.      * 条目效果类
  74.      * @return
  75.      */
  76.     protected RecyclerView.ItemDecoration createItemDecoration() {
  77.         return new SimplePaddingDecoration(this);
  78.     }
  79.     /**
  80.      * 添加条目的间隔效果
  81.      */
  82.     public class SimplePaddingDecoration extends RecyclerView.ItemDecoration {
  83.         private int dividerHeight;
  84.  
  85.         public SimplePaddingDecoration(Context context) {
  86.             dividerHeight = 5;
  87.         }
  88.  
  89.         @Override
  90.         public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
  91.             super.getItemOffsets(outRect, view, parent, state);
  92.             //类似加了一个bottom padding
  93.             outRect.bottom = dividerHeight;
  94.         }
  95.     }
  96. }
RecyclerItemAdapter
  1.  
  2. public class RecyclerItemAdapter extends RecyclerView.Adapter<RecyclerItemAdapter.ViewHolder> {
  3.     private ArrayList<String> mData;
  4.     private Context mContext;
  5.  
  6.     public RecyclerItemAdapter(Context mContext, ArrayList<String> mData) {
  7.         this.mData = mData;
  8.         this.mContext = mContext;
  9.     }
  10.  
  11.     @NonNull
  12.     @Override
  13.     public RecyclerItemAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
  14.         ViewHolder viewHolder = new ViewHolder(View.inflate(mContext, R.layout.item_drag_touch, null));
  15.         return viewHolder;
  16.     }
  17.  
  18.     @Override
  19.     public void onBindViewHolder(@NonNull RecyclerItemAdapter.ViewHolder holder, int position) {
  20.         holder.tvTitle.setText(mData.get(position));
  21.     }
  22.  
  23.     @Override
  24.     public int getItemCount() {
  25.         return mData.size();
  26.     }
  27.     static class ViewHolder extends RecyclerView.ViewHolder{
  28.         private TextView tvTitle;
  29.         public ViewHolder(@NonNull View itemView) {
  30.             super(itemView);
  31.             tvTitle=itemView.findViewById(R.id.tv_title);
  32.         }
  33.     }
  34. }
  1. <?xml version="1.0" encoding="utf-8"?>
  2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3.     xmlns:tools="http://schemas.android.com/tools"
  4.     android:orientation="vertical"
  5.     android:layout_width="match_parent"
  6.     android:layout_height="match_parent"
  7.     tools:context=".activity.RecycleViewDragItemActivity">
  8. <androidx.recyclerview.widget.RecyclerView
  9.     android:id="@+id/recycle_view"
  10.     android:background="@color/white"
  11.     android:layout_width="match_parent"
  12.     android:layout_height="match_parent"/>
  13. </LinearLayout>
  1. <?xml version="1.0" encoding="utf-8"?>
  2. <RelativeLayout
  3.     xmlns:android="http://schemas.android.com/apk/res/android"
  4.     android:layout_width="match_parent"
  5.     android:layout_height="wrap_content"
  6.     android:layout_marginTop="5dp"
  7.     android:layout_marginBottom="5dp"
  8.     android:background="@drawable/select_white"
  9.     android:padding="15dp">
  10.  
  11.     <TextView
  12.         android:id="@+id/tv_title"
  13.         android:layout_width="match_parent"
  14.         android:layout_height="wrap_content"
  15.         android:layout_centerVertical="true"
  16.         android:layout_marginLeft="10dp"
  17.         android:textSize="18dp"/>
  18.  
  19. </RelativeLayout>
  1. <color name="white_pressed">#FFCFCFCF</color>
  2.     <color name="white">#fff</color>

 

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