RecyclerView– 侧滑删除和拖动排序详解手机开发

public class DragItemAnimatorActivity extends AppCompatActivity { 
    private WrapRecyclerView mRecyclerView; 
    private HomeAdapter mAdapter; 
   
    private List<ItemBean> mItems = new ArrayList<ItemBean>(); 
   
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_recycler_view); 
  
        initData(); 
  
        mRecyclerView = (WrapRecyclerView) findViewById(R.id.recycler_view); 
  
  
        mAdapter = new HomeAdapter(this, mItems); 
  
        mRecyclerView.setLayoutManager(new GridLayoutManager(this, 4)); 
        mRecyclerView.setAdapter(mAdapter); 
  
        mRecyclerView.addItemDecoration(new DividerGridItemDecoration(this)); 
  
        final DefaultItemAnimator itemAnimator = new DefaultItemAnimator(); 
        mRecyclerView.setItemAnimator(itemAnimator); 
  
        // 实现左边侧滑删除 和 拖动排序  
        ItemTouchHelper itemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.Callback() { 
            @Override 
            public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { 
                // 获取触摸响应的方向   包含两个 1.拖动dragFlags 2.侧滑删除swipeFlags 
                // 代表只能是向左侧滑删除，当前可以是这样ItemTouchHelper.LEFT|ItemTouchHelper.RIGHT  
                int swipeFlags = ItemTouchHelper.LEFT; 
  
  
                // 拖动  
                int dragFlags = 0; 
                if (recyclerView.getLayoutManager() instanceof GridLayoutManager) { 
                    // GridView 样式四个方向都可以  
                    dragFlags = ItemTouchHelper.UP | ItemTouchHelper.LEFT | 
                            ItemTouchHelper.DOWN | ItemTouchHelper.RIGHT; 
                } else { 
                    // ListView 样式不支持左右  
                    dragFlags = ItemTouchHelper.UP | 
                            ItemTouchHelper.DOWN; 
                } 
  
                return makeMovementFlags(dragFlags, swipeFlags); 
            } 
  
            /**  
             * 拖动的时候不断的回调方法 
             */  
            @Override 
            public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) { 
                // 获取原来的位置  
                int fromPosition = viewHolder.getAdapterPosition(); 
                // 得到目标的位置  
                int targetPosition = target.getAdapterPosition(); 
                if (fromPosition > targetPosition) { 
                    for (int i = fromPosition; i < targetPosition; i++) { 
                        Collections.swap(mItems, i, i + 1);// 改变实际的数据集  
                    } 
                } else { 
                    for (int i = fromPosition; i > targetPosition; i--) { 
                        Collections.swap(mItems, i, i - 1);// 改变实际的数据集  
                    } 
                } 
                mAdapter.notifyItemMoved(fromPosition, targetPosition); 
                return true; 
            } 
  
            /**  
             * 侧滑删除后会回调的方法 
             */  
            @Override 
            public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) { 
                // 获取当前删除的位置  
                int position = viewHolder.getAdapterPosition(); 
                mItems.remove(position); 
                // adapter 更新notify当前位置删除  
                mAdapter.notifyItemRemoved(position); 
            } 
  
            /**  
             * 拖动选择状态改变回调 
             */  
            @Override 
            public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) { 
                if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) { 
                    // ItemTouchHelper.ACTION_STATE_IDLE 看看源码解释就能理解了 
                    // 侧滑或者拖动的时候背景设置为灰色  
                    viewHolder.itemView.setBackgroundColor(Color.GRAY); 
                } 
            } 
  
  
            /**  
             * 回到正常状态的时候回调 
             */ 
            @Override 
            public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { 
                // 正常默认状态下背景恢复默认 
                viewHolder.itemView.setBackgroundColor(0); 
                ViewCompat.setTranslationX(viewHolder.itemView,0); 
            } 
        }); 
        // 这个就不多解释了，就这么attach 
        itemTouchHelper.attachToRecyclerView(mRecyclerView); 
    } 
 
    protected void initData() { 
        for (int i = 0; i < 10; i++) { 
            mItems.add(new ItemBean(i * 8 + 0, "收款", R.drawable.takeout_ic_category_brand)); 
            mItems.add(new ItemBean(i * 8 + 1, "转账", R.drawable.takeout_ic_category_flower)); 
            mItems.add(new ItemBean(i * 8 + 2, "余额宝", R.drawable.takeout_ic_category_fruit)); 
            mItems.add(new ItemBean(i * 8 + 3, "手机充值", R.drawable.takeout_ic_category_medicine)); 
            mItems.add(new ItemBean(i * 8 + 4, "医疗", R.drawable.takeout_ic_category_motorcycle)); 
            mItems.add(new ItemBean(i * 8 + 5, "彩票", R.drawable.takeout_ic_category_public)); 
            mItems.add(new ItemBean(i * 8 + 6, "电影", R.drawable.takeout_ic_category_store)); 
            mItems.add(new ItemBean(i * 8 + 7, "游戏", R.drawable.takeout_ic_category_sweet)); 
        } 
        mItems.add(new ItemBean(mItems.size(), "更多", R.drawable.takeout_ic_more)); 
    } 
 
    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
        getMenuInflater().inflate(R.menu.main, menu); 
        return super.onCreateOptionsMenu(menu); 
    } 
 
    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
        switch (item.getItemId()) { 
            case R.id.id_action_gridview: 
                mRecyclerView.setLayoutManager(new GridLayoutManager(this, 4)); 
                break; 
            case R.id.id_action_listview: 
                mRecyclerView.setLayoutManager(new LinearLayoutManager(this)); 
                break; 
        } 
        return true; 
    } 
 
    class HomeAdapter extends CommonRecyclerAdapter<ItemBean> { 
 
 
        public HomeAdapter(Context context, List<ItemBean> data) { 
            super(context, data, R.layout.item_drag_sort_delete); 
        } 
 
        @Override 
        public void convert(ViewHolder holder, ItemBean item) { 
            holder.setText(R.id.item_text, item.text); 
            holder.setImageResource(R.id.item_img, item.icon); 
        } 
    } 
 
    public class ItemBean { 
        public int id; 
        public String text; 
        public int icon; 
 
        public ItemBean(int id, String text, int icon) { 
            this.id = id; 
            this.text = text; 
            this.icon = icon; 
        } 
    } 
}