Android uses ItemTouchHelper for sideslip deletion and drag

This article example for everyone to share how to use ItemTouchHelper to achieve sideslip deletion and drag the specific code for your reference, the specific content is as follows

1. Define a simple bean class:

public class ImgText {
  public int resId;
  public String des;
}

2. Implement an RecyclerView. Adapter

public class SwipeRecyclerAdapter extends RecyclerView.Adapter<SwipeRecyclerAdapter.MyHolder> {

  private List<ImgText> mList;

  public SwipeRecyclerAdapter(List<ImgText> list) {
    mList = list;
  }

  @Override
  public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {

    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_swipe_recycler, parent, false);
    return new MyHolder(view);
  }

  @Override
  public void onBindViewHolder(MyHolder holder, int position) {
    ImgText imgText = mList.get(position);
    holder.img.setImageResource(imgText.resId);
    holder.des.setText(imgText.des);
  }

  @Override
  public int getItemCount() {
    return mList.size();
  }

  public class MyHolder extends RecyclerView.ViewHolder {

    private ImageView img;
    private TextView des;

    public MyHolder(View itemView) {
      super(itemView);
      img = (ImageView) itemView.findViewById(R.id.img);
      des = (TextView) itemView.findViewById(R.id.text);
    }
  }
}

3. Draw a dividing line:

public class DividerItemDecoration extends RecyclerView.ItemDecoration {
  private static final int[] ATTRS = new int[]{android.R.attr.listDivider};
  public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
  public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
  private Drawable mDivider;
  private int mOrientation;
  public DividerItemDecoration(Context context, int orientation) {
    final TypedArray a = context.obtainStyledAttributes(ATTRS);
    mDivider = a.getDrawable(0);
    a.recycle();
    setOrientation(orientation);
  }
  public void setOrientation(int orientation) {
    if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
      throw new IllegalArgumentException("invalid orientation");
    }
    mOrientation = orientation;
  }
  @Override
  public void onDraw(Canvas c, RecyclerView parent) {
    if (mOrientation == VERTICAL_LIST) {
      drawVertical(c, parent);
    } else {
      drawHorizontal(c, parent);
    }
  }
  public void drawVertical(Canvas c, RecyclerView parent) {
    final int left = parent.getPaddingLeft();
    final int right = parent.getWidth() - parent.getPaddingRight();
    final int childCount = parent.getChildCount();
    for (int i = 0; i < childCount; i++) {
      final View child = parent.getChildAt(i);
      RecyclerView v = new RecyclerView(
          parent.getContext());
      final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
          .getLayoutParams();
      final int top = child.getBottom() + params.bottomMargin;
      final int bottom = top + mDivider.getIntrinsicHeight();
      mDivider.setBounds(left, top, right, bottom);
      mDivider.draw(c);
    }
  }
  public void drawHorizontal(Canvas c, RecyclerView parent) {
    final int top = parent.getPaddingTop();
    final int bottom = parent.getHeight() - parent.getPaddingBottom();

    final int childCount = parent.getChildCount();
    for (int i = 0; i < childCount; i++) {
      final View child = parent.getChildAt(i);
      final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
          .getLayoutParams();
      final int left = child.getRight() + params.rightMargin;
      final int right = left + mDivider.getIntrinsicHeight();
      mDivider.setBounds(left, top, right, bottom);
      mDivider.draw(c);
    }
  }
  @Override
  public void getItemOffsets(Rect outRect, int itemPosition,
                RecyclerView parent) {
    if (mOrientation == VERTICAL_LIST) {
      outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
    } else {
      outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
    }
  }
}

4. Implement the ItemTouchHelper. Callback interface:

public class SwipeCallback<T> extends ItemTouchHelper.Callback {

  private RecyclerView.Adapter<? extends RecyclerView.ViewHolder> mAdapter;
  private List<T> mList;

  public SwipeCallback(RecyclerView.Adapter adapter, List<T> list) {
    mAdapter = adapter;
    mList = list;
  }

  @Override
  public boolean isLongPressDragEnabled() {
    return true;
  }

  @Override
  public boolean isItemViewSwipeEnabled() {
    return true;
  }


  @Override
  public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
    int dragFlag=ItemTouchHelper.UP|ItemTouchHelper.DOWN;
    int swipeFlags=ItemTouchHelper.END|ItemTouchHelper.START;

    return makeMovementFlags(dragFlag,swipeFlags);
  }

  // Used for moving item Location of 
  @Override
  public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
    Collections.swap(mList, viewHolder.getAdapterPosition(), target.getAdapterPosition());
    mAdapter.notifyItemMoved(viewHolder.getAdapterPosition(), target.getAdapterPosition());

    return true;
  }

  //1 Used for sliding deletion 
  @Override
  public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
    mList.remove(viewHolder.getAdapterPosition());
    mAdapter.notifyItemRemoved(viewHolder.getAdapterPosition());
  }
}

5. Write sideslip deletion and drag-and-drop Activity

public class SwipeRecyclerViewActivity extends AppCompatActivity {
  private RecyclerView mRecyclerView;

  private List<ImgText> mList;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_swipe_recycler);
    mRecyclerView= (RecyclerView) findViewById(R.id.recycler);
    mList=new ArrayList<>();

    for (int i = 0; i < 20; i++) {
      ImgText it= new ImgText();
      it.resId=R.mipmap.ic_launcher;
      it.des=i+" Sideslip to delete text ";
      mList.add(it);
    }

    final SwipeRecyclerAdapter adapter= new SwipeRecyclerAdapter(mList);
    RecyclerView.LayoutManager manager= new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);
    mRecyclerView.setLayoutManager(manager);
    mRecyclerView.setItemAnimator(new DefaultItemAnimator());
    mRecyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST));
    mRecyclerView.setAdapter(adapter);
    ItemTouchHelper swipeItemHelper= new ItemTouchHelper(new SwipeCallback<>(adapter,mList));
    swipeItemHelper.attachToRecyclerView(mRecyclerView);
  }
}