Swipe View

guest_list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="56dp"
    android:gravity="center_vertical"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/party_size_text_view"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_gravity="center"
        android:background="@drawable/circle"
        android:fontFamily="sans-serif"
        android:gravity="center"
        android:textColor="@android:color/white"
        android:textSize="16sp"
        android:text="@string/default_party_size"/>

    <TextView
        android:id="@+id/name_text_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="16dp"
        android:layout_weight="1"
        android:fontFamily="sans-serif"
        android:textSize="16sp"
        android:text="@string/default_guest_name"/>


</LinearLayout>

GuestListAdapter.java

package com.example.android.waitlist;

import android.content.Context;
import android.database.Cursor;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.example.android.waitlist.data.WaitlistContract;


public class GuestListAdapter extends RecyclerView.Adapter<GuestListAdapter.GuestViewHolder> {

    private Context mContext;
    private Cursor mCursor;
    public GuestListAdapter(Context context, Cursor cursor) {
        this.mContext = context;
        this.mCursor = cursor;
    }

    /**
     * Constructor using the context and the db cursor
     *
     * @param context the calling context/activity
     * @param count
     */
    public GuestListAdapter(Context context, int count) {
        this.mContext = context;
    }

    @Override
    public GuestViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        // Get the RecyclerView item layout
        LayoutInflater inflater = LayoutInflater.from(mContext);
        View view = inflater.inflate(R.layout.guest_list_item, parent, false);
        return new GuestViewHolder(view);
    }

    @Override
    public void onBindViewHolder(GuestViewHolder holder, int position) {

        if (!mCursor.moveToPosition(position))
            return;
        String name = mCursor.getString(mCursor.getColumnIndex(WaitlistContract.WaitlistEntry.COLUMN_GUEST_NAME));
        int partySize = mCursor.getInt(mCursor.getColumnIndex(WaitlistContract.WaitlistEntry.COLUMN_PARTY_SIZE));

        long id = mCursor.getLong(mCursor.getColumnIndex(WaitlistContract.WaitlistEntry._ID));

        holder.nameTextView.setText(name);
        holder.partySizeTextView.setText(String.valueOf(partySize));
        holder.itemView.setTag(id);
    }
    public void swapCursor(Cursor newCursor) {
        // COMPLETED (16) Inside, check if the current cursor is not null, and close it if so
        // Always close the previous mCursor first
        if (mCursor != null) mCursor.close();
        // COMPLETED (17) Update the local mCursor to be equal to  newCursor
        mCursor = newCursor;
        // COMPLETED (18) Check if the newCursor is not null, and call this.notifyDataSetChanged() if so
        if (newCursor != null) {
            // Force the RecyclerView to refresh
            this.notifyDataSetChanged();
        }
    }

    @Override
    public int getItemCount() {
        return mCursor.getCount();
    }




    /**
     * Inner class to hold the views needed to display a single item in the recycler-view
     */
    class GuestViewHolder extends RecyclerView.ViewHolder {

        // Will display the guest name
        TextView nameTextView;
        // Will display the party size number
        TextView partySizeTextView;

        /**
         * Constructor for our ViewHolder. Within this constructor, we get a reference to our
         * TextViews
         *
         * @param itemView The View that you inflated in
         *                 {@link GuestListAdapter#onCreateViewHolder(ViewGroup, int)}
         */
        public GuestViewHolder(View itemView) {
            super(itemView);
            nameTextView = (TextView) itemView.findViewById(R.id.name_text_view);
            partySizeTextView = (TextView) itemView.findViewById(R.id.party_size_text_view);
        }

    }
    
    private boolean removeGuest(long id) {
        // COMPLETED (2) Inside, call mDb.delete to pass in the TABLE_NAME and the condition that WaitlistEntry._ID equals id
        return mDb.delete(WaitlistContract.WaitlistEntry.TABLE_NAME, WaitlistContract.WaitlistEntry._ID + "=" + id, null) > 0;
    }
}

SwipeHelper.java

// COMPLETED (3) Create a new ItemTouchHelper with a SimpleCallback that handles both LEFT and RIGHT swipe directions
        // Create an item touch helper to handle swiping items off the list
        new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {

            // COMPLETED (4) Override onMove and simply return false inside
            @Override
            public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
                //do nothing, we only care about swiping
                return false;
            }

            // COMPLETED (5) Override onSwiped
            @Override
            public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) {
                // COMPLETED (8) Inside, get the viewHolder's itemView's tag and store in a long variable id
                //get the id of the item being swiped
                long id = (long) viewHolder.itemView.getTag();
                // COMPLETED (9) call removeGuest and pass through that id
                //remove from DB
                removeGuest(id);
                // COMPLETED (10) call swapCursor on mAdapter passing in getAllGuests() as the argument
                //update the list
                mAdapter.swapCursor(getAllGuests());
            }

            //COMPLETED (11) attach the ItemTouchHelper to the waitlistRecyclerView
        }).attachToRecyclerView(waitlistRecyclerView);