Android 从回收器视图和firebase中删除行

我试图从firebase中删除arow，当我在recycler视图中滑动时。我已经成功地从recycler视图中删除了该记录，但正在努力从firebase中删除它。以下是我当前使用的方法，deleteItem（）方法（在getSnapshots（）方法上，无法解析方法“getSnapshots（）”）中的adpater中有一个错误

“我的活动”与“回收者”视图的“物品触摸”帮助器：

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_customer_profile);
 Log.d(TAG, "finding recyclerview");
        recyclerView = (RecyclerView) findViewById(R.id.myRecyclerBooking);
        recyclerView.setLayoutManager( new LinearLayoutManager(this));


        Log.d(TAG, "getting db reference");



        //FirebaseSearch https://www.youtube.com/watch?v=b_tz8kbFUsU
        reference = FirebaseDatabase.getInstance().getReference().child("Booking");
        Query firebaseSearchQuery = reference.orderByChild("customerID").equalTo(mAuth.getCurrentUser().getUid());

        firebaseSearchQuery.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                Log.d(TAG, "populating recyclerview");

                list = new ArrayList<Booking>();
                for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
                    Booking b = dataSnapshot1.getValue(Booking.class);
                    list.add(b);
                }
                adapter = new MyAdapterBookings(CustomerProfile.this, list);
                recyclerView.setAdapter(adapter);
                adapter.notifyDataSetChanged();
            }


            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
                Toast.makeText(CustomerProfile.this, "Opsss.... Something is wrong", Toast.LENGTH_SHORT).show();
            }
        });
}

ItemTouchHelper.SimpleCallback itemTouchHelperCallback = new RecyclerItemTouchHelper(0, ItemTouchHelper.LEFT, this);
        new ItemTouchHelper(itemTouchHelperCallback).attachToRecyclerView(recyclerView);



        ItemTouchHelper.SimpleCallback itemTouchHelperCallback1 = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT | ItemTouchHelper.UP) {
            @Override
            public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
                return false;
            }

            @Override
            public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
                // Row is swiped from recycler view
                // remove it from adapter
            }

            @Override
            public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
                super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
            }
        };

        // attaching the touch helper to recycler view
        new ItemTouchHelper(itemTouchHelperCallback1).attachToRecyclerView(recyclerView);
    }

@Override
    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction, int position) {

        if (viewHolder instanceof MyAdapterBookings.MyViewHolder) {
            // get the removed item name to display it in snack bar
            String name = list.get(viewHolder.getAdapterPosition()).getMuaName();

            // backup of removed item for undo purpose
            final Booking deletedItem = list.get(viewHolder.getAdapterPosition());
            final int deletedIndex = viewHolder.getAdapterPosition();

            // remove the item from recycler view
            adapter.removeItem(viewHolder.getAdapterPosition());
            adapter.deleteItem(viewHolder.getAdapterPosition());


            // showing snack bar with Undo option
            Snackbar snackbar = Snackbar
                    .make(coordinatorLayout, "Appointment with " + name + " cancelled!", Snackbar.LENGTH_LONG);
            snackbar.setAction("UNDO", new View.OnClickListener() {
                @Override
                public void onClick(View view) {

                    // undo is selected, restore the deleted item
                    adapter.restoreItem(deletedItem, deletedIndex);
                }
            });
            snackbar.setActionTextColor(Color.YELLOW);
            snackbar.show();
        }

    }

创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u customer\u profile）；
Log.d（标签“查找回收视图”）；
recyclerView=（recyclerView）findViewById（R.id.myRecyclerBooking）；
recyclerView.setLayoutManager（新的LinearLayoutManager（本））；
Log.d（标记“获取数据库引用”）；
//火基搜索https://www.youtube.com/watch?v=b_tz8kbFUsU
reference=FirebaseDatabase.getInstance（）.getReference（）.child（“预订”）；
Query firebaseSearchQuery=reference.orderByChild（“customerID”）.equalTo（mAuth.getCurrentUser（）.getUid（））；
firebaseSearchQuery.addValueEventListener（新的ValueEventListener（）{
@凌驾
public void onDataChange（@NonNull DataSnapshot DataSnapshot）{
Log.d（标记“填充回收视图”）；
列表=新的ArrayList（）；
对于（DataSnapshot dataSnapshot1:DataSnapshot.getChildren（））{
Booking b=dataSnapshot1.getValue（Booking.class）；
列表.添加（b）；
}
adapter=新的MyAdapterBookings（CustomerProfile.this，list）；
recyclerView.setAdapter（适配器）；
adapter.notifyDataSetChanged（）；
}
@凌驾
已取消的公共void（@NonNull DatabaseError DatabaseError）{
Toast.makeText（CustomerProfile.this，“Opsss…有问题”，Toast.LENGTH\u SHORT.show（）；
}
});
}
ItemTouchHelper.SimpleCallback itemTouchHelperCallback=新的RecyclerItemTouchHelper（0，ItemTouchHelper.LEFT，此）；
新建ItemTouchHelper（itemTouchHelperCallback）.attachToRecyclerView（recyclerView）；
ItemTouchHelper.SimpleCallback itemTouchHelperCallback1=新建ItemTouchHelper.SimpleCallback（0，ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT | ItemTouchHelper.UP）{
@凌驾
公共布尔onMove（RecyclerView RecyclerView、RecyclerView.ViewHolder ViewHolder、RecyclerView.ViewHolder目标）{
返回false；
}
@凌驾
公共空间（RecyclerView.ViewHolder ViewHolder，int方向）{
//行从回收器视图中刷取
//将其从适配器上卸下
}
@凌驾
public void onChildraw（画布c、RecyclerView RecyclerView、RecyclerView.ViewHolder ViewHolder、float dX、float dY、int actionState、boolean isCurrentlyActive）{
super.onchildraw（c、recyclerView、viewHolder、dX、dY、actionState、isCurrentlyActive）；
}
};
//将触摸辅助对象附加到回收器视图
新建ItemTouchHelper（itemTouchHelperCallback1）.attachToRecyclerView（recyclerView）；
}
@凌驾
公共空间（RecyclerView.ViewHolder ViewHolder、int方向、int位置）{
if（MyAdapterBookings.MyViewHolder的viewHolder实例）{
//获取删除的项目名称以在快餐店中显示
String name=list.get（viewHolder.getAdapterPosition（））.getMuaName（）；
//为撤消目的备份已删除的项目
final Booking deletedItem=list.get（viewHolder.getAdapterPosition（））；
final int deletedIndex=viewHolder.getAdapterPosition（）；
//从回收器视图中删除项目
adapter.removietem（viewHolder.getAdapterPosition（））；
deleteItem（viewHolder.getAdapterPosition（））；
//显示具有撤消选项的快餐店
Snackbar Snackbar=Snackbar
.make（coordinatorLayout，“+姓名+”取消的约会！”，Snackbar.LENGTH_LONG）；
snackbar.setAction（“UNDO”，new View.OnClickListener（））{
@凌驾
公共void onClick（视图）{
//如果选择“撤消”，则恢复已删除的项目
adapter.restoreItem（deletedItem，deletedIndex）；
}
});
snackbar.setActionTextColor（Color.YELLOW）；
snackbar.show（）；
}
}

我的适配器：

import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;
import com.google.firebase.database.ValueEventListener;
import com.squareup.picasso.Picasso;

import java.util.ArrayList;

public class MyAdapterBookings extends RecyclerView.Adapter<MyAdapterBookings.MyViewHolder> {

    Context context;
    ArrayList<Booking> bookings;
    DatabaseReference reference;
    private static final String TAG = "Bookings Adapter";
    public MyAdapterBookings(Context c , ArrayList<Booking> b)
    {
        context = c;
        bookings = b;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new MyViewHolder(LayoutInflater.from(context).inflate(R.layout.bookingview,parent,false));
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        holder.name.setText(bookings.get(position).getMuaName());
        holder.date.setText(bookings.get(position).getDate());
        holder.time.setText(bookings.get(position).getTime());
        holder.price.setText(bookings.get(position).getPrice());
        holder.location.setText(bookings.get(position).getLocation());

    }

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

    class MyViewHolder extends RecyclerView.ViewHolder
    {
        TextView name,date,time,price,location;
        public RelativeLayout viewBackground, viewForeground;
        public MyViewHolder(View itemView) {
            super(itemView);
            name = (TextView) itemView.findViewById(R.id.name);
            date = (TextView) itemView.findViewById(R.id.date);
            time = (TextView) itemView.findViewById(R.id.time);
            price = (TextView) itemView.findViewById(R.id.price);
            location = (TextView) itemView.findViewById(R.id.location);

            viewBackground = itemView.findViewById(R.id.view_background);
            viewForeground = itemView.findViewById(R.id.view_foreground);



        }    }



    public void removeItem(int position) {
        bookings.remove(position);
        // notify the item removed by position
        // to perform recycler view delete animations
        // NOTE: don't call notifyDataSetChanged()
        notifyItemRemoved(position);


}


public void deleteItem(int position){

    getSnapshots().getSnapshot(position).getReference().delete();
}

public void restoreItem(Booking item, int position) {
        bookings.add(position, item);
        // notify item added by position
        notifyItemInserted(position);
    }



}

导入android.content.Context；
导入android.content.Intent；
导入android.os.Handler；
导入android.support.annotation.NonNull；
导入android.support.v7.widget.RecyclerView；
导入android.util.Log；
导入android.view.LayoutInflater；
导入android.view.view；
导入android.view.ViewGroup；
导入android.widget.Button；
导入android.widget.ImageView；
导入android.widget.RelativeLayout；
导入android.widget.TextView；
导入android.widget.Toast；
导入com.google.android.gms.tasks.OnCompleteListener；
导入com.google.android.gms.tasks.Task；
导入com.google.firebase.database.DataSnapshot；
导入com.google.firebase.database.DatabaseError；
导入com.google.firebase.database.DatabaseReference；
导入com.google.firebase.database.FirebaseDatabase；
导入com.google.firebase.database.Query；
导入com.google.firebase.database.ValueEventListener；
导入com.squareup.picasso.picasso；
导入java.util.ArrayList；
公共类MyAdapterBookings扩展了RecyclerView.Adapter{
语境；
ArrayList预订；
数据库参考；
私有静态最终字符串标记=“预订适配器”；
公共MyAdapterBookings（上下文c，数组列表b）
{
上下文=c；
预订=b；
}
@非空
@凌驾
public MyViewHolder onCreateViewHolder（@NonNull ViewGroup父级，int v
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
    for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
        //Booking b = dataSnapshot1.getValue(Booking.class);
        dataSnapshot1.getRef().removeValue();
    }
}

ArrayList<Booking> bookings;
ArrayList<String> keys;

public MyAdapterBookings(Context c , ArrayList<Booking> b, ArrayList<String> k)
{
    context = c;
    bookings = b;
    keys = k;
}

public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
    Log.d(TAG, "populating recyclerview");

    list = new ArrayList<Booking>();
    List<String> keys = new ArrayList<String>();
    for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
        Booking b = dataSnapshot1.getValue(Booking.class);
        list.add(b);
        keys.add(dataSnapshot1.getKey());
    }
    adapter = new MyAdapterBookings(CustomerProfile.this, list, keys);
    recyclerView.setAdapter(adapter);
    adapter.notifyDataSetChanged();
}

public void deleteItem(int position){
    String key = keys.get(position);
    DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("Booking");
    ref.child(key).removeValue();
}