title: get key position in onBindViewHolder firebase database
body: <p>I want to get key position in database.</p>
  
  <p>getting error: <code>getRef(position) : Cannot resolve method 'getRef(int)'</code> on</p>
  
  <pre><code>final String post_key = getRef(position).getKey();
  </code></pre>
  
  <p>this is my code CustomPostAdapter</p>
  
  <pre><code>public class CustomPostAdapter extends RecyclerView.Adapter&lt;CustomPostAdapter.ViewHolder&gt;{
      public List&lt;Spacecraft&gt; userList ;
      public Context context ;
  
      private boolean mProcessLike = false ;
      private DatabaseReference mDatabaseLike ;
  
    //  public ImageView imagePostt ;
  
      public CustomPostAdapter(Context context , List&lt;Spacecraft&gt; userList){
          this.userList = userList ;
          this.context = context;
      }
  
      @NonNull
      @Override
      public CustomPostAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
          View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_posts_item, parent,false);
          return new CustomPostAdapter.ViewHolder(view);
      }
  
      @Override
      public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {
  
  
          mDatabaseLike = FirebaseDatabase.getInstance().getReference().child("Likes");
          mDatabaseLike.keepSynced(true);
  
  
          final String post_key = getRef(position).getKey();
  
          final String name =  userList.get(position).getName();
          final String image_post = userList.get(position).getImage_post();
          final String descrip = userList.get(position).getDescrip();
          final String hachatg = userList.get(position).getHachtag();
          final String user = userList.get(position).getUser();
          final String time = userList.get(position).getTime();
  
          //Text Post
          holder.nameText.setText(name);
          holder.descripText.setText(descrip);
          holder.hachtagText.setText(" " + hachatg);
          holder.timeText.setText(" " + time);
  
  
          //Imgae Post if null set Visibtly Gone to ImageView
          if (TextUtils.isEmpty(image_post)){
              holder.imagePostt.setVisibility(View.GONE);
  
          }else {
              //Image Post
              Picasso.with(context).load(image_post).into(holder.imagePostt , new Callback() {
                  @Override
                  public void onSuccess() {
                      holder.imagePostt.setVisibility(View.VISIBLE);
                  }
                  @Override
                  public void onError() {
                      holder.imagePostt.setVisibility(View.GONE);
                  }
              });
          }
  
          //Onclick items
          holder.mView.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  Intent intent = new Intent(context , ContentActivity.class);
                  intent.putExtra("NAME_KEY", name);
                  intent.putExtra("HACHTAG_KEY", hachatg);
                  intent.putExtra("DESCRIP_KEY", descrip);
                  intent.putExtra("USER_KEY", user);
                  intent.putExtra("IMAGE_POST", image_post);
  
  
                  intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                  context.startActivity(intent);
              }
          });
  
          //Button Like Onclice
          holder.mLikeBtn.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
  
                  mProcessLike = true;
  
                  if (mProcessLike){
                      mDatabaseLike.addValueEventListener(new ValueEventListener() {
                          @Override
                          public void onDataChange(DataSnapshot dataSnapshot) {
  
  
                              //Chek if user already Like or not
                              if (dataSnapshot.child(post_key).hasChild(user)){
  
  
  
                              }else {
  
                                  mDatabaseLike.child(post_key).child(user).setValue("RandomValue");
                                  mProcessLike = false;
                              }
  
                          }
  
                          @Override
                          public void onCancelled(DatabaseError databaseError) {
  
                          }
                      });
                  }
  
  
              }
          });
  
  
  
      }
  
      @Override
      public int getItemCount() {
          return userList.size();
      }
  
  
      public class ViewHolder extends RecyclerView.ViewHolder {
  
          View mView;
  
          public TextView nameText , hachtagText , descripText, urlText , timeText;
          public ImageView imagePostt ;
          public ImageButton mLikeBtn ;
  
  
          public ViewHolder(View itemView) {
              super(itemView);
              mView = itemView;
  
  
              nameText = (TextView)mView.findViewById(R.id.text_nameProblem);
              hachtagText = (TextView)mView.findViewById(R.id.text_nameUser);
            //  urlText = (TextView)mView.findViewById(R.id.textUrl);
              descripText = (TextView)mView.findViewById(R.id.text_Discription);
              timeText = (TextView)mView.findViewById(R.id.timeText);
              imagePostt = (ImageView)mView.findViewById(R.id.imagePost);
              mLikeBtn = (ImageButton)mView.findViewById(R.id.btnLike);
  
  
  
  
          }
      }
  }
  </code></pre>