Question

我正在使用Firebase作为其后端制作Android Chat应用程序。我在布局中使用了RecyclerView，显示了目前正在使用聊天应用程序的用户。为了填充RecyclerView，我正在使用FirebaseRecyclerAdapter对象。

我想要做的是，在RecyclerView中显示附近的用户。所以我得到他们的位置并计算到我当前位置的距离。

我想停止将远离我所在位置的用户添加到RecyclerView。虽然仍然使用recyclerView显示空白空间，但我已经设置了setVisibility（View.GONE）。我该如何解决这个问题

代码：

private void friendsLoad() {
    friendsAdapter = new FirebaseRecyclerAdapter<UserDetailsClass, FriendsViewHolder>(
            UserDetailsClass.class,
            R.layout.friend_online,
            FriendsViewHolder.class,
            tempUserRef
    ) {
        @Override
        protected void populateViewHolder(final FriendsViewHolder viewHolder, UserDetailsClass model, int position) {

            if (model.getUserID().equals(UserDetails.getString("UniqueID", "ID"))) {
                sender = model.getName();
                viewHolder.mView.setVisibility(View.GONE);
                viewHolder.mView.setY(0);
                viewHolder.mView.setWillNotDraw(false);
            }
            if (!model.getUserID().equals(UserDetails.getString("UniqueID", "ID"))) {

                // Calculate Distance
                distanceCalculator = new DistanceCalculator(latitude, longitude);
                distanceCalculator.calculate(model.getLatitude(), model.getLongitude());

                double distance = distanceCalculator.getDistanceInMeters();

                if (distance >= 8000) {
                    viewHolder.mView.setVisibility(View.GONE);
                }

                if (distance >= 4000 && distance < 8000) {
                    Log.i("Distance", "More than 4 Km");
                    viewHolder.friendName.setText(model.getName());
                    viewHolder.stateName.setText("");
                    viewHolder.distance.setText("Not Near By");
                    viewHolder.distance.setTextColor(Color.RED);
                }
                if (2000 <= distance && distance < 4000) {
                    Log.i("Distance", "More less 4 Km and more than 2Km");
                    viewHolder.friendName.setText(model.getName());
                    viewHolder.stateName.setText(model.getStateName());
                    viewHolder.distance.setText("Approachable");
                    viewHolder.distance.setTextColor(getResources().getColor(R.color.skyBlue));

                }
                if (distance < 2000) {
                    Log.i("Distance", "less than 1 Km");
                    viewHolder.friendName.setText(model.getName());
                    viewHolder.stateName.setText(model.getStateName()); // Setting up the City name
                    viewHolder.distance.setText("Near By");
                    viewHolder.distance.setTextColor(getResources().getColor(R.color.commandoGreen));
                }

                //End of calculating distance

                if (model.getOnline_offline_status() == 1) {
                    viewHolder.online.setText("Online");
                    viewHolder.online.setTextColor(getResources().getColor(R.color.darkGreen));
                }
                if (model.getOnline_offline_status() == 0) {
                    viewHolder.online.setText("");
                }

            }


            viewHolder.mView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    //Log.i("TAG", "Clicked");
                    Intent intent = new Intent(ChatHomeActivity.this, NewMessageList.class);
                    intent.putExtra("Sender", sender);
                    intent.putExtra("Receiver", viewHolder.friendName.getText().toString());
                    startActivity(intent);
                }
            });
        }
    };

    recyclerView.setLayoutManager(mLinearLayoutManager);
    recyclerView.setAdapter(friendsAdapter);
}

如何隐藏不应在RecyclerView中显示的RecyclerView项目？

0 个答案: