[英]Recycler view adapter now displaying data in fragment
我試圖通過回收站視圖在我的片段中顯示我的數據庫中的數據。 我使用 for 循環遍歷數據庫中的所有用戶。 所有既不是朋友也沒有發送請求的用戶應該在fragment類的if
條件中顯示為已實現。 片段類的代碼寫在下面。
public class AddMemberFragment extends Fragment {
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private View view ;
FirebaseUser firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
DatabaseReference mRootRef = FirebaseDatabase.getInstance().getReference();
String userId;
String n_team ;
ArrayList<Friend> friends;
public AddMemberFragment() {
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.addnewfriend_fragment, container, false);
return view;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
userId = firebaseUser.getUid();
ManageTeamTabbedActivity activity = (ManageTeamTabbedActivity) getActivity();
n_team = activity.getMyData();
mRecyclerView = (RecyclerView) getView().findViewById(R.id.addNewFriend);
//mRecyclerView.setHasFixedSize(true);//
mLayoutManager = new LinearLayoutManager(getActivity());
mRecyclerView.setLayoutManager(mLayoutManager);
friends = new ArrayList<>();
mAdapter = new AddMemberAdapter(getActivity(), friends, n_team) ;
mRecyclerView.setAdapter(mAdapter);
mRootRef.child("users");
mRootRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
ArrayList<Friend> friendArrayList = new ArrayList<>();
DataSnapshot friendsData = dataSnapshot.child(firebaseUser.getUid()).child("friends");
DataSnapshot requests = null;
DataSnapshot currentFriends = null;
if (friendsData.hasChild("requests")) {
requests = dataSnapshot.child(firebaseUser.getUid()).child("friends").child("requests");
}
if (friendsData.hasChild("currentFriends")) {
currentFriends = dataSnapshot.child(firebaseUser.getUid()).child("friends").child("currentFriends");
}
for (DataSnapshot userSnapshot : dataSnapshot.getChildren()) {
Log.d("demo", "USERID " + FirebaseAuth.getInstance().getCurrentUser().getUid());
Friend friend = new Friend();
if ((userSnapshot.getKey().equals(FirebaseAuth.getInstance().getCurrentUser().getUid())) || (requests != null && requests.hasChild(userSnapshot.getKey()))
|| (currentFriends != null && currentFriends.hasChild(userSnapshot.getKey()))) {
} else {
friend.setId(userSnapshot.getKey());
friend.setFriendName((String) userSnapshot.child("profiles").child("fname").getValue());
friendArrayList.add(friend);
}
}
friends = friendArrayList;
if (friends != null && !friends.isEmpty()) {
mAdapter.setFriendList(friends);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
對應的適配器代碼寫在這里:
public class AddMemberAdapter extends RecyclerView.Adapter<AddMemberAdapter.RecyclerViewHolder>{
private ArrayList<Friend> mData;
private Context mContext;
private FirebaseAuth auth;
private String u_team ;
public AddMemberAdapter(Context mContext, ArrayList<Friend> friendList , String u_team) {
this.mData = friendList;
this.mContext = mContext;
this.u_team= u_team;
}
@Override
public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.addnewfriend_layout, parent, false);
AddMemberAdapter.RecyclerViewHolder viewHolder = new AddMemberAdapter.RecyclerViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(RecyclerViewHolder holder, final int position) {
final Friend frnd =(Friend) mData.get(position);
holder.friendName.setText(frnd.getFriendName());
holder.addFriend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
frnd.setStatus("sent");
final DatabaseReference mRootRef = FirebaseDatabase.getInstance().getReference();
final FirebaseUser firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
final String UID = firebaseUser.getUid();
mRootRef.child("users").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
mRootRef.child("users").child(UID).child("friends").child("requests").child(frnd.getId()).setValue(frnd);
Friend temp = new Friend();
temp.setId(firebaseUser.getUid());
temp.setFriendName(firebaseUser.getDisplayName());
temp.setStatus("received");
mRootRef.child("users").child(frnd.getId()).child("friends").child("requests").child(firebaseUser.getUid()).setValue(temp);
mData.remove(frnd);
notifyDataSetChanged();
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
});
}
@Override
public int getItemCount() {
return mData.size();
}
public class RecyclerViewHolder extends RecyclerView.ViewHolder {
TextView friendName;
ImageButton addFriend;
public RecyclerViewHolder(View itemView) {
super(itemView);
friendName = (TextView)itemView.findViewById(R.id.textViewFriendName);
addFriend = (ImageButton) itemView.findViewById(R.id.imagebuttonFriendAdd);
}
}
public void setFriendList(ArrayList<Friend> friendList){
this.mData = friendList;
notifyDataSetChanged();
}
}
我得到的輸出附在這里。
不是好友且未收到當前用戶發送好友請求的用戶應該已通過此RecyclerView
顯示在此 Add New Member 片段中。 我試圖自己調試它並刪除 if 條件,但它也不起作用。 請指導如何顯示它。 這
還附上了數據庫截圖。
我找不到您的 firebase 查詢和數據提取技術的問題,但是,使用這種數據結構,隨着列表的增長,您將很難獲得朋友的列表。 根據我的理解,顯示該片段中的列表需要花費大量時間。
此外,您還可以考慮設立適配器與RecyclerView
,而你是初始化RecyclerView
。
您可能會考慮執行以下操作。
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
userId = firebaseUser.getUid();
ManageTeamTabbedActivity activity = (ManageTeamTabbedActivity) getActivity();
n_team = activity.getMyData();
mRecyclerView = (RecyclerView) getView().findViewById(R.id.addNewFriend);
// mRecyclerView.setHasFixedSize(true); // Remove this line
mLayoutManager = new LinearLayoutManager(getActivity());
mRecyclerView.setLayoutManager(mLayoutManager);
// Set the adapter here with an empty list first.
friends = new ArrayList<>();
mAdapter = new AddMemberAdapter(getActivity(), friends, n_team);
mRecyclerView.setAdapter(mAdapter);
mRootRef.child("users");
mRootRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
ArrayList<Friend> friendArrayList = new ArrayList<>();
DataSnapshot friendsData = dataSnapshot.child(firebaseUser.getUid()).child("friends");
DataSnapshot requests = null;
DataSnapshot currentFriends = null;
if (friendsData.hasChild("requests")) {
requests = dataSnapshot.child(firebaseUser.getUid()).child("friends").child("requests");
}
if (friendsData.hasChild("currentFriends")) {
currentFriends = dataSnapshot.child(firebaseUser.getUid()).child("friends").child("currentFriends");
}
for (DataSnapshot userSnapshot : dataSnapshot.getChildren()) {
Log.d("demo", "USERID " + FirebaseAuth.getInstance().getCurrentUser().getUid());
Friend friend = new Friend();
if ((userSnapshot.getKey().equals(FirebaseAuth.getInstance().getCurrentUser().getUid())) || (requests != null && requests.hasChild(userSnapshot.getKey()))
|| (currentFriends != null && currentFriends.hasChild(userSnapshot.getKey()))) {
} else {
friend.setId(userSnapshot.getKey());
friend.setFriendName((String) userSnapshot.child("profiles").child("fname").getValue());
friendArrayList.add(friend);
}
}
friends = friendArrayList;
if (friends != null && !friends.isEmpty()) {
mAdapter.setFriendList(friends); // Set the friend list to the adapter when the list is loaded.
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
在您的適配器中,您將需要一個函數來設置好友列表並調用notifyDataSetChanged()
。
// In your adapter class, add the following method.
public void setFriendList(ArrayList<Friend> friendList) {
this.mData = friendList;
notifyDataSetChanged();
}
我希望這有幫助。
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