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[英]The UID's in Firebase Authentication and Firebase Realtime Database are different
[英]Retrieving Uid's from Firebase Database
我目前正在開發一個聊天應用程序。 我的目標是在單擊該用戶名時獲取特定的 id(在圖片中標記)並將其顯示在 logcat 中。
這是回收器視圖的 ViewHolder 類和適配器類。
public class UsersAdapterClass extends RecyclerView.Adapter<UsersAdapterClass.UsersViewHolder>{
Context context;
List<Users> usersList;
FirebaseDatabase firebaseDatabase;
DatabaseReference db;
public UsersAdapterClass(Context context, List<Users> usersList) {
this.context = context;
this.usersList = usersList;
}
@Override
public UsersViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.users_single_layout,parent,false);
UsersViewHolder usersViewHolder = new UsersViewHolder(view);
return usersViewHolder;
}
@Override
public void onBindViewHolder(UsersViewHolder holder, int position) {
Users users = usersList.get(position);
holder.name.setText(users.getName());
holder.status.setText(users.getStatus());
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
firebaseDatabase= FirebaseDatabase.getInstance();
db = firebaseDatabase.getInstance().getReference("Users");
final String firebaseId2 = db.push().getKey();
Log.d("User ID",firebaseId2);
}
});
}
@Override
public int getItemCount() {
return usersList.size();
}
public class UsersViewHolder extends RecyclerView.ViewHolder{
CircleImageView image;
TextView name,status;
public UsersViewHolder(View itemView) {
super(itemView);
image = itemView.findViewById(R.id.circleImageView);
name = itemView.findViewById(R.id.users_displayname);
status = itemView.findViewById(R.id.users_status);
}
public CircleImageView getImage() {
return image;
}
}
}
這也是保存回收器視圖的類的代碼。
public class UsersMainActivity extends AppCompatActivity {
private Toolbar mToolbar;
RecyclerView mRecyclerView;
UsersAdapterClass adapter;
private DatabaseReference mUserDatabase;
List<Users> usersList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_users_main);
mToolbar = findViewById(R.id.allusers_appbar);
mRecyclerView = findViewById(R.id.allusers_recyclerView);
setSupportActionBar(mToolbar);
getSupportActionBar().setTitle("All users");
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mUserDatabase = FirebaseDatabase.getInstance().getReference().child("Users");
usersList = new ArrayList<>();
DatabaseReference dbUsers = FirebaseDatabase.getInstance().getReference("Users");
dbUsers.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if(dataSnapshot.exists())
{
for(DataSnapshot userSnapshot:dataSnapshot.getChildren())
{
Users u = userSnapshot.getValue(Users.class);
usersList.add(u);
}
adapter = new UsersAdapterClass(UsersMainActivity.this,usersList);
mRecyclerView.setAdapter(adapter);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
根據數據庫的結構,當您循環接收到的快照時,用戶 ID 將成為關鍵。 要獲取密鑰,只需在循環數據快照上調用getKey()
即可。 您可以通過在循環之間添加以下代碼並將其記錄到您的 Logcat 來做到這一點...
String userIds = userSnapshot.getKey(); //Get keys
Log.d("USERID KEYS", userIds) //Log to logcat
編輯:在您的User
模型/POJO 中為用戶 ID 創建一個getter和setter 。 然后將userIds
傳遞給 setter。 例如u.setUserId(userIds)
。 現在在您的適配器中,只需在您的onclick()
中獲取userid
...
@Override
public void onClick(View v) {
Log.d("User ID",user.getUserId());
}
...
在您的 onBindViewHolder 中,您可以通過這種方式將 uid 存儲在字符串中
final String userIds = getRef(position).getKey();
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