Firebase数据未添加到正确的子级

Question

我的问题如上所述，我添加的数据没有存储在正确的孩子身上。如果数据存储在错误的孩子身上，这意味着检查孩子是否存在的部分将不会发生。

EditText editTextName;
EditText textDate;
EditText textTime;
Spinner spinnerSport;
ListView listViewTeams;
DatePickerDialog datePickerDialog;

//a list to store all the team from firebase database
List<Team> teams;
List<Member> members;

//our database reference object
DatabaseReference databaseTeams;
DatabaseReference databaseMembers;

databaseTeams = FirebaseDatabase.getInstance().getReference("teams");
    databaseMembers = FirebaseDatabase.getInstance().getReference("members");


    //getting views
    editTextName = (EditText) findViewById(R.id.editTextName);
    spinnerSport = (Spinner) findViewById(R.id.spinnerSports);
    listViewTeams = (ListView) findViewById(R.id.listViewTeams);
    textDate = (EditText) findViewById(R.id.textDate);
    textTime = (EditText) findViewById(R.id.textTime);

    //list to store teams
    teams = new ArrayList<>();



    //attaching listener to listview
    listViewTeams.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            //getting the selected team
            Team team = teams.get(i);
            checkMember();


            //creating an intent
            Intent intent = new Intent(getApplicationContext(), ChatRoomActivity.class);

            //putting team name and id to intent
            intent.putExtra(TEAM_ID, team.getTeamId());
            intent.putExtra(TEAM_NAME, team.getTeamName());

            //starting the activity with intent
            startActivity(intent);
        }
    });

@Override
protected void onStart() {
    super.onStart();
    //attaching value event listener
    databaseTeams.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

            //clearing the previous team list
            teams.clear();

            //iterating through all the nodes
            for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
                //getting team
                Team team = postSnapshot.getValue(Team.class);
                //adding team to the list
                teams.add(team);
            }

            //creating adapter
            TeamList teamAdapter = new TeamList(MainActivity.this, teams);
            //attaching adapter to the listview
            listViewTeams.setAdapter(teamAdapter);
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
}

private void checkMember(){
    FirebaseUser user = firebaseAuth.getCurrentUser();

    final String teamMember = user.getEmail();
    final String encodedEmailAddress = encodeUserEmail(teamMember);
    databaseMembers.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            if(dataSnapshot.hasChild(encodedEmailAddress)){
                finish();
            }
            else{
                databaseMembers.push().setValue(encodedEmailAddress);
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
}

该电子邮件已添加到“成员”中，但我希望将其添加到用户在列表视图中单击的团队名称中，以便将电子邮件存储到其中，例如说“heng”。任何帮助表示赞赏。如果缺少信息，请告诉我。

编辑2： 这是我目前的checkMember，

private void checkMember(final String teamName){
    FirebaseUser user = firebaseAuth.getCurrentUser();
    final Member memberObject = new Member();

    final String teamMember = user.getEmail();
    final String encodedEmailAddress = encodeUserEmail(teamMember);
    databaseMembers.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            if(!dataSnapshot.child("members").child(teamName).hasChild("teamMember")){
Team team = dataSnapshot.getValue(Team.class);
                memberObject.setTeamMember("teamMember");
            Map<String,Object> map = new HashMap<>();

            map.put(Team.getTeamName(),memberObject);
              databaseMembers.child(teamName).updateChildren(map);
  databaseMembers.child(teamName).child("teamMember").setValue(encodedEmailAddress);

            }
            else{

            }
        }

Member.java

public class Member {
private String teamMember;


public Member(){

}

public Member(String teamMember){
    this.teamMember = teamMember;
}

public String getTeamMember() {return teamMember;}
public String setTeamMember(String teamMember) {return this.teamMember;}
}

Team.java

public class Team {
private String teamId;
private String teamName;
private String teamSport;
private String teamOwner;
private String date;
private String time;

public Team() {

}

public Team(String teamId, String teamName, String teamSport, String teamOwner, String date, String time) {
    this.teamId = teamId;
    this.teamName = teamName;
    this.teamSport = teamSport;
    this.teamOwner = teamOwner;
    this.date = date;
    this.time = time;
}

public String getTeamId() {return teamId;}

public String getTeamName() {
    return teamName;
}

public String getTeamSport() {
    return teamSport;
}

public String getTeamOwner() { return  teamOwner; }

public String getDate(){ return date; }

public String getTime() { return time; }

}

Answer 1

为了做到这一点，您需要从点击的ListView项中获取团队名称。拥有team name，您就可以在新的DatabaseReference中使用它，以便在您想要的确切位置添加电子邮件地址。因此，假设您有一个活动，您可以使用ListView使用FirebaseListAdapter数据库中的所有团队来显示Teams。此部分名为 ListView listView = (ListView) findViewById(R.id.list_view); DatabaseReference ref = databaseMembers.child("Teams"); FirebaseListAdapter firebaseListAdapter = new FirebaseListAdapter<String>(YourActivity.this, String.class, R.layout.list) { @Override protected void populateView(final View v, final String teamName, int position) { ((TextView )v.findViewById(R.id.team_name)).setText(teamName); } }; listView.setAdapter(firebaseListAdapter); 。

adapter

设置setOnItemClickListener后，我们需要 listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) { String teamName = (String) adapterView.getItemAtPosition(position); Intent intent = new Intent(getApplicationContext(), YourNewActivity.class); intent.putExtra("teamName", teamName); startActivity(intent); } }); 查看列表中的哪个元素，用户点击了该元素。我们将元素存储在intent中，之后我们将能够在第二个活动中使用它。

teamName

最后，要从第二个活动中获取String teamName = (String) getIntent().getExtras().get("teamName");，我们将使用此代码： <Router history={browserHistory}> <Route path="/" component={Root}> <IndexRoute component={App} /> <Route path="/sna/:country" component={SNA} /> <Route path="*" component={FourOFour}/> </Route> </Router>

希望它有所帮助。

Answer 2

不要使用push（）它总是在firebase中创建一个新的子键，试试这个并让我知道这是否有效

databaseMembers.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            if(!dataSnapshot.child("members").child("your groupname").hasChild("teamMember")){//do your check for here
                databaseMembers.child("members").child("your groupname").child("teamMember").setValue(encodedEmailAddress);
            }
            else{
                finish();
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

更新1：

private void checkMember(String teamName){
    FirebaseUser user = firebaseAuth.getCurrentUser();
    final String teamMember = user.getEmail();
    final String encodedEmailAddress = encodeUserEmail(teamMember);
    databaseMembers.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            if(!dataSnapshot.child("members").child(teamName).hasChild("teamMember")){//do your check for here
                    databaseMembers.child("members").child(teamName).child("teamMember").setValue(encodedEmailAddress);
                }
                else{
                    finish();
                }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

//attaching listener to listview
    listViewTeams.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            //getting the selected team
            Team team = teams.get(i);
            checkMember(team.getTeamName());//pass your team name here


            //creating an intent
            Intent intent = new Intent(getApplicationContext(), ChatRoomActivity.class);

            //putting team name and id to intent
            intent.putExtra(TEAM_ID, team.getTeamId());
            intent.putExtra(TEAM_NAME, team.getTeamName());

            //starting the activity with intent
            startActivity(intent);
        }
    });

<强> UPDATE2：

替换现有的孩子

Member memberObject = new Member();   
memberObject.setTeamMember("your email here");//edit your object

 Map<String,Object> map = new HashMap<>();
        map.put(team.getTeamName(),memberObject);
        firebaseDatabase.getReference().databaseMembers.child("members").child(teamName).updateChildren(map);