如何让用户在Firebase中拥有自己的聊天室和地图标记?

Question

我做了一个应用程序，可以让用户登录并在谷歌地图上设置标记，并且标记连接到属于设置它的用户的聊天室。

现在的问题是无论我怎么尝试我都无法在聊天活动和 MapFragment 中获取 uid，我不知道有什么问题 以下是三个活动：

有人可以帮帮我吗~~

登录活动：

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
auth = FirebaseAuth.getInstance();
if (auth.getCurrentUser() != null) {
startActivity(new Intent(LoginActivity.this, MainActivity.class));
finish();
}
//authenticate user
auth.signInWithEmailAndPassword(email, password)
.addOnCompleteListener(LoginActivity.this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
// If sign in fails, display a message to the user. If sign in succeeds
// the auth state listener will be notified and logic to handle the
// signed in user can be handled in the listener.
if (!task.isSuccessful()) {
// there was an error
if (password.length() < 6) {
edUserid.setError("密碼太短，請輸入超過6個字元!");
} else {
Toast.makeText(LoginActivity.this, "登入失敗", Toast.LENGTH_LONG).show();
}
} else {
Toast.makeText(getApplicationContext(),"登入成功",Toast.LENGTH_LONG).show();
startActivity(new Intent(LoginActivity.this, MainActivity.class));
finish();
}
}
});


}

聊天活动：

fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
EditText input = (EditText)findViewById(R.id.input);
// Read the input field and push a new instance
// of ChatMessage to the Firebase database
FirebaseDatabase.getInstance()
.getReference(CHAT_PATH)
.push()
.setValue(new ChatMessage(input.getText().toString(),
FirebaseAuth.getInstance()
.getCurrentUser()
.getDisplayName())
);
// Clear the input
input.setText("");
}
});
ListView listOfMessages = (ListView)findViewById(R.id.list_of_messages);
adapter = new FirebaseListAdapter<ChatMessage>(this, ChatMessage.class,
R.layout.message, FirebaseDatabase.getInstance().getReference(CHAT_PATH)) {
@Override
protected void populateView(View v, ChatMessage model, int position) {
// Get references to the views of message.xml
TextView messageText = (TextView)v.findViewById(R.id.message_text);
TextView messageUser = (TextView)v.findViewById(R.id.message_user);
TextView messageTime = (TextView)v.findViewById(R.id.message_time);
// Set their text
messageText.setText(model.getMessageText());
messageUser.setText(model.getMessageUser());
// Format the date before showing it
messageTime.setText(DateFormat.format("dd-MM-yyyy (HH:mm:ss)",
model.getMessageTime()));
}
};
listOfMessages.setAdapter(adapter);
}

}

地图片段(部分(：

mFirebaseDatabase = FirebaseDatabase.getInstance();

mFirebaseRef = mFirebaseDatabase.getReference("Map/"+userUID);
mFirebaseRef.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
LatLng myLatLon = dataSnapshot.getValue(FirebaseMarker.class).toLatLng();
// stash the key in the title, for recall later
Marker myMarker = mgoogleMap.addMarker(new MarkerOptions()
.position(myLatLon).draggable(true).icon(BitmapDescriptorFactory.fromResource(R.drawable.seedloc2)).title(dataSnapshot.getKey()));
// cache the marker locally
markers.put(dataSnapshot.getKey(), myMarker);
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
LatLng myLatLon = dataSnapshot.getValue(FirebaseMarker.class).toLatLng();
// Move markers on the map if changed on Firebase
Marker changedMarker = markers.get(dataSnapshot.getKey());
changedMarker.setPosition(myLatLon);
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
Marker deadMarker = markers.get(dataSnapshot.getKey());
deadMarker.remove();
markers.remove(dataSnapshot.getKey());
Log.v(TAG, "moved !" + dataSnapshot.getValue());

}
@Override
public void onCancelled(DatabaseError databaseError) {
Log.v(TAG, "canceled!" + databaseError.getMessage());
}
});
}
}
@Override
public void onMapReady(final GoogleMap googleMap) {
MapsInitializer.initialize(getContext());
mgoogleMap = googleMap;
googleMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener(){
@Override
public void onInfoWindowClick(Marker marker) {
Intent intent = new Intent(getActivity(),ChatActivity.class);
startActivity(intent);
}
});

Answer 1

你的数据库结构应该是这样的：

• 接触

  • [用户标识]
    • 电子邮件
    • 密码

• 标记

  • [用户标识]
    • 纬度
    • 经度
    • UID

聊天

• [用户标识]
  • [来自推送的键消息]
    • 消息文本
    • 留言时间
    • 消息用户

使用此结构，您可以从标记中获取聊天室ID，并且您也可以使用userId从标记中显示用户信息。

而不是使用来自推送的userId，使用来自 firebase auth 的 uid 会更好。

auth.createUserWithEmailAndPassword(email, password)
.addOnCompleteListener(CreateActivity.this, new 
OnCompleteListener<AuthResult>() {
public void onComplete( Task<AuthResult> task) {
Toast.makeText(CreateActivity.this, "創建成功，請重新登 入", Toast.LENGTH_SHORT).show();
// If sign in fails, display a message to the user. If sign in succeeds
// the auth state listener will be notified and logic to handle the
// signed in user can be handled in the listener.
if (!task.isSuccessful()) {
Toast.makeText(CreateActivity.this, "認證失敗或帳號已 存在" , Toast.LENGTH_SHORT).show();
} else {
// insert user to database
FirebaseDatabase database = FirebaseDatabase.getInstance();
String currentUid = auth.getCurrentUser().getUid();
DatabaseReference myRef = database.getReference("Contacts/" + currentUid);
ContactInfo contact1 = new ContactInfo(email,id,password);
myRef.setValue(contact1);//將會員資料寫入FIREBASE
startActivity(new Intent(CreateActivity.this, MainActivity.class));
finish();
}
}
});

}