如果其他用户向您发送消息，我已经创建了一种向其他用户发送通知的方法。我当前遇到的问题是，发送消息的用户就是接收通知的用户。显然，我要其他用户（该通知用于接收该通知的用户）。
因此，我正在模拟器和实际设备上进行测试，当我发送通知时，我会收到通知，然后在与另一台设备一起查看消息时，我会收到另一条通知发送到该设备。
因此，从本质上讲，我收到两个通知，它们都发送到了发送消息的同一设备上。我该如何解决它，以便只有通知的用户才能收到它，而没有人收到，我也不会收到它？
I have been trying to change my if statement, I think that's the key here, but haven't been able to figure it out. Suggestions?
In my sendNotification(); method I have the line if(mFirebaseUser.getUid.equals(receiver)) {...} so shouldn't that make it show up on the device who the notification is for?
MessageActivity
public class MessageActivity extends AppCompatActivity {
TextView mUsername;
TextView mButtonSend;
EditText mTextSend;
FirebaseUser mFirebaseUser;
DatabaseReference mReference;
MessageAdapter mMessageAdapter;
List<Chat> mChat;
RecyclerView mRecyclerView;
String mId;
String mMessageId;
String mUserId;
String NOTIFICATION_CHANNEL_ID = "e.events.Notifications.test";
String NOTIFICATION_CHANNEL_NAME = "Events";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_message);
mId = getIntent().getStringExtra("id");
mFirebaseUser = FirebaseAuth.getInstance().getCurrentUser();
mUserId = getIntent().getStringExtra("userid");
mButtonSend.setOnClickListener(v -> {
String message = mTextSend.getText().toString();
if (!message.equals("")) {
sendMessage(mFirebaseUser.getUid(), mId, message);
sendNotification();
} else {
Toast.makeText(MessageActivity.this, "Write something", Toast.LENGTH_SHORT).show();
}
mTextSend.setText("");
});
getUserInfo();
seenMessage(mId);
}
private void sendNotification() {
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Chats").child(mMessageId);
reference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
String receiver = dataSnapshot.child("receiver").getValue(String.class);
if (mFirebaseUser.getUId().equals(receiver)) {
showNotification();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
private void showNotification() {
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Chats").child(mMessageId);
reference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
String message = dataSnapshot.child("message").getValue(String.class);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, NOTIFICATION_CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.createNotificationChannel(notificationChannel);
NotificationCompat.Builder builder = new NotificationCompat.Builder(MessageActivity.this, NOTIFICATION_CHANNEL_ID)
.setContentTitle("Events")
.setContentText(message)
.setSmallIcon(R.mipmap.ic_launcher)
.setAutoCancel(true);
NotificationManagerCompat notificationManagerCompat = NotificationManagerCompat.from(MessageActivity.this);
notificationManagerCompat.notify(999, builder.build());
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
private void sendMessage(String sender, final String receiver, String message) {
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Chats");
Date date = Calendar.getInstance().getTime();
String formattedDate = DateFormat.getDateInstance(DateFormat.FULL).format(date);
String time = null;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
time = LocalTime.now().format(DateTimeFormatter.ofPattern("HH:mm"));
}
mMessageId = reference.push().getKey();
HashMap<String, Object> hashMap = new HashMap<>();
hashMap.put("sender", sender);
hashMap.put("receiver", receiver);
hashMap.put("message", message);
hashMap.put("isseen", false);
hashMap.put("date", formattedDate);
hashMap.put("time", time);
hashMap.put("timestamp", ServerValue.TIMESTAMP);
hashMap.put("messageId", mMessageId);
reference.child(mMessageId).setValue(hashMap);
final DatabaseReference chatReference = FirebaseDatabase.getInstance().getReference("Chatlist").child(mFirebaseUser.getUid()).child(mId);
chatReference.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (!dataSnapshot.exists()) {
chatReference.child("receiver").setValue(mId);
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
final DatabaseReference chatReferenceReceiver = FirebaseDatabase.getInstance().getReference("Chatlist").child(mId).child(mFirebaseUser.getUid());
chatReferenceReceiver.child("receiver").setValue(mFirebaseUser.getUid());
}
private void readMessages(final String myid, final String userid, final String imageurl) {
mChat = new ArrayList<>();
mReference = FirebaseDatabase.getInstance().getReference("Chats");
mReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
mChat.clear();
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
Chat chat = snapshot.getValue(Chat.class);
if (chat != null) {
if (chat.getReceiver().equals(myid) && chat.getSender().equals(userid) || chat.getReceiver().equals(userid) && chat.getSender().equals(myid)) {
mChat.add(chat);
}
}
mMessageAdapter = new MessageAdapter(MessageActivity.this, mChat, imageurl);
mRecyclerView.setAdapter(mMessageAdapter);
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
