我有一个聊天应用程序的方法,一切似乎运行没有错误,但每次我尝试键入的东西都没有弹出。
当用户登录时,onActivityResult
会显示成功消息:
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == SIGN_IN_REQUEST_CODE) {
if (resultCode == RESULT_OK) {
Snackbar.make(activity_main, "Success. Welcome.", Snackbar.LENGTH_SHORT).show();
}
else {
Snackbar.make(activity_main, "Error", Snackbar.LENGTH_SHORT).show();
finish();
}
}
}
但是,它没有显示我的onCreate
欢迎信息后:
if(FirebaseAuth.getInstance().getCurrentUser() == null) {
startActivityForResult(AuthUI.getInstance().createSignInIntentBuilder().build(), SIGN_IN_REQUEST_CODE);
}
else {
Snackbar.make(activity_main, "Welcome " + FirebaseAuth.getInstance().getCurrentUser().getEmail(), Snackbar.LENGTH_SHORT);
//Load content
displayChat();
}
键入消息时,也不显示任何消息。我错误地查询了吗?
private void displayChat() {
ListView listOfMessage = findViewById(R.id.list_of_message);
Query query = FirebaseDatabase.getInstance().getReference();
FirebaseListOptions<Chat> options = new FirebaseListOptions.Builder<Chat>()
.setLayout(R.layout.list_item)
.setQuery(query, Chat.class)
.build();
adapter = new FirebaseListAdapter<Chat>(options) {
@Override
protected void populateView(View v, Chat model, int position) {
//Get reference to the views of list_item.xml
TextView messageText, messageUser, messageTime;
messageText = v.findViewById(R.id.message_text);
messageUser = v.findViewById(R.id.message_user);
messageTime = v.findViewById(R.id.message_time);
messageText.setText(model.getMessageText());
messageUser.setText(model.getMessageUser());
messageTime.setText(DateFormat.format("dd-MM-yyyy (HH:mm:ss)", model.getMessageTime()));
}
};
listOfMessage.setAdapter(adapter);
}
我的数据库似乎没问题,输入没有错误:
{
"rules": {
".read": true,
".write": true
}
}
您需要获取数据库的引用,然后查询它:
final DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference();
根据您的要求查询类似的内容: -
Query query = reference.child("Chat_room");
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
// dataSnapshot is the "chat_room" node with all children
for (DataSnapshot issue : dataSnapshot.getChildren()) {
// do something with the individual "issues"
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
注意: - 确保已创建数据库,将聊天消息保存到数据库的结构对于您希望检索和显示聊天的方式非常重要。