I have created a custom listview and a custom adapter. I want to load the data from firebase but i dont know how to. I have gone through a lot of posts but it doesnt help me. I need someone to walk me through.
What I need is for someone to tell me how i can retrieve the data;
Data Model:
public class MessagesListDataModel {
private String uid;
private String msg;
public MessagesListDataModel(){
}
public MessagesListDataModel(String UID, String Message){
this.uid = UID;
this.uid = Message;
}//instance of datamodel
public String getUID(){
return uid;
}
public String getMessage(){
return msg;
}
}
Custom Adapter:
public class MessagesListAdapter extends ArrayAdapter<MessagesListDataModel> {
private ArrayList<MessagesListDataModel> dataModels;
public MessagesListAdapter(Context context, int resource, ArrayList<MessagesListDataModel> dataModels){
super(context, resource, dataModels);
this.dataModels = dataModels;
}
public View getView(int position, View convertView, ViewGroup parent){
View v = convertView;
if (v == null) {
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.chat_messages_layout, null);
}
MessagesListDataModel MessagesListDataModel = dataModels.get(position);
if (MessagesListDataModel != null) {
// These TextViews are created in the XML files defined.
TextView uid = (TextView) v.findViewById(R.id.textViewMessage);
TextView message = (TextView) v.findViewById(R.id.textViewUserID);
// check to see if each individual textview is null.
// if not, assign some text!
if (uid != null){
uid.setText(MessagesListDataModel.getUID());
}
if (message != null){
message.setText(MessagesListDataModel.getMessage());
}
}
// the view must be returned to our activity
return v;
}
}
In Main:
chatroomsref = FirebaseDatabase.getInstance().getReference("Chatrooms");
///////
ListViewMessages = (ListView) findViewById(R.id.chatRoomMessagesListview);
ArrayAdapter<MessagesListAdapter> arrayAdapter = new ArrayAdapter<MessagesListAdapter>(this, R.layout.chat_messages_layout,messages);
ListViewMessages.setAdapter(arrayAdapter);
chatroomsref.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
fetchData();
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
fetchData:
I need to know how to fetch the data so that it iterates through all the chat rooms witha unique id and them takes that data from the database and assign it to those textviews and displays the data so that i can run this function in the database reference. but i dont know how?
So what i did in main is :
room_name = getIntent().getExtras().get("room_name").toString();
the listview which i have of all the chatrooms has a click even listener where when the room is clicked it passes on the room name as a string into the activity where all of this is supposed to happen. So i took that variable to be passed retrieved so that the reference is updated when the specific room is entered:
chatroomsref = FirebaseDatabase.getInstance().getReference("Chatrooms").child(room_name);
But now i get this error:
Process: com.brunelcs.group13.anyquestions, PID: 14662 java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:437)
XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/textViewUserID"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginStart="12dp"
android:layout_marginTop="14dp"
android:layout_weight="1"
android:text="UserID"
android:textAlignment="viewStart"
android:textColor="@color/colorPrimary"
android:textSize="12sp" />
<TextView
android:id="@+id/textViewDateTime"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/textViewUserID"
android:layout_marginStart="11dp"
android:layout_toEndOf="@+id/textViewUserID"
android:text="DateTime"
android:textAlignment="center"
android:textColor="@color/colorPrimary"
android:textSize="12sp" />
<TextView
android:id="@+id/textViewMessage"
android:layout_width="500dp"
android:layout_height="50dp"
android:layout_alignStart="@+id/textViewUserID"
android:layout_below="@+id/textViewUserID"
android:text="Message"
android:textAlignment="viewStart"
android:textSize="15dp" />
<Button
android:id="@+id/button5"
android:layout_width="100dp"
android:layout_height="40dp"
android:layout_alignStart="@+id/textViewMessage"
android:layout_below="@+id/textViewMessage"
android:text="Replies" />
<Button
android:id="@+id/button6"
android:layout_width="100dp"
android:layout_height="40dp"
android:layout_alignBottom="@+id/button5"
android:layout_alignStart="@+id/textViewDateTime"
android:text="Like" />
<TextView
android:id="@+id/textView11"
android:layout_width="30dp"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/button6"
android:layout_marginBottom="13dp"
android:layout_toEndOf="@+id/button6"
android:text="24"
android:textAlignment="center" />
Also shouldnt i use:
//for (DataSnapshot child : dataSnapshot.getChildren()) {
}
and retrieve the data there for each child of the room? But i dont know how to.
