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Read messages from database. #10

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Read messages from database. #10

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18 changes: 18 additions & 0 deletions app/src/main/java/com/google/firebase/udacity/friendlychat/MainActivity.java
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,9 @@
import android.widget.ListView;
import android.widget.ProgressBar;

import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

Expand All @@ -55,6 +58,7 @@ public class MainActivity extends AppCompatActivity {
// Firebase instance variables
private FirebaseDatabase mFirebaseDatabase;
private DatabaseReference mMessagesDatabaseReference;
private ChildEventListener mChildEventListener;

@Override
protected void onCreate(Bundle savedInstanceState) {
Expand Down Expand Up @@ -123,6 +127,20 @@ public void onClick(View view) {
mMessageEditText.setText("");
}
});

mChildEventListener = new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
FriendlyMessage friendlyMessage = dataSnapshot.getValue(FriendlyMessage.class);
mMessageAdapter.add(friendlyMessage);
}

public void onChildChanged(DataSnapshot dataSnapshot, String s) {}
public void onChildRemoved(DataSnapshot dataSnapshot) {}
public void onChildMoved(DataSnapshot dataSnapshot, String s) {}
public void onCancelled(DatabaseError databaseError) {}
};
mMessagesDatabaseReference.addChildEventListener(mChildEventListener);
}

@Override
Expand Down