CODEWITHSUNDEEP
javaandroidrealm
ganlaw
ganlaw

Reputation: 1313

How to change a RealmList to RealmResult?

I am building a Java android app and I am using realm.io for my database. My problem is I have a RealmList and my Custom ListView adapter only accepts RealmResults. Below is the code and more details.

I have an Chat class that has a RealmList, RealmList, userId and a chatId.

public class Chat extends RealmObject{

private RealmList<Friend> participants;
private RealmList<Message> messages;

@PrimaryKey
private String chatId;
private String userId;

...
}

In my activity where I am trying to display all the messages that the chat has, I can call chat.getMessages() to get all the messages for this chat as a RealmList but my ListView adapter below takes a RealmResult because it extends RealmBaseAdapter

public class MessageAdapter extends RealmBaseAdapter<Message> implements ListAdapter {

private String TAG = getClass().getSimpleName();

public MessageAdapter(Context context,
                   RealmResults<Message> realmResults,
                   boolean automaticUpdate) {
    super(context, realmResults, automaticUpdate);
}


@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView == null)
    {
        convertView = inflater.inflate(R.layout.listitem_message, parent, false);
    }

    Message message = getRealmResults().get(position);

    if (message != null)
    {
        ((TextView) convertView.findViewById(R.id.message_content)).setText(message.getContent());
        DateFormat dateFormat = new SimpleDateFormat("HH:mm", Locale.CANADA);
        ((TextView) convertView.findViewById(R.id.message_time)).setText(dateFormat.format(message.getTimestamp()));
    }

    return convertView;
}

public RealmResults<Message> getRealmResults() {
    return realmResults;
}
}

Here is where I call it all

RealmList<Message> messages = chat.getMessages();

    ListView messageList = (ListView) findViewById(R.id.message_list);
    adapter = new MessageAdapter(this, messages, true);
    messageList.setAdapter(adapter);

I am open to changing my RealmList to a RealmResult if possible (I have looked and it doesn't seem to be) or If I can use a RealmList in the custom realm adapter that would another solution. Anything to help me move forward would be great help.

thanks

Upvotes: 7

Views: 3295

Answers (2)

Grimmy
Grimmy

Reputation: 2061

Just do 

chat.getMessages().where().findAll()

(Answer from here)

Upvotes: 15

beeender
beeender

Reputation: 3575

RealmBaseAdapter has a very simple implementation.

So in the case, you can pass the specific Chat to you adapter, and overload below methods:

@Override
public int getCount() {
    if (realmResults == null || realmResults.size() == 0) {
        return 0;
    }
    return realmResults.first().getMessages().size();
}

@Override
public T getItem(int i) {
    if (realmResults == null || realmResults.size() == 0) {
        return null;
    }
    return realmResults.first().getMessages().get(i);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
// You message view here
}

Upvotes: 1

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