How can I use different layouts with my ListView depending on data coming from the on-board SQLite database?

Question

My android app has a simple chat function. The chats are stored in the on-board SQLite database. I am using a ListView with a SimpleCursorAdapter to display the chats. This is what I have:

public class Chat extends Fragment {
    private View rootView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        rootView = inflater.inflate(R.layout.chat, container, false);
        return rootView;
    }

    @Override
    public void onViewCreated(View rootView, Bundle savedInstanceState){
        super.onViewCreated(rootView, savedInstanceState);
        displayChats();
    }

    public void displayChats(){
        DatabaseHelper databaseHelper = new DatabaseHelper(getActivity());
        Cursor chatCursor = databaseHelper.getChatsCursor();
        String[] fromColumns = {"messageInfo","messageText"};
        int toViews{R.id.message_info, R.id.message_text};
        SimpleCursorAdapter simpleCursorAdapter = new SimpleCursorAdapter(getContext(), R.layout.line_of_chat, chatCursor, fromColumns, toViews, 0);
        ListView listView = (ListView) rootView.findViewById(R.id.chat_text_display);
        listView.setAdapter(simpleCursorAdapter);
        databaseHelper.close();
    }
}

I have a chat model that has a boolean, named localFlag, as one of its fields. If the chat is sent from the device, localFlag is set as true (or 1), if the chat is received from external to the device, localFlag is set as false (or 0).

My SQL call:

public static final String GET_ALL_CHATS = "select _id, localFlag, messageText, messageInfo from ChatTable";

public Cursor getChatsCursor(){
    SQLiteDatabase sqliteDB = this.getReadableDatabase();
    return sqliteDB.rawQuery(GET_ALL_CHATS, null);
}

What I want to do is if the local flag is set, I would like to use this:

SimpleCursorAdapter simpleCursorAdapter = new SimpleCursorAdapter(getContext(), R.layout.outgoing_line_of_chat, chatCursor, fromColumns, toViews, 0);

and if the local flag is not set, I would like to use this:

SimpleCursorAdapter simpleCursorAdapter = new SimpleCursorAdapter(getContext(), R.layout.incoming_line_of_chat, chatCursor, fromColumns, toViews, 0);

Notice I want to use R.layout.outgoing_line_of_chat vs R.layout.incoming_line_of_chat.

How can I go about accomplishing this?

score 1 · Accepted Answer · edited May 23 '17 at 12:23

1

Use getItemViewType() and getViewTypeCount() in your adapter to inform ListView that there are different row types being displayed, so that it can provide the proper view as the convertView argument to getView(). Refer to this answer, and also to a video called The World of ListView for a fuller explanation.

EDIT

You will have to subclass SimpleCursorAdapter (although you might want to subclass CursorAdapter instead) in order to override those methods.

Aside: you may want to consider using RecyclerView instead of ListView. The principle is the same, but with a RecyclerView adapter you only need to implement getItemViewType().

edited May 23 '17 at 12:23

Community

1
1

answered May 11 '16 at 14:35

Karakuri

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The [link](http://stackoverflow.com/a/24915547/1207921) didn't really seem to apply to my situation. Thank you, though. – P. Alston May 11 '16 at 15:04
@P.Alston It applies exactly to your situation. Ignore the first paragraph and the rest of the answer describes exactly how to make your `ListView` show two different row types. The only difference is how you would implement `getItemViewType()`. In your case, you would check the value of `localFlag` at the specified position. – Karakuri May 11 '16 at 15:24
I have no idea where to override those two methods. I know it's not available in my Chat class. – P. Alston May 11 '16 at 15:40
I found [this](http://stackoverflow.com/questions/12180724/inflate-layout-on-listitem-based-on-listitem-specific-variable) post with example code that also helped out. – P. Alston May 11 '16 at 20:06

How can I use different layouts with my ListView depending on data coming from the on-board SQLite database?

1 Answers1