如何使列表线程安全，以便与自定义ArrayAdapter一起使用？

Question

In my app, I am backing a ListView with a LinkedList. I am using an custom ArrayAdapter in order to fill the list:

public class CustomArrayAdapter extends ArrayAdapter<Message> {

    Context context;
    int resource;

    public CustomArrayAdapter(Context context, int resource, List<Message> messages) {
        super(context, resource, messages);
        this.context = context;
        this.resource = resource;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;
        MessageHolder messageHolder = null;

        if(row == null){
            LayoutInflater inflater = ((Activity)context).getLayoutInflater();
            row = inflater.inflate(resource, parent, false);
            messageHolder = new MessageHolder();
            messageHolder.chat_information = (TextView) row.findViewById(R.id.chat_information);
            messageHolder.chat_message = (TextView) row.findViewById(R.id.chat_message);

            row.setTag(messageHolder);
        } else {
            messageHolder = (MessageHolder) row.getTag();
        }

        Message message = getItem(position);
        messageHolder.chat_information.setText(message.getSenderName() + Constants.NEWLINE + message.getSendTime());
        messageHolder.chat_message.setText(message.getMessageText());

        return row;
    }

    private class MessageHolder {
        TextView chat_information;
        TextView chat_message;
    }
}

I realized, however, that LinkedList is not thread safe. I would like to use ConcurrentLinkedQueue or LinkedBlockingDeque , but they only return arrays, and the adapter requires a List.

Is there any way to adapt this custom ArrayAdapter to use one of these thread safe methods or will I need to iterate over the array of objects in order to fill a List to use?

Answer 1

The java.util.Collections class can be used to wrap a List, making it synchronized (ie thread safe). For example:

LinkedList<String> notThreadSafeList = new LinkedList<String>();
List<String> threadSafeList = Collections.synchronizedList(notThreadSafeList);

See also:

http://developer.android.com/reference/java/util/Collections.html#synchronizedList(java.util.List )

Answer 2

我最终将列表转换为使用内部SQLite数据库，并使用SimpleCursorAdapter备份ListView。