如何使我的列表线程安全,以便将其与自定义ArrayAdapter一起使用?

时间:2016-04-22 14:23:52

标签: android android-arrayadapter

在我的应用中,我使用LinkedList支持ListView。我正在使用自定义ArrayAdapter来填充列表:

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;
    }
}
但是,我意识到LinkedList不是线程安全的。我想使用ConcurrentLinkedQueueLinkedBlockingDeque,但它们只返回数组,而适配器需要List。

有没有办法调整这个自定义ArrayAdapter以使用其中一个线程安全方法,还是需要迭代对象数组以填充要使用的List?

2 个答案:

答案 0 :(得分:0)

java.util.Collections类可用于包装List,使其同步(即线程安全)。例如:

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

另见:

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

答案 1 :(得分:0)

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