小賴的實戰記錄

很久沒寫Android，一寫突然忘掉一堆，也找不到我想要的解，

自己再重寫一遍，（原來我認為的基本，結果當我需要的時候，找不到，這基本算是滿重要的）

首先要先建立自己的Model

MessageItem 如下

public class MessageItem {
    public String Title = "初始標題";
    public String Content = "知始內容";

    public String getTitle() {
        return this.Title;
    }

    public void setTitle(String value) {
        this.Title = value;
    }
    public String getContent() {
        return this.Content;
    }

    public void setContent(String value) {
        this.Content = value;
    }

}

然後建立繼承ArrayAdapter，並使用泛型

public class MessageListAdapter extends ArrayAdapter<MessageItem> {
    private Context mContext;

    static class ViewHolder{
        TextView mTitle;
        TextView mContent;
    }

    public MessageListAdapter(Context ctx) {
        super(ctx, R.layout.item_message);
        mContext = ctx;
    }

    @Override
    public View getView(int position,  View convertView, ViewGroup parent) {
        LayoutInflater inflater =  (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        ViewHolder holder;

        if (convertView == null) {
            holder = new ViewHolder();
            convertView = inflater.inflate(R.layout.item_message, null);
            holder.mTitle = (TextView) convertView.findViewById(R.id.tv_title);
            holder.mContent = (TextView) convertView.findViewById(R.id.tv_content);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        MessageItem item = this.getItem(position);

        holder.mTitle.setText(item.getTitle());
        holder.mContent.setText(item.getContent());

        return convertView;
    }
}

在Activity頁面，取得ListView 後，設定Adapter

 mListMessgae = (ListView) this.findViewById(R.id.list_message);
 mAdapter = new MessageListAdapter(this);
 mListMessgae.setAdapter(mAdapter);

這之間當然有要撈資料的部分使用

AsyncTask

    public class LoadTask extends AsyncTask<Void, Void, Void> {
        public List<MessageItem> mItems = new ArrayList<MessageItem>();
        @Override
        protected Void doInBackground(Void... voids) {
            mItems = appApi.GetMessages();
            return null;
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            super.onPostExecute(aVoid);
            mAdapter.clear();;
            mAdapter.addAll(mItems);
            mAdapter.notifyDataSetChanged();
        }
    }

Activity OnCreate的時候執行

        LoadTask task = new LoadTask();
        task.execute();

完成

我的文章竟然沒這段，重寫一遍做一個記錄。