androidのXlist框架上拉下拉刷新案例

androidのXlist框架上拉下拉刷新案例 （不含缓存的）

1. 今天看了项目中使用XListView, 方便以后使用，做个笔记记录。

案例源码可以加扣扣群：191974931 ，方便你的学习。

     

点击查看更多，即可刷新操作。

案例中使用listview 为

<me.maxwin.view.XListView
        android:id="@+id/xListView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:cacheColorHint="#00000000"
        android:dividerHeight="1px" >
</me.maxwin.view.XListView>

首先要导入几个跟XlistView 相关的java代码。

上拉时候注意设置分页page =0. 再去查询。

下拉的时候page要实现page++， 进行分页查询。

这里数据是从服务器上获取的，详细代码如下：

public class MainActivity3 extends Activity implements IXListViewListener {
	static final int MENU_MANUAL_REFRESH = 0;
	static final int MENU_DISABLE_SCROLL = 1;
	static final int MENU_SET_MODE = 2;
	static final int MENU_DEMO = 3;
	// private List<Yilin> mListItems;
	private LinkedList<Comment> mListItems;
	private PullToRefreshListView mPullRefreshListView;
	private AIContentAdapter mAdapter;
	private static final int LOADING = 1;
	private static final int LOADING_COMPLETED = 2;
	private static final int LOADING_FAILED = 3;
	private static final int NORMAL = 4;

	private XListView mListView;
	public static final int FRIST_GET_DATE = 111;
	public static final int REFRESH_GET_DATE = 112;
	public static final int LOADMORE_GET_DATE = 113;
	private static int page = 0;
	private TextView textview;
	
	private Handler handler = new Handler() {
		@Override
		public void handleMessage(Message msg) {
			if (msg.what == 0) {
				geneItems((Integer)msg.obj);
			}
		}
	};

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_ptr_list3);

		textview=(TextView)findViewById(R.id.textview);
		mListItems = new LinkedList<Comment>();
		mListView = (XListView) findViewById(R.id.xListView);
		mListView.setPullLoadEnable(true);
		loaddata();
		mAdapter = new AIContentAdapter(MainActivity3.this, mListItems);
		mListView.setAdapter(mAdapter);
		mListView.setXListViewListener(MainActivity3.this);
	}

	private void loaddata() {
		new GetDataTask().execute(FRIST_GET_DATE);
	}

	private class GetDataTask extends
			AsyncTask<Integer, Void, LinkedList<Comment>> {

		@Override
		protected LinkedList<Comment> doInBackground(Integer... params) {
			// 处理完成后给handler发送消息
			Message msg = new Message();
			msg.what = 0;
			msg.obj=params[0];
			handler.sendMessage(msg);
			return mListItems;
		}

		@Override
		protected void onPostExecute(LinkedList<Comment> result) {
			mAdapter.notifyDataSetChanged();
			super.onPostExecute(result);
		}
	}

	// 加载，从网络端获取数据
	public LinkedList<Comment> fetchData(final int Action) {
		if(!NetworkUtils.isNetworkAvailable(MainActivity3.this)){
		     mListView.setVisibility(View.GONE);
		     textview.setVisibility(View.VISIBLE);
		     return null;
		}
		// setState(LOADING);
		Log.e("blueberry", "fetchData begin page=" + page);
		BmobQuery<Comment> query = new BmobQuery<Comment>();
		// 根据createdAt字段降序显示数据
		query.order("-createdAt");
		// 限制最多10条显示一页
		query.setLimit(10);
		// 用于控制查询显示次数，去除会刷新重复显示个数。
		query.setSkip(10 * (page++));
		query.findObjects(MainActivity3.this, new FindListener<Comment>() {

			@Override
			public void onSuccess(List<Comment> list) {
				Log.i("blueberry", "查询成功 success.list个数=" + list.size());
				if (list.size() != 0 && list.get(list.size() - 1) != null) {
					if (Action == REFRESH_GET_DATE) {
						Log.i("blueberry",
								"上刷新ListItems个数=" + mListItems.size());
						mListItems.clear();
						Log.i("blueberry",
								"上刷新清除后mListItems个数=" + mListItems.size());
					}
					// 将网络段获取的数据list集合，加入创建的list对象中
					Log.i("blueberry", "添加listview个数前=" + mListItems.size());
					mListItems.addAll(list);
					Log.i("blueberry", "添加listview个数后=" + mListItems.size());
					// setState(LOADING_COMPLETED);
					mAdapter.notifyDataSetChanged();
				} else {
					Log.i("blueberry", "当前查询list数目为0   page=" + page);
					page--;
					// setState(LOADING_FAILED);
				}
			}

			@Override
			public void onError(int arg0, String arg1) {
				page--;
				// setState(LOADING_FAILED);
			}
		});
		return mListItems;
	}

	// 设置获取直当前状态
	public void setState(int state) {
		switch (state) {
		case LOADING:
			if (mListItems.size() == 0) {
				mListView.setVisibility(View.GONE);
			}
			break;
		case LOADING_COMPLETED:
			mPullRefreshListView.setVisibility(View.VISIBLE);
			break;
		case LOADING_FAILED:
			if (mListItems.size() == 0) {
				mPullRefreshListView.setVisibility(View.VISIBLE);
			}
			break;
		case NORMAL:
			break;
		default:
			break;
		}
	}

	class AIContentAdapter extends BaseAdapter {
		public static final String TAG = "AIContentAdapter";
		private LinkedList<Comment> dataList;

		public AIContentAdapter(Context context, LinkedList<Comment> list) {
			super();
			Log.i("blueberry", "AIContentAdapter 加载");
			dataList = list;
		}

		@Override
		public int getCount() {
			return dataList.size();
		}

		@Override
		public Object getItem(int arg0) {
			return arg0;
		}

		@Override
		public long getItemId(int arg1) {
			return arg1;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			final ViewHolder viewHolder;
			if (convertView == null) {
				viewHolder = new ViewHolder();
				convertView = LayoutInflater.from(MainActivity3.this).inflate(
						R.layout.yilin_list_item, null);
				viewHolder.item_title = (TextView) convertView
						.findViewById(R.id.tv_article_title);
				convertView.setTag(viewHolder);
			} else {
				viewHolder = (ViewHolder) convertView.getTag();
			}
			System.out.println("blueberry_datalist.size=" + dataList.size());
			final Comment entity = dataList.get(position);
			// 显示单个title
			viewHolder.item_title.setText((position + 1) + "  "
					+ entity.getCommentContent());
			return convertView;
		}
	}

	public class ViewHolder {
		public TextView item_title;
	}

	@Override
	public void onRefresh() {
		new GetDataTask().execute(REFRESH_GET_DATE);
	}

	@Override
	public void onLoadMore() {
		new GetDataTask().execute(LOADMORE_GET_DATE);
	}

	@SuppressLint("SimpleDateFormat")
	private void onLoad() {
		mListView.stopRefresh();
		mListView.stopLoadMore();
		SimpleDateFormat formatter = new SimpleDateFormat(
				"yyyy年MM月dd日   HH:mm:ss");
		Date curDate = new Date(System.currentTimeMillis());// 获取当前时间
		String str = formatter.format(curDate);
		mListView.setRefreshTime(str);
	}

	private void geneItems(final int ACTION) {
		if (ACTION == FRIST_GET_DATE) {// 第一次加载
			fetchData(ACTION);
			mListView.setAdapter(mAdapter);
		} else if (ACTION == REFRESH_GET_DATE) {// 刷新数据
			page = 0;
			mListItems = fetchData(ACTION);
			mAdapter.notifyDataSetChanged();
			onLoad();
		} else if (ACTION == LOADMORE_GET_DATE) {// 加载更多
			mListItems = fetchData(ACTION);
			mAdapter.notifyDataSetChanged();
			onLoad();
		}
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
	}
}