Android自定义控件之ListView的下拉刷新与上拉加载
开发项目过程中基本都会用到listView的下拉刷新和上滑加载更多,为了方便重写的ListView来实现下拉刷新,同时添加了上拉自动加载更多的功能。
Android下拉刷新可以分为两种情况:
1.获取更多的数据,按服务器数据库时间顺序存储入情况,此刻我们是获取是显示在我们应用中的数据更早前的数据,这也是最常见的情况。比如(微博获取更多信息,就是获取更多更早前的信息,然后动态的添加到已有的数据的下方);
2.获取更多的最新的数据,其实还是一种获取更多的操作方式。但是这里主要考虑到用户的操作习惯了。一般,用户的操作习惯分这么两种。
示例代码
public class MainActivity extends Activity implements IXListViewListener { private XListView listView; private int in = 6; private Adapter adapter; private Handler mHandler; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { // TODO Auto-generated method stub listView = (XListView) findViewById(R.id.list); listView.setPullLoadEnable(true); adapter = new Adapter(MainActivity.this); listView.setAdapter(adapter); listView.setXListViewListener(this); mHandler = new Handler(); } private void onLoad() { listView.stopRefresh(); listView.stopLoadMore(); listView.setRefreshTime("刚刚"); } @Override public void onRefresh() { mHandler.postDelayed(new Runnable() { @Override public void run() { onLoad(); } }, 2000); } @Override public void onLoadMore() { mHandler.postDelayed(new Runnable() { @Override public void run() { in += 4; onLoad(); } }, 2000); } private static String[] string = new String[] { "民政局于,请带好相关证件文书 ", "财政部发布公告,由于资金调整信息未完善,下周在发放工资,请各位见谅", "信息部门于2016-11-11日在某某地方开会,特此通知,请带好相关证件", "党政办发放通知,有关贫困地区扶贫政策,希望每个部门做出相应的方案,于2016-11-11开会讨论" }; public class Adapter extends BaseAdapter { private Context context; private LayoutInflater inflater; public Adapter(Context context) { // TODO Auto-generated constructor stub this.context = context; inflater = LayoutInflater.from(context); } @Override public int getCount() { // TODO Auto-generated method stub return in; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return position; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub ViewHolder holder = null; final int index = position; if (convertView == null) { convertView = inflater.inflate(R.layout.item_news_mass, null); holder = new ViewHolder(convertView); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.mName.setText(string[(position % 4)]); return convertView; } class ViewHolder { private ImageView mImageView; private TextView mName; public ViewHolder(View view) { mName = (TextView) view.findViewById(R.id.item_news_msg); } } } }
<com.example.pullablerefresh.XListView android:id="@+id/list" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="5dp" android:background="#FFFFFF" android:cacheColorHint="#00000000" android:divider="#FFFFFF" android:dividerHeight="5dp" android:drawSelectorOnTop="false" android:listSelector="#00000000" android:scrollbars="none" android:scrollingCache="false" />
由于代码太多,完整代码未给出,源码直接下载即可
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