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);

}

}

}

}

```



源码下载:https://github.com/DickyQie/android-list-control

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