ListView分页加载

来源：互联网发布：淘宝人参编辑：程序博客网时间：2024/04/29 14:14
1.总的思路是：用一个List来每次加载需要显示的数据。加载完后，此List要清空。
2.具体代码
public class MainActivity extends Activity implements OnClickListener {    // 数据源    private String[] strs = new String[] { "1w", "de", "cdc", "vre", "vae",            "cvds", "ergt", "trh", "jyyku", "yuk", "ytuuu", "koi", "awee",            "qwe", "zdss", "oui", "hjg", "chcfg", "xcvsdr", "asfa", "fb",            "breq", "WEGRG", "fsr", "awaw", "grtt", "trh", "nh", "xfds",            "serew", "hn", "11322" };    // 临时存储需要加载的数据    private ArrayList<String> list = new ArrayList<String>();    private ListView listView = null;    //上一页按钮    private Button bt_previousPage = null;    //下一页按钮    private Button bt_nextPage = null;    //显示当前是第几页    private TextView tv_currentPage = null;    //显示总页数    private TextView tv_totalPage = null;    // 总的数据条数    private int size = 0;    // 当前页    private int page = 0;    // 总页数    private int totalPages = 0;    // 一页要显示的条数    private int pageSize = 10;    //自定义显示的适配器    private StrAdapter adapter = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // 初始化控件        findViews();        // 得到总的数据条数        size = strs.length;        // 得到总的页数        if (size % pageSize == 0) {            totalPages = size / pageSize;        } else {            totalPages = size / pageSize + 1;        }        // 显示总页数        tv_totalPage.setText(totalPages + "");        // 开始分页显示        if (size > pageSize) {            for (int i = 0; i < pageSize; i++) {                //加载需要显示的数据                list.add(strs[i]);            }            //还需要显示的数据            size = size - pageSize;            //当前页数+1            page++;        } else {            for (int i = 0; i < strs.length; i++) {                list.add(strs[i]);            }            page++;        }        // 显示当前页数        tv_currentPage.setText(page + "");        // 绑定适配器显示数据        adapter = new StrAdapter(this, list);        listView.setAdapter(adapter);        // 监听点击事件        bt_previousPage.setOnClickListener(this);        bt_nextPage.setOnClickListener(this);    }    // 加载下一页    public void getNextPageData() {        if (size > pageSize) {            list.clear();            for (int i = 0; i < pageSize; i++) {                list.add(strs[i + page * 10]);            }            size = size - pageSize;            page++;        } else if (size > 0 && size <= pageSize) {            list.clear();            for (int i = 0; i < size; i++) {                list.add(strs[i + page * pageSize]);            }            size = size - pageSize;            page++;        } else {        }        // 更新当前页        tv_currentPage.setText(page + "");    }    public void getPreviousPageData() {        if (page >= 2) {            list.clear();            for (int i = 0; i < 10; i++) {                list.add(strs[i + (page - 2) * pageSize]);            }            page--;        } else {        }        size = strs.length - page * pageSize;        // 更新当前页        tv_currentPage.setText(page + "");    }    @Override    public void onClick(View v) {        // TODO Auto-generated method stub        if (v.getId() == R.id.bt_nextPage) {            getNextPageData();            adapter.notifyDataSetChanged();        } else if (v.getId() == R.id.bt_previousPage) {            getPreviousPageData();            adapter.notifyDataSetChanged();        }    }    public void findViews() {        listView = (ListView) findViewById(R.id.listview);        bt_previousPage = (Button) findViewById(R.id.bt_previousPage);        bt_nextPage = (Button) findViewById(R.id.bt_nextPage);        tv_currentPage = (TextView) findViewById(R.id.tv_currentPage);        tv_totalPage = (TextView) findViewById(R.id.tv_totalPage);    }}  public class StrAdapter extends BaseAdapter {        private Context context;    private ArrayList<String> list = null;    public StrAdapter(Context context,ArrayList<String> list){        super();        this.context = context;        this.list = list;    }        @Override    public int getCount() {        // TODO Auto-generated method stub        return list.size();    }    @Override    public Object getItem(int arg0) {        // TODO Auto-generated method stub        return arg0;    }    @Override    public long getItemId(int arg0) {        // TODO Auto-generated method stub        return arg0;    }    @Override    public View getView(int position, View convertView, ViewGroup arg2) {        // TODO Auto-generated method stub        ViewHolder viewHolder = null;        if (convertView == null) {            View view = LayoutInflater.from(context).inflate(                    R.layout.str_adapter, null);            viewHolder = new ViewHolder();            viewHolder.tv = (TextView) view.findViewById(R.id.tv_str);            view.setTag(viewHolder);            convertView = view;        } else {            viewHolder = (ViewHolder) convertView.getTag();        }        viewHolder.tv.setText(list.get(position).toString());        return convertView;    }        class ViewHolder {        TextView tv;    }}
3.效果
如图~
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