Android 实现简单的分页

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1.实现分页最主要的就是封装分页代码，然后在按钮里实现相关的操作

/** * 分页工具 *  * @Project App_Page * @Package com.android.dividepage * @author chenlin * @version 1.0 * @Date 2012年6月2日 * @Note TODO * @param <T> */public class PageHelper<T> {    private List<T> allData; // 所有数据    private int perPage = 10; // 每页条目    private int currentPage = 1;// 当前页    private int pageNum = 1; // 页码    private List<T> childData;// 子数据    private int allNum;// 总共条目    public PageHelper(List<T> datas, int perPage) {        this.allData = datas;        if (perPage > 0)            this.perPage = perPage;        // 如果数据大于10条        if (allData != null && allData.size() > perPage) {            childData = allData.subList(0, perPage - 1);        }        allNum = allData.size();        // 如果总数能除断perPage，页数就是余数，否则+1        pageNum = allNum % perPage == 0 ? (allNum / perPage) : (allNum / perPage + 1);    }    public int getCount() {        return this.allNum;    }    public int getCurrentPage() {        return this.currentPage;    }    public int getPageNum() {        return this.pageNum;    }    public int getPerPage() {        return this.perPage;    }    public void gotoPage(int n) { // 页面跳转        currentPage = n > pageNum ? pageNum : (n < 1 ? 1 : n);    }    public boolean hasNextPage() {// 是否有下一页        return currentPage < pageNum;    }    public boolean hasPrePage() {// 是否有前一页        return currentPage > 1;    }    public void headPage() {// 第一页        currentPage = 1;    }    public void lastPage() {// 最后一页        currentPage = pageNum;    }    public void nextPage() {// 下一页        currentPage = hasNextPage() ? currentPage + 1 : pageNum;    }    public void prePage() {// 前一页        currentPage = hasPrePage() ? currentPage - 1 : 1;    }    public void setPerPage(int perPage) {// 设置上一页面        this.perPage = perPage;    }    /**     * 获得当前数据     * @return     */    public List<T> currentList() {        if (currentPage == 1) {            childData = allData.subList(0, perPage);        } else if (currentPage == pageNum) {            childData = allData.subList(perPage * (pageNum - 1), allNum);        } else {            childData = allData.subList(perPage * (currentPage - 1), perPage * currentPage);        }        return childData;    }    public void setCurrentPage(int currentPage) {        this.currentPage = currentPage;    }}
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2、主页里我根据tab标签把按钮设置进去，然后在click里方法读取，最后根据tag标签就可判断是哪个按钮点击了

/** * 分页主页 * @Project    App_Page * @Package    com.android.dividepage * @author     chenlin * @version    1.0 * @Date       2012年6月2日 * @Note       TODO */public class MainActivity extends Activity implements OnClickListener {    private ListView mListView;    //分页按钮    private Button mBtnPrePage, mBtnNextPage, mBtnPreItem, mBtnNextItem;    //显示分页信息    private TextView mTvPageNo;    //数据实现    private PageHelper<String> mPageDaoImpl;    private DataAdapter mAdapter;    private List<String> mDatas;    //被选着的索引    private int selectIndex = 0;    private static final int PREPAGE = 0;    private static final int NEXTPAGE = 1;    private static final int PREITEM = 2;    private static final int NEXTITEM = 3;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initViews();        initDatas();    }    private void initDatas() {        //从资源文件里读数据        mDatas = Arrays.asList(getResources().getStringArray(R.array.channellist));        //每次读8条数据        mPageDaoImpl = new PageHelper<String>(mDatas, 8);        mAdapter = new DataAdapter(this, mPageDaoImpl.currentList());        mListView.setAdapter(mAdapter);        //设置当前页码与总页码        mTvPageNo.setText(mPageDaoImpl.getCurrentPage() + " / " + mPageDaoImpl.getPageNum());    }    private void initViews() {        mListView = (ListView) findViewById(R.id.page_list);        mBtnPrePage = (Button) findViewById(R.id.pre_page);        mBtnPrePage.setTag(PREPAGE);        mBtnPrePage.setOnClickListener(this);        mBtnNextPage = (Button) findViewById(R.id.next_page);        mBtnNextPage.setTag(NEXTPAGE);        mBtnNextPage.setOnClickListener(this);        mBtnPreItem = (Button) findViewById(R.id.pre_item);        mBtnPreItem.setTag(PREITEM);        mBtnPreItem.setOnClickListener(this);        mBtnNextItem = (Button) findViewById(R.id.next_item);        mBtnNextItem.setTag(NEXTITEM);        mBtnNextItem.setOnClickListener(this);        mTvPageNo = (TextView) findViewById(R.id.pagenum);    }    @Override    public void onClick(View v) {        final int flag = (Integer) v.getTag();        switch (flag) {        case PREPAGE:// 首页            headPage();            break;        case NEXTPAGE:// 尾页            lastPage();            break;        case PREITEM:// 上一条            prePage();            break;        case NEXTITEM:// 下一条            nextPage();            break;        }    }    private void prePage() {        if (selectIndex == 0) {            if (mPageDaoImpl.getCurrentPage() >= 1) {                mPageDaoImpl.prePage();            }             mAdapter.setData(mPageDaoImpl.currentList());            mListView.setSelection(mAdapter.getCount() - 1);            mTvPageNo.setText(mPageDaoImpl.getCurrentPage() + " / " + mPageDaoImpl.getPageNum());        } else {            return;        }    }    private void nextPage() {        if (mPageDaoImpl.getCurrentPage() <= mPageDaoImpl.getPageNum()) {            mPageDaoImpl.nextPage();        }         mAdapter.setData(mPageDaoImpl.currentList());        mListView.setSelection(0);        mTvPageNo.setText(mPageDaoImpl.getCurrentPage() + " / " + mPageDaoImpl.getPageNum());    }    private void lastPage() {        if (mPageDaoImpl.getCurrentPage() != mPageDaoImpl.getPageNum()) {            mPageDaoImpl.lastPage();        }         mAdapter.setData(mPageDaoImpl.currentList());        mTvPageNo.setText(mPageDaoImpl.getCurrentPage() + " / " + mPageDaoImpl.getPageNum());    }    private void headPage() {        if (mPageDaoImpl.getCurrentPage() != 1) {            mPageDaoImpl.headPage();        }         mAdapter.setData(mPageDaoImpl.currentList());        mTvPageNo.setText(mPageDaoImpl.getCurrentPage() + " / " + mPageDaoImpl.getPageNum());    }}
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3、适配器代码，太简单了，我就不说了

public class DataAdapter extends BaseAdapter {    private Context mContext;    private List<String> mDatas;    public DataAdapter(Context context, List<String> datas) {        this.mContext = context;        this.mDatas = datas;    }    @Override    public int getCount() {        return mDatas == null ? 0 : mDatas.size();    }    @Override    public Object getItem(int position) {        return mDatas == null ? null : mDatas.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        ViewHolder mHolder;        if (convertView == null) {            convertView = LayoutInflater.from(mContext).inflate(R.layout.channel_item, parent, false);            mHolder = new ViewHolder();            mHolder.nameView = (TextView) convertView.findViewById(R.id.channel_name);            convertView.setTag(mHolder);        }        mHolder = (ViewHolder) convertView.getTag();        mHolder.nameView.setText(mDatas.get(position));        return convertView;    }    static class ViewHolder {        public TextView nameView;    }    public void setData(List<String> datas) {        mDatas = datas;        notifyDataSetChanged();    }}
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4、代码下载
链接：http://pan.baidu.com/s/1kVuAUKf 密码：lgg6