Android模仿美团顶部的滑动菜单实例代码

/**
 * Created by CZY on 2017/6/23.
 */
public class Subject {

 //主题名
 private String name;

 //主题图标资源ID
 private int icon;

 public Subject(String name, int icon) {
  this.name = name;
  this.icon = icon;
 }

 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }

 public int getIcon() {
  return icon;
 }

 public void setIcon(int icon) {
  this.icon = icon;
 }

}

/**
 * Created by CZY on 2017/6/23.
 */
public class GridViewAdapter extends BaseAdapter {

 private List subjectList;

 private LayoutInflater layoutInflater;

 //当前页索引
 private int currentIndex;

 //占满屏幕时每页展示的主题个数
 private int pageSize;

 public GridViewAdapter(Context context, List subjectList, int currentIndex, int pageSize) {
  this.layoutInflater = LayoutInflater.from(context);
  this.subjectList = subjectList;
  this.currentIndex = currentIndex;
  this.pageSize = pageSize;
 }

 /**
  * 如果剩余数据能够完全占满当前页，则返回 pageSize
  * 如果不能，则返回剩余的数据个数
  */
 @Override
 public int getCount() {
  return subjectList.size() > (currentIndex + 1) * pageSize &＃63; pageSize : (subjectList.size() - currentIndex * pageSize);
 }

 /**
  * 计算出正确的索引
  */
 @Override
 public Object getItem(int position) {
  return subjectList.get(position + currentIndex * pageSize);
 }

 @Override
 public long getItemId(int position) {
  return position + currentIndex * pageSize;
 }

 @Override
 public View getView(int position, View convertView, ViewGroup parent) {
  ViewHolder viewHolder;
  if (cOnvertView== null) {
   cOnvertView= layoutInflater.inflate(R.layout.item_grid_view, parent, false);
   viewHolder = new ViewHolder();
   viewHolder.tv_subject = (TextView) convertView.findViewById(R.id.tv_subject);
   viewHolder.iv_subject = (ImageView) convertView.findViewById(R.id.iv_subject);
   convertView.setTag(viewHolder);
  } else {
   viewHolder = (ViewHolder) convertView.getTag();
  }
  int pos = position + currentIndex * pageSize;
  viewHolder.tv_subject.setText(subjectList.get(pos).getName());
  viewHolder.iv_subject.setImageResource(subjectList.get(pos).getIcon());
  return convertView;
 }

 private class ViewHolder {

  private TextView tv_subject;

  private ImageView iv_subject;

 }

}

<&＃63;xml version="1.0" encoding="utf-8"&＃63;>


 

 

/**
 * Created by CZY on 2017/6/23.
 */
public class ViewPagerAdapter extends PagerAdapter {

 private List viewList;

 public ViewPagerAdapter(List viewList) {
  this.viewList = viewList;
 }

 @Override
 public void destroyItem(ViewGroup container, int position, Object object) {
  container.removeView(viewList.get(position));
 }

 @Override
 public Object instantiateItem(ViewGroup container, int position) {
  container.addView(viewList.get(position));
  return (viewList.get(position));
 }

 @Override
 public int getCount() {
  return viewList == null &＃63; 0 : viewList.size();
 }

 @Override
 public boolean isViewFromObject(View view, Object object) {
  return view == object;
 }

}

public class MainActivity extends AppCompatActivity {

 private String[] titles = {"美食", "电影", "酒店住宿", "休闲娱乐", "甜品饮品",
   "水上乐园", "汽车服务", "美发", "丽人", "景点",
   "足疗按摩", "运动健身", "健身", "超市", "买菜",
   "今日新单", "外卖", "自助餐", "KTV", "机票/火车票",
   "周边游", "小吃快餐", "面膜", "美甲美睫", "火锅",
   "生日蛋糕", "母婴亲子", "生活服务", "婚纱摄影", "学习培训",
   "家装", "结婚"};

 private List subjectList;

 private LinearLayout ll_dot;

 //每页展示的主题个数
 private final int pageSize = 10;

 //当前页索引
 private int currentIndex;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);
  ll_dot = (LinearLayout) findViewById(R.id.ll_dot);
  subjectList = new ArrayList<>();
  for (String title : titles) {
   subjectList.add(new Subject(title, R.drawable.icon));
  }
  //需要的页面数
  int pageCount = (int) Math.ceil(subjectList.size() * 1.0 / pageSize);
  List viewList = new ArrayList<>();
  for (int i = 0; i  parent, View view, int position, long id) {
     int pos = position + currentIndex * pageSize;
     Toast.makeText(MainActivity.this, subjectList.get(pos).getName(), Toast.LENGTH_SHORT).show();
    }
   });
  }
  viewPager.setAdapter(new ViewPagerAdapter(viewList));
  for (int i = 0; i