viewpager+gridview gridview中的个数不确定

    项目中需要一个横向滑动的分类展示，分类的个数不确定，从服务器获取后根据实际情况动态的加载viewpager的页数，找到一个demo，这边记录一下：

public class MainActivity extends Activity {private LinearLayout linear01;private LinearLayout linear02;private List<Map<String,Object>> listView;private int next = 0;private ViewPager adViewPager;private AdPageAdapter adapter;private ImageView[] imageViews;private ImageView imageView;  private AtomicInteger atomicInteger = new AtomicInteger(0);private boolean isContinue = true; private List<View> gridViewlist = new ArrayList<View>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView() {System.out.println("initView()");linear01 = (LinearLayout)findViewById(R.id.view_pager_content);linear02 = (LinearLayout)findViewById(R.id.viewGroup);listView = new ArrayList<Map<String,Object>>();//创建ViewPager    adViewPager = new ViewPager(this);        //获取屏幕像素相关信息    DisplayMetrics dm = new DisplayMetrics();        getWindowManager().getDefaultDisplay().getMetrics(dm);            //根据屏幕信息设置ViewPager广告容器的宽高        adViewPager.setLayoutParams(new LayoutParams(dm.widthPixels, dm.heightPixels));                //将ViewPager容器设置到布局文件父容器中        linear01.addView(adViewPager);            getView();        initCirclePoint();        adViewPager.setAdapter(adapter);    adViewPager.setOnPageChangeListener(new AdPageChangeListener());    }     } /** *ViewPager 页面改变监听器  */    private final class AdPageChangeListener implements OnPageChangeListener {          /**     * 页面滚动状态发生改变的时候触发     */        @Override          public void onPageScrollStateChanged(int arg0) {          }            /**         * 页面滚动的时候触发         */        @Override          public void onPageScrolled(int arg0, float arg1, int arg2) {          }            /**         * 页面选中的时候触发         */        @Override          public void onPageSelected(int arg0) {          //获取当前显示的页面是哪个页面        System.out.println("onPageSelected");            atomicInteger.getAndSet(arg0);              //重新设置原点布局集合            for (int i = 0; i < imageViews.length; i++) {                  imageViews[arg0].setBackgroundResource(R.drawable.point_focused);                  if (arg0 != i) {                      imageViews[i].setBackgroundResource(R.drawable.point_unfocused);                  }              }          }      } private void initCirclePoint(){System.out.println("initCirclePoint()");        imageViews = new ImageView[gridViewlist.size()];          //广告栏的小圆点图标        for (int i = 0; i < gridViewlist.size(); i++) {          //创建一个ImageView, 并设置宽高. 将该对象放入到数组中        imageView = new ImageView(this);        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.FILL_PARENT);      layoutParams.setMargins(10,0, 10, 0);              imageView.setLayoutParams(layoutParams);             imageViews[i] = imageView;                          //初始值, 默认第0个选中            if (i == 0) {                  imageViews[i].setBackgroundResource(R.drawable.point_focused);              } else {                  imageViews[i].setBackgroundResource(R.drawable.point_unfocused);              }             //将小圆点放入到布局中            linear02.addView(imageViews[i]);         } }private void getView() {int[] intView = {R.drawable.one,R.drawable.two,R.drawable.three,R.drawable.four,R.drawable.five,R.drawable.six,R.drawable.seven,R.drawable.eight,R.drawable.nine,R.drawable.ten,R.drawable.eleven,R.drawable.twelve,R.drawable.thirteen,R.drawable.fourteen,R.drawable.fifteen,R.drawable. sixteen,R.drawable.seventeen};for (int i = 0; i < intView.length; i++) {Map<String,Object> mapView = new HashMap<String, Object>();mapView.put("image", intView[i]);listView.add(mapView);}getGridView();}private void getGridView() {System.out.println("getGridView"+listView.size());boolean bool = true;while (bool) {int result = next+16;System.out.println("result"+result);if(listView.size() != 0&&result<listView.size()) {System.out.println("result+kkkkkkkkkk"+result);GridView gridView = new GridView(this);gridView.setNumColumns(4);List<Map<String,Object>> gridlist = new ArrayList<Map<String,Object>>();for (int i = next; i < result; i++) {gridlist.add(listView.get(i));}MyAdapter myAdapter = new MyAdapter(gridlist);gridView.setAdapter(myAdapter);next = result;gridViewlist.add(gridView);}else if(result-listView.size()<=16){System.out.println("剩余多少"+(result-listView.size()));List<Map<String,Object>> gridlist = new ArrayList<Map<String,Object>>();for (int i = next; i < listView.size(); i++) {gridlist.add(listView.get(i));}GridView gridView = new GridView(this);gridView.setNumColumns(4);MyAdapter myAdapter = new MyAdapter(gridlist);gridView.setAdapter(myAdapter);next = listView.size()-1;gridViewlist.add(gridView);bool = false;}else {System.out.println("执行了这这句话");bool = false;}}adapter = new AdPageAdapter(gridViewlist);}private final class AdPageAdapter extends PagerAdapter {          private List<View> views = null;            /**         * 初始化数据源, 即View数组         */        public AdPageAdapter(List<View> views) {              this.views = views;          }                  /**         * 从ViewPager中删除集合中对应索引的View对象         */        @Override          public void destroyItem(View container, int position, Object object) {              ((ViewPager) container).removeView(views.get(position));          }            /**         * 获取ViewPager的个数         */        @Override          public int getCount() {              return views.size();          }            /**         * 从View集合中获取对应索引的元素, 并添加到ViewPager中         */        @Override          public Object instantiateItem(View container, final int position) {              ((ViewPager) container).addView(views.get(position), 0);  //            views.get(position).setOnClickListener(new OnClickListener() {////@Override//public void onClick(View v) {//System.out.println("position"+position);//Intent intent=new Intent(MainActivity.this,OtherViewPage.class);//MainActivity.this.startActivity(intent);//}//});            return views.get(position);          }            /**         * 是否将显示的ViewPager页面与instantiateItem返回的对象进行关联         * 这个方法是必须实现的         */        @Override          public boolean isViewFromObject(View view, Object object) {              return view == object;          }      }private class MyAdapter extends BaseAdapter{List<Map<String,Object>> listgrid;private MyAdapter(List<Map<String,Object>> listgrid ) {this.listgrid = listgrid;}@Overridepublic int getCount() {return listgrid.size();}@Overridepublic Object getItem(int position) {return listgrid.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {convertView = getLayoutInflater().inflate(R.layout.grid_view_item, null);ImageView getViewLinear = (ImageView)convertView.findViewById(R.id.getViewLinear);getViewLinear.setBackgroundResource(Integer.parseInt(listgrid.get(position).get("image").toString()));return convertView;}}}

他这边是把adapter都写在了一起，比较简练，实际使用中可以分开。布局就是两个LinearLayout 。重点是getGridView()方法中的逻辑，通过一个中间的list将总共的数据分离出来，通过比较size循环判断进行添加viewpager的页数。

demo源码