ViewPager动态添加小圆点

 private void getDataFromNet() {
        AsyncTask<Void, Void, String> asyncTask = new AsyncTask<Void, Void, String>() {
            @Override
            protected String doInBackground(Void... voids) {

                String path = "http://www.yulin520.com/a2a/impressApi/news/mergeList?pageSize=5&page=1";

                try {
                    URL url = new URL(path);

                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();

                    connection.setRequestMethod("GET");
                    connection.setReadTimeout(5000);
                    connection.setConnectTimeout(5000);

                    int responseCode = connection.getResponseCode();
                    if (responseCode == 200){
                        InputStream inputStream = connection.getInputStream();

                        String json = streamToString(inputStream,"utf-8");

                        return json;

                    }

                } catch (Exception e) {
                    e.printStackTrace();
                }

                return null;
            }

            @Override
            protected void onPostExecute(String s) {
                //打印以下数据看看是否获取到
                Log.i("----",s);

                if (s != null){
                    Gson gson = new Gson();

                    DataDataBean dataDataBean = gson.fromJson(s, DataDataBean.class);

                    List<DataDataBean.DataBean> list = dataDataBean.getData();

                    //给viewPager设置适配器
                    MyAdapter myAdapter = new MyAdapter(MainActivity.this, list,handler);

                    //设置适配器
                    viewPager.setAdapter(myAdapter);

                    //3.根据集合的长度动态添加小圆点...linearLayout
                    initDoc(list);

                    //2.手动的可以无限滑动
                    viewPager.setCurrentItem(list.size()*100000);//设置当前展示中间某个足够大的位置

                    handler.sendEmptyMessageDelayed(0,2000);//发送一个延时的空消息

                    //viewPage设置监听事件
                    viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
                        @Override
                        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

                        }

                        /**
                         * 当选中某个页面的时候,把当前的小圆点背景变成绿色
                         * @param position
                         */
                        @Override
                        public void onPageSelected(int position) {

                            for (int i=0;i<images.size();i++){
                                if (i == position%images.size()){

                                    images.get(i).setImageResource(R.drawable.shape_01);
                                }else {
                                    images.get(i).setImageResource(R.drawable.shape_02);
                                }

                            }

                        }

                        @Override
                        public void onPageScrollStateChanged(int state) {

                        }
                    });
                }

            }
        };

        asyncTask.execute();

    }

    /**
     * 动态添加小圆点
     * @param list
     */
    private void initDoc(List<DataDataBean.DataBean> list) {
        //1.需要一个集合记录一下小圆点的imageView控件
        images = new ArrayList<ImageView>();
        //2...linearLayout上面的视图清空一下再去添加
        linearLayout.removeAllViews();

        for (int i=0;i<list.size();i++){
            ImageView imageView = new ImageView(MainActivity.this);

            if (i==0){
                imageView.setImageResource(R.drawable.shape_01);
            }else {
                imageView.setImageResource(R.drawable.shape_02);
            }

            //添加到集合去
            images.add(imageView);
            //添加到线性布局上

            //这是布局参数,,刚开始小圆点之间没有距离,所以使用java代码指定宽度高度,并且指定小圆点之间的距离
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);

            params.setMargins(5,0,5,0);

            linearLayout.addView(imageView,params);
        }

    }

//下面是适配器

 @Override
    public Object instantiateItem(ViewGroup container, int position) {

        //1.把这个当前展示的视图添加到容器中...container
        ImageView imageView = new ImageView(context);

        //..........使图片平铺整个imageView控件
        imageView.setScaleType(ImageView.ScaleType.FIT_XY);

        //imageLoader加载图片到这个imageView控件上
        ImageLoader.getInstance().displayImage(list.get(position %list.size()).getImg(),imageView,ImageLoaderUtil.getDefaultOption());

        //给imageView设置触摸的监听事件
        imageView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {

                int action = motionEvent.getAction();//获取手指的动作
                switch (action){
                    case MotionEvent.ACTION_DOWN://按下的动作...应该取消发送消息的操作
                        handler.removeCallbacksAndMessages(null);

                        break;
                    case MotionEvent.ACTION_MOVE://移动的动作
                        handler.removeCallbacksAndMessages(null);

                        break;
                    case MotionEvent.ACTION_CANCEL://取消
                        //重新发送
                        handler.sendEmptyMessageDelayed(0,2000);

                        break;
                    case MotionEvent.ACTION_UP://抬起的动作
                        handler.sendEmptyMessageDelayed(0,2000);

                        break;
                }


                //返回true表示自己处理触摸事件
                return true;
            }
        });

        container.addView(imageView);//添加到容器
        //2.把当前展示的视图返回

        return imageView;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {

        //销毁视图
        container.removeView((View) object);
    }