轮播图+点

MainActivity

public class MainActivity extends AppCompatActivity {    private ViewPager viewPager;    private Handler handler = new Handler(){        @Override        public void handleMessage(Message msg) {            if (msg.what == 0){                //viewPager显示下一页                viewPager.setCurrentItem(viewPager.getCurrentItem() +1);                //再次发送延时消息                handler.sendEmptyMessageDelayed(0,2000);            }        }    };    private LinearLayout linearLayout;    private List<ImageView> images;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        viewPager = (ViewPager) findViewById(R.id.view_pager);        linearLayout = (LinearLayout) findViewById(R.id.linear_layout);        //获取轮播图的数据        getDataFromNet();    }    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);        }    }    private String streamToString(InputStream inputStream,String charset) {        try {            InputStreamReader inputStreamReader = new InputStreamReader(inputStream,charset);            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);            String s = null;            StringBuilder builder = new StringBuilder();            while ((s = bufferedReader.readLine()) != null){                builder.append(s);            }            bufferedReader.close();            return builder.toString();        } catch (Exception e) {            e.printStackTrace();        }        return  null;    }}

适配器

public class MyAdapter extends PagerAdapter {    Context context;    List<DataDataBean.DataBean> list;    Handler handler;    public MyAdapter(Context context, List<DataDataBean.DataBean> list, Handler handler) {        this.context = context;        this.list = list;        this.handler = handler;    }    @Override    public int getCount() {        return Integer.MAX_VALUE;    }    @Override    public boolean isViewFromObject(View view, Object object) {        return view == object;    }    /**     * viewPager具有预加载,默认的前后加载一页,,,默认的容器里面最多三页     * @param container     * @param position     * @return     */    @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);    }}