AndroidViewPager循环播放广告实例详解

public class MainActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener {

  private List vpLists;
  private LinearLayout ll_dot_group; //用来添加小圆点
  private String[] imageDescArrs;
  private TextView tv_img_desc;
  private ViewPager vp;

  private boolean isSwitchPager = false; //默认不切换
  private int previousPosition = 0; //默认为0

  private Handler handler = new Handler() {
    public void handleMessage(android.os.Message msg) {
      //更新当前viewpager的 要显示的当前条目
      vp.setCurrentItem(vp.getCurrentItem() + 1);
    }
  };

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initView();
  }

  /**
   * 初始化view
   */
  private void initView() {
    vp = (ViewPager) findViewById(R.id.vp);
    ll_dot_group = (LinearLayout) findViewById(R.id.ll_dot_group);
    tv_img_desc = (TextView) findViewById(R.id.tv_img_desc);

    initViewPagerData();
    vp.setAdapter(new ViewpagerAdapter());

    //设置当前viewpager要显示第几个条目
    int item = Integer.MAX_VALUE / 2 - (Integer.MAX_VALUE / 2 % vpLists.size());
    vp.setCurrentItem(item);

    //把第一个小圆点设置为白色，显示第一个textview内容
    ll_dot_group.getChildAt(previousPosition).setEnabled(true);
    tv_img_desc.setText(imageDescArrs[previousPosition]);
    //设置viewpager滑动的监听事件
    vp.addOnPageChangeListener(this);

    //实现自动切换的功能
    new Thread() {
      public void run() {
        while (!isSwitchPager) {
          SystemClock.sleep(3000);
          //拿着我们创建的handler 发消息
          handler.sendEmptyMessage(0);
        }
      }
    }.start();
  }

  /**
   * 初始化ViewPager的数据
   */
  private void initViewPagerData() {
    imageDescArrs = new String[]{"标题1", "标题2", "标题3", "标题4", "标题5"};
    vpLists = new ArrayList();
    int imgIds[] = {R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d, R.drawable.e};
    ImageView iv;
    View dotView;

    for (int i = 0; i 

public int getCount() {
  return Integer.MAX_VALUE;
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
  //拿着position位置 % 集合.size
  int newposition = position % vpLists.size();
  //获取到条目要显示的内容imageview
  ImageView iv = vpLists.get(newposition);
  //要把 iv加入到 container 中
  container.addView(iv);
  return iv;
}

int item = Integer.MAX_VALUE / 2 - (Integer.MAX_VALUE / 2 % vpLists.size());
vp.setCurrentItem(item);

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