Android首页无限轮播功能的示例代码

public class MainActivity extends AppCompatActivity {
  private ViewPager mMyViewPaper;
  private List images;
  private List dots;
  private int currentItem;
  private TextView title;
  private MyAdapter adapter;
  //当前显示图片的位置
  private int localPosition = 0;
  //图片的id
  private int[] imageIds =
    new int[]{R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d, R.drawable.e};
  //图片的标题
  private String[] titles =
    new String[]{"蓝天白云", "青山绿水", "枯藤老树", "人间仙境", "岛屿大树"};
  private TimerTask mTimerTask;
  //创建一个定时器
  private final Timer timer = new Timer();
  private ImageView mImageView;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mMyViewPaper = (ViewPager) findViewById(R.id.vp);

    //显示的图片
    images = new ArrayList<>();
    for (int i = 0; i ();
    dots.add(findViewById(R.id.dot_0));
    dots.add(findViewById(R.id.dot_1));
    dots.add(findViewById(R.id.dot_2));
    dots.add(findViewById(R.id.dot_3));
    dots.add(findViewById(R.id.dot_4));

    title = (TextView) findViewById(R.id.title);
    title.setText(titles[0]);

    adapter = new MyAdapter(MainActivity.this, images);
    mMyViewPaper.setAdapter(adapter);
    mMyViewPaper.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

    @Override
    public void onPageSelected(int position) {
      position = position % images.size();
      title.setText(titles[position]);
      dots.get(position).setBackgroundResource(R.drawable.dot_focused);
      dots.get(localPosition).setBackgroundResource(R.drawable.dot_normal);

      localPosition = position;
      currentItem = position;
    }
    /**
     * 页面滑动时回调
     */
    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {

    }
    /**
     * 当ViewPager状态改变时，回调
     */
    @Override
    public void onPageScrollStateChanged(int state) {
      }
    });
  }
    /**
     * 轮播任务
     */
    @Override
    protected void onStart() {
      super.onStart();
      mTimerTask = new TimerTask() {

    @Override
    public void run() {
      currentItem = (currentItem + 1) % imageIds.length;
      mHandler.sendEmptyMessage(0);
    }
  };
  timer.schedule(mTimerTask, 2000, 2000);
}

/**
 * 接收子线程传递的数据
 */
private Handler mHandler = new Handler() {
  public void handleMessage(android.os.Message msg) {
    //轮播到最后一张图片时，直接跳转至第一页，并且取消滑动效果
    if (currentItem % images.size() == 0) {
      mMyViewPaper.setCurrentItem(currentItem, false);
    }
    //非最后一张展示图片的滑动效果
    mMyViewPaper.setCurrentItem(currentItem, true);
  }
};

  @Override
  protected void onStop() {
    super.onStop();
    timer.cancel();
    }
}

public class MyAdapter extends PagerAdapter {
  private List images;
  private Context mContext;

  public MyAdapter(Context context,List images) {
    this.mCOntext=context;
    this.images = images;
  }
  //返回Viewpager中的view个数
  @Override
  public int getCount() {
    return Integer.MAX_VALUE;
  }

  //判断instantiateItem中的函数返回的key与一个页面示图是不是代表同一个
  //通常直接相等就OK啦
  @Override
  public boolean isViewFromObject(View arg0, Object arg1) {
    return arg0 == arg1;
  }
  //移除一个固定位置的页面
  @Override
  public void destroyItem(ViewGroup view, int position, Object object) {
    view.removeView((View) object);
  }

  //将固定位置的View添加到Viewgroup中，并创建显示出来
  @Override
  public Object instantiateItem(ViewGroup view, final int position) {
    ImageView imageView = images.get(position % images.size());
    ViewGroup parent = (ViewGroup) imageView.getParent();
    //这里是动态添加示图，一个子类只能有一个父类
    //判断下如果parent存在一定要记得移除
    if (parent != null) {
      parent.removeView(imageView);
    }
    view.addView(imageView);
    //给图片添加点击事件
    imageView.setOnClickListener(new View.OnClickListener(){
      @Override
      public void onClick(View v) {
        Toast.makeText(mContext,"点击了第"+(position % images.size()+1)+"图片",Toast.LENGTH_SHORT).show();
      }
    });
    return images.get(position % images.size());
  }

  @Override
  public int getItemPosition(Object object) {
    return POSITION_NONE;
  }
}

private Handler mHandler = new Handler() {
    public void handleMessage(android.os.Message msg) {
      //轮播到最后一张图片时，直接跳转至第一页，并且取消滑动效果
      if (currentItem % images.size() == 0) {
      mMyViewPaper.setCurrentItem(currentItem, false);
    }
    //非最后一张展示图片的滑动效果
    mMyViewPaper.setCurrentItem(currentItem, true);
  }
};