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); } };