viewpager 无限轮播

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:drawable="@drawable/point_red" android:state_enabled="true"></item>    <item android:drawable="@drawable/point_green" android:state_enabled="false"></item></selector>

<shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="oval">    <solid android:color="@android:color/holo_green_light"></solid></shape>

<shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="oval">    <solid android:color="@android:color/holo_red_light"></solid></shape>

布局：

<android.support.v4.view.ViewPager    android:id="@+id/vp"    android:layout_width="match_parent"    android:layout_height="480dp"/><LinearLayout    android:id="@+id/ll_point"    android:layout_width="match_parent"    android:layout_height="20dp"    android:orientation="horizontal"    android:layout_alignBottom="@id/vp"    android:layout_marginBottom="20dp"    android:gravity="center"></LinearLayout>

代码：

public class MainActivity extends AppCompatActivity {    private ViewPager vp;    private LinearLayout ll_point;    private List<ImageView> images = new ArrayList<>();    private int [] x = new int[]{R.mipmap.a,R.mipmap.b,R.mipmap.c};    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //找控件        initView();        initViewPager();    }    private void initView() {        vp = (ViewPager) findViewById(R.id.vp);        ll_point = (LinearLayout) findViewById(R.id.ll_point);    }    private void initViewPager() {        for (int i = 0; i < x.length; i++) {            ImageView imageView = new ImageView(MainActivity.this);            imageView.setImageResource(x[i]);            images.add(imageView);        }        MyAdapter adapter = new MyAdapter();        vp.setAdapter(adapter);        initPoint();        vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {            @Override            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {            }            @Override            public void onPageSelected(int position) {                //获取小圆点数据                int count = ll_point.getChildCount();                for (int i = 0; i < count; i++) {                    View view = ll_point.getChildAt(i);                    //页面改变时选中小圆点                    view.setEnabled(i == position ? false : true);                }            }            @Override            public void onPageScrollStateChanged(int state) {            }        });    }    private void initPoint() {        for (int i = 0; i < images.size(); i++) {            //   Toast.makeText(MainActivity.this, "图片个数："+images.size(), Toast.LENGTH_SHORT).show();            //创建小圆点控件            View view = new View(this);            //设置背景选择器            view.setBackgroundResource(R.drawable.point_bg);            //创建小圆点大小            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(20, 20);            //创建小圆点间距            params.rightMargin = 10;            //把小圆点添加容器            ll_point.addView(view, params);            view.setTag(i);        }        //设置第一个为默认选择        View view = ll_point.getChildAt(0);        view.setEnabled(false);    }    //定义handler    private Handler handler = new Handler();    //开启    public void startSwitch() {        handler.postDelayed(new Runnable() {            @Override            public void run() {                int item = vp.getCurrentItem();                if (item == vp.getAdapter().getCount() - 1) {                    item = 0;                } else {                    item++;                }                vp.setCurrentItem(item);                handler.postDelayed(this, 2000);            }        }, 2000);    }    //停止    public void stopSwitch() {        handler.removeCallbacksAndMessages(null);    }    //创建适配器    private class MyAdapter extends PagerAdapter {        @Override        public int getCount() {            return images.size();        }        @Override        public boolean isViewFromObject(View view, Object object) {            return view == object;        }        @Override        public Object instantiateItem(ViewGroup container, int position) {            ImageView imageView = images.get(position);            container.addView(imageView);            return imageView;        }        @Override        public void destroyItem(ViewGroup container, int position, Object object) {            container.removeView(images.get(position));        }    }    @Override    protected void onResume() {        super.onResume();        startSwitch();    }    @Override    protected void onPause() {        super.onPause();        stopSwitch();    }}

另一种

@Overridepublic void onPageSelected(int position) {    for (int i = 0;i<images.size();i++){        View view = ll.getChildAt(i);        view.setEnabled(i == position%images.size()?false:true);    }}

private class MyAdapter extends PagerAdapter {    @Override    public int getCount() {        return Integer.MAX_VALUE;    }

@Overridepublic Object instantiateItem(ViewGroup container, int position) {    ImageView imageView = images.get(position%images.size());    container.addView(imageView);    return imageView;}

public void startSwitch(){    handler.postDelayed(new Runnable() {        @Override        public void run() {            int currentItem = vp.getCurrentItem();            currentItem++;            vp.setCurrentItem(currentItem);            handler.postDelayed(this,2000);        }    },2000);}