ViewPager—02图片无限轮播

布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="200dp" >

        <android.support.v4.view.ViewPager
            android:id="@+id/vp"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

        <LinearLayout
            android:id="@+id/ll_point"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerInParent="true"
            android:layout_marginBottom="20dp"
            android:orientation="horizontal" />
    </RelativeLayout>

</RelativeLayout>

相关代码

public class MainActivity extends Activity {

    private ViewPager mViewPager;
    private LinearLayout mLlPoint;
    private MyAdapter mAdapter;

    private int[] ids = {R.drawable.a1,R.drawable.a2,R.drawable.a3};
    private List<ImageView> mImages;
    private int lastPos;
    private boolean isRunning;

    private Handler mHandler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            switch(msg.what){
            case 0:

                mViewPager.setCurrentItem(mViewPager.getCurrentItem() + 1);

                if (isRunning) {
                    mHandler.sendEmptyMessageDelayed(0,3000);
                }

                break;

            default:
                break;
            }
        };
    };

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

        initView();
        initData();

        mAdapter = new MyAdapter();
        mViewPager.setAdapter(mAdapter);
        mViewPager.addOnPageChangeListener(new PagerChnageListener());
        mViewPager.setCurrentItem((mImages.size()) * 1000);

        isRunning = true;
        mHandler.sendEmptyMessageDelayed(0,3000);
    }

    private void initView() {
        mViewPager = (ViewPager)findViewById(R.id.vp);
        mLlPoint = (LinearLayout)findViewById(R.id.ll_point);
    }

    private void initData() {

        mImages = new ArrayList<ImageView>();

        for (int i = 0;i < ids.length;i++) {
            ImageView iv = new ImageView(this);
            iv.setBackgroundResource(ids[i]);
            mImages.add(iv);

            View view = new View(this);
            view.setBackgroundResource(R.drawable.point_selector);
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(Utils.dip2px(this,10),
                    Utils.dip2px(this,10));
            if (i != 0) {
                params.leftMargin = 20;
                view.setEnabled(false);
            }else {
                view.setEnabled(true);
            }
            view.setLayoutParams(params);
            mLlPoint.addView(view);
        }
    }

    class MyAdapter extends PagerAdapter {

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

        @Override
        public boolean isViewFromObject(View arg0,Object arg1) {
            return arg0 == arg1;
        }

        @Override
        public Object instantiateItem(ViewGroup container,int position) {
            ImageView view = mImages.get(position % mImages.size());

            // 增加异常扑捉防止空白页
            try {
                ((ViewPager)container).addView(view,0);
            }catch(Exception e) {
                e.printStackTrace();
            }
            return view;
        }

        @Override
        public void destroyItem(ViewGroup container,int position,Object object) {
            // 防止2/3个出现BUG
            // container.removeView(mImages.get(position % mImages.size()));
        }
    }

    class PagerChnageListener implements OnPageChangeListener {

        /* state: 0空闲，1是滑行中，2加载完毕 */
        @Override
        public void onPageScrollStateChanged(int state) {
            switch(state){
            case 0:
                isRunning = true;
                break;
            case 1:
                isRunning = false;
                break;
            case 2:
                isRunning = true;
                break;

            default:
                break;
            }
        }

        @Override
        public void onPageScrolled(int position,float positionOffset,int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            int pos = position % mImages.size();
            mLlPoint.getChildAt(lastPos).setEnabled(false);
            mLlPoint.getChildAt(pos).setEnabled(true);
            lastPos = pos;
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        isRunning = false;
        mHandler.removeCallbacksAndMessages(null);
    }
}

 

 效果图