android ViewPager实现无限轮播和设置监听事件

ViewPager的无限轮播，主要以实现为主。代码如下

首先定义activity_viewpager.xml：

<LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <android.support.v4.view.ViewPager
                android:id="@+id/viewpager"
                android:layout_width="wrap_content"
                android:layout_height="200dp" />

             <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="-20dp"
                android:orientation="vertical">

                <TextView
                    android:id="@+id/viewpager_head_title"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:gravity="center_vertical"
                    android:textColor="@color/text_black"/>

                <LinearLayout
                    android:id="@+id/points"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:gravity="center_horizontal"
                    android:orientation="horizontal" />
            </LinearLayout>
  </LinearLayout>

point的效果

point_enable.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <corners android:radius="0.5dp" />
    <solid android:color="#AAFFFFFF" />
</shape>

point_normal.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval" >
    <corners android:radius="0.5dp" />
    <solid android:color="#55000000" />
</shape>

point_background.xml

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

在ViewPagerActivity.java去实现具体功能，代码如下所示：

public class ViewPagerActivity extends Activity {
    private ViewPager mViewPager;
    private LinearLayout mLinearLayout;
    private FirstVPageAdapter mFirstVPageAdapter;
    private TextView mVPtitle;

    private List<ImageView> mImageViewList;

    // 圆圈标志位
    private int pointIndex = 0;

    private int[] listImages {R.mipmap.photo1,R.mipmap.phonto2,R.mipmap.house_photo3,R.mipmap.photo4, R.mipmap.photo5};
    // 文字
    private String[] listTexts = {"", "", "", ""};

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

    public void initView() {
        mLinearLayout = (LinearLayout) findViewById(R.id.points);
        mVPtitle = (TextView) findViewById(R.id.viewpager_head_title);
        mViewPager = (ViewPager) findViewById(R.id.viewpager);
        mViewPager.setCurrentItem(0);

        // 定时循环
        mHandler.postDelayed(mRunnable, 3000);
        initData();
        initAction();
    }

    final Handler mHandler = new Handler();
    Runnable mRunnable = new Runnable() {
        @Override
        public void run() {
            mViewPager.setCurrentItem(mViewPager.getCurrentItem() + 1);
            mHandler.postDelayed(this, 3000);
        }
    };

    View view;
    private void initData() {
        mImageViewList = new ArrayList<>();
        for (int i = 0; i < listImages.length; i++) {
            // imageView
            ImageView imageView = new ImageView(this);
            imageView.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
            imageView.setBackgroundResource(listImages[i]);
            imageView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    //在这里做点击事件
                    Intent intent = new Intent();
                    intent.setClass(ViewPagerActivity.this, Activity.class);
                    startActivity(intent);
                    mHandler.removeCallbacks(mRunnable);
                }
            });
            mImageViewList.add(imageView);
        }

        points();
        mFirstVPageAdapter = new FirstVPageAdapter(mImageViewList);
        mViewPager.setAdapter(mFirstVPageAdapter);
    }

    public void points() {
        mLinearLayout.removeAllViews();
        for (int i = 0; i < 5; i++) {
            LayoutParams params;
            view = new View(this);
            params = new LayoutParams(20, 20);
            params.leftMargin = 40;
            view.setBackgroundResource(R.drawable.point_background);
            view.setLayoutParams(params);
            view.setEnabled(false);
            mLinearLayout.addView(view);
        }
    }

    /**
     * 初始化事件
     */
    private void initAction() {
        PageListener mPageListener = new PageListener();
        //监听事件
        mViewPager.setOnPageChangeListener(mPageListener);
        //计算启始位置
        int index = (Integer.MAX_VALUE / 2) - (Integer.MAX_VALUE / 2 % mImageViewList.size());
        //用来触发监听器
        mViewPager.setCurrentItem(index);
        mLinearLayout.getChildAt(pointIndex).setEnabled(true);
    }

    class PageListener implements OnPageChangeListener {

        @Override
        public void onPageScrollStateChanged(int arg0) {
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
        }

        @Override
        public void onPageSelected(int position) {
            int newPosition = position % listImages.length;
//            mVPtitle.setText(titles[newPosition]);
            mLinearLayout.getChildAt(newPosition).setEnabled(true);
            mLinearLayout.getChildAt(pointIndex).setEnabled(false);
            // 更新标志位
            pointIndex = newPosition;

        }
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        mHandler.removeCallbacks(mRunnable);
    }
}

接着实现ViewPagerAdapter.java适配器，代码如下所示：

public class FirstVPageAdapter extends PagerAdapter {

    private List<ImageView> mList;

    public FirstVPageAdapter(List<ImageView> list) {
        this.mList = list;
    }

    @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) {
        container.addView(mList.get(position%mList.size()));
        return mList.get(position%mList.size());
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView(mList.get(position%mList.size()));
    }
}

好了，viewpager的无限轮播实现完成了。