重要的地方都加了註釋，

public class MyViewpagerFragment extends Activity {

    private ViewPager mViewPager;
    private List<View> mViews = new ArrayList<>();//輪播頁集合
    private ImageView[] mImageViews;//指示點集合
    private ImageView imageView ;
    private LinearLayout mDot;//指示點

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

        initView();

    }

    private void initView() {
        mViewPager = (ViewPager) findViewById(R.id.id_viewpager);
        mDot = (LinearLayout) findViewById(R.id.viewGroup);
        /**將佈局新增到 Viewpager 中*/
 

        LayoutInflater inflater = LayoutInflater.from(this);
        View tab01 =  inflater.inflate(R.layout.tan01, null);
        View tab02 =  inflater.inflate(R.layout.tan02, null);
        View tab03 =  inflater.inflate(R.layout.tan03, null);
        View tab04 =  inflater.inflate(R.layout.tan04, null);

        mViews.add(tab01);
        mViews.add(tab02);
        mViews.add(tab03);
        mViews.add(tab04);

        mImageViews = new
 
 ImageView[mViews.size()];
        for (int  i= 0; i < mViews.size();i++){
            imageView = new ImageView(this);
            imageView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
            mImageViews[i] = imageView;
            if (i == 0) {
                mImageViews[i].setBackgroundResource(R.drawable.dot_focus);
            } else {
                mImageViews[i].setBackgroundResource(R.drawable.dot_blur);
            }
//            輪播框架id 例項化group
// 在group框架中新增view，i就是圓點。
            mDot.addView(mImageViews[i]);
        }



        mViewPager.setAdapter(new mPagerAdapter(mViews));
        mViewPager.setOnPageChangeListener(new PageChangeListener());


    }


    /**滑動監聽器*/
    private class PageChangeListener implements ViewPager.OnPageChangeListener {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        }

        /**滑動完成後呼叫*/
        @Override
        public void onPageSelected(int position) {
            for (int i=0; i < mImageViews.length; i++){
                mImageViews[i].setBackgroundResource(R.drawable.dot_focus);
                if (position != i){
                    mImageViews[i].setBackgroundResource(R.drawable.dot_blur);
                }
            }
        }
        @Override
        public void onPageScrollStateChanged(int state) {
        }
    }

    private class mPagerAdapter extends PagerAdapter {


        private List<View> views = null;
        public mPagerAdapter(List<View> mViews) {
            this.views = mViews;
        }

        /**銷燬Item*/
        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            ((ViewPager) container).removeView(views.get(position));
        }

        /**初始化Item*/
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            View view = mViews.get(position);
            container.addView(view);
            return view;
        }
        /**有多少個頁面*/
        @Override
        public int getCount() {
            return mViews.size();
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }
    }
}