<?xml version="1.0" encoding="utf-8"?>

<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"

    tools:context="com.cqytjr.www.cheji.Activity.BigImageActivity">

    <android.support.v4.view.ViewPager

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:id="@+id/viewpager">

    </android.support.v4.view.ViewPager>

    <LinearLayout

        android:layout_width="wrap_content"

        android:layout_height="40dp"

        android:id="@+id/ll_pager_num"

        android:orientation="horizontal"

        android:layout_alignParentBottom="true"

        android:layout_marginBottom="45dp"

        android:layout_centerHorizontal="true"

        >

    </LinearLayout>

</RelativeLayout>

public class BigImageActivity extends BaseActivity {

    private ViewPager pager;

    private List <ImageView>list;

    private LinearLayout mNumLayout;

    private List<Button>pagerList;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_big_image);

        initView();

    }

    @Override

    protected void initView() {

        super.initView();

        initWithData();

        mNumLayout = (LinearLayout) findViewById(R.id.ll_pager_num);

        pagerList = new ArrayList<Button>();

        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_page_indicator);

        for (int i = 0; i < list.size(); i++) {

            Button bt = new Button(this);

            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));

           //为小圆点左右添加间距

            params.leftMargin = 10;

            params.rightMargin = 10;

            //手动给小圆点一个大小

            params.height = bitmap.getWidth();

            params.width = bitmap.getHeight();

//            bt.setLayoutParams(new ViewGroup.LayoutParams(bitmap.getWidth(),bitmap.getHeight()));

//            bt.setBackgroundResource(R.drawable.ic_page_indicator);

            mNumLayout.addView(bt,params);

            pagerList.add(bt);

        }

        pager = (ViewPager)findViewById(R.id.viewpager);

        PagerAdapter adapter = new PagerAdapter() {

            @Override

            public int getCount() {

                return list.size();

            }

            @Override

            public boolean isViewFromObject(View view, Object object) {

                return view == object;

            }

            @Override

            public Object instantiateItem(ViewGroup container, int position)

            {

                container.addView(list.get(position));

                return list.get(position);

            }

            @Override

            public void destroyItem(ViewGroup container, int position,

                                    Object object)

            {

                container.removeView(list.get(position));

            }

        };

        pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override

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

            }

            @Override

            public void onPageSelected(int position) {

                choseItem(position);

            }

            @Override

            public void onPageScrollStateChanged(int state) {

            }

        });

        pager.setAdapter(adapter);

        pager.setCurrentItem(0);

        choseItem(0);

    }

    public void initWithData(){

        int[]strings = {R.drawable.ic_test_0,R.drawable.ic_test_1,R.drawable.ic_test_2,

                R.drawable.ic_test_3,R.drawable.ic_test_4,R.drawable.ic_test_5,R.drawable.ic_test_6};

        list = new ArrayList<ImageView>();

        for (int i=0;i<strings.length;i++){

            ImageView imageView = new ImageView(getApplicationContext());

            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);

            imageView.setImageResource(strings[i]);

            list.add(imageView);

        }

    }

    private void choseItem(int i){

        Log.d("BigImageActivity",i+"===========");

        for (Button button:pagerList){

            button.setBackgroundResource(R.drawable.ic_page_indicator);

        }

        Button button = pagerList.get(i);

        button.setBackgroundResource(R.drawable.ic_page_indicator_focused);

    }

}