引导页的实现

正在练习的一个小项目，想在闪屏页结束后，实现一个可以左右滑动的引导页，用来介绍程序引导用户

private ViewPager mViewPager;
    //容器,将页卡添加进去
    private List mList = new ArrayList<>();
    //需要滑动的页卡
    private View view1, view2, view3;
    //小圆点
    private ImageView point1, point2, point3;
    //跳过
    private ImageView iv_back;

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

        initview();

    }

    //初始化view
    private void initview() {
        mViewPager = (ViewPager) findViewById(R.id.mViewPager);

        iv_back = (ImageView) findViewById(R.id.iv_back);
        iv_back.setOnClickListener(this);

        point1 = (ImageView) findViewById(R.id.point1);
        point2 = (ImageView) findViewById(R.id.point2);
        point3 = (ImageView) findViewById(R.id.point3);


        //监听viewpager滑动
        mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            //pager切换
            @Override
            public void onPageSelected(int position) {
            //根据当前的位置，显示相应的小圆点（底部）
                switch (position) {
                    case 0:
                        setPointImg(true, false, false);
                        iv_back.setVisibility(View.VISIBLE);
                        break;
                    case 1:
                        setPointImg(false, true, false);
                        iv_back.setVisibility(View.VISIBLE);
                        break;
                    case 2:
                        setPointImg(false, false, true);
                        iv_back.setVisibility(View.GONE);
                        break;
                }
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });


        view1 = View.inflate(this, R.layout.pager_item_one, null);
        view2 = View.inflate(this, R.layout.pager_item_two, null);
        view3 = View.inflate(this, R.layout.pager_item_three, null);

        view3.findViewById(R.id.btn_start).setOnClickListener(this);
        //滑动页卡添加进数组
        mList.add(view1);
        mList.add(view2);
        mList.add(view3);

        //设置适配器
        mViewPager.setAdapter(new GuideAdapter());
    }

    //设置小圆点的选中效果
    private void setPointImg(boolean isCheck1, boolean isCheck2, boolean isCheck3) {
        if (isCheck1) {
            point1.setBackgroundResource(R.drawable.point_on);
        } else {
            point1.setBackgroundResource(R.drawable.point_off);
        }
        if (isCheck2) {
            point2.setBackgroundResource(R.drawable.point_on);
        } else {
            point2.setBackgroundResource(R.drawable.point_off);
        }
        if (isCheck3) {
            point1.setBackgroundResource(R.drawable.point_on);
        } else {
            point3.setBackgroundResource(R.drawable.point_off);
        }

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_start:
            case R.id.iv_back:
                startActivity(new Intent(this, MainActivity.class));
                finish();
                break;
        }
    }

    class GuideAdapter extends PagerAdapter {
    //这里只用了我需要的，还有别的方法。
        @Override
        public int getCount() {
            return mList.size();
        }

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

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            ((ViewPager) container).addView(mList.get(position));
            return mList.get(position);
        }

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