第一步MainActivity布局XML

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/main_rel"
    >
    <androidx.viewpager.widget.ViewPager
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/splace_vp"
        />
    <TextView
        android:layout_width="@dimen/dp_10"
        android:layout_height="@dimen/dp_10"
        android:background="@drawable/pop_hei_kuang"
        android:layout_alignParentBottom="true"
        android:layout_marginLeft="@dimen/dp_160"
        android:layout_marginBottom="@dimen/dp_100"
        android:id="@+id/splace_text1"
        />
    <TextView
        android:layout_width="@dimen/dp_10"
        android:layout_height="@dimen/dp_10"
        android:background="@drawable/pop_hei_kuang"
        android:layout_alignParentBottom="true"
        android:layout_marginLeft="@dimen/dp_180"
        android:layout_marginBottom="@dimen/dp_100"
        android:id="@+id/splace_text2"
        />
    <TextView
        android:layout_width="@dimen/dp_10"
        android:layout_height="@dimen/dp_10"
        android:background="@drawable/pop_hei_kuang"
        android:layout_alignParentBottom="true"
        android:layout_marginLeft="@dimen/dp_200"
        android:layout_marginBottom="@dimen/dp_100"
        android:id="@+id/splace_text3"
        />
</RelativeLayout>

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle"
    >
    <stroke android:width="1dp" android:color="@color/black"/>
    <corners android:radius="@dimen/dp_720"/>
</shape>

第二步Activity详解

private void initShouYe() {

        View view1 = View.inflate(this, R.layout.activity_viewpage_buju1, null);
        View view2 = View.inflate(this, R.layout.activity_viewpage_buju2, null);
        View view3 = View.inflate(this, R.layout.activity_viewpage_buju3, null);

        ArrayList<View> views = new ArrayList<>();
        views.add(view1);
        views.add(view2);
        views.add(view3);
        button = view3.findViewById(R.id.buju3_btn);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                timerTask.cancel();
                mMainRel.setVisibility(View.GONE);
            }
        });
        mSplaceVp.setAdapter(new PagerAdapter() {
            @Override
            public int getCount() {
                return views.size();
            }

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

            @NonNull
            @Override
            public Object instantiateItem(@NonNull ViewGroup container, int position) {
                View view = views.get(position);
                container.addView(view);
                return view;
            }

            @Override
            public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
                //super.destroyItem(container, position, object);
                container.removeView(views.get(position));
            }
        });
        final Boolean[] b = {false};
        mSplaceVp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @SuppressLint("ResourceAsColor")
            @Override
            public void onPageSelected(int position) {
                if (position == 0) {
                    mSplaceText1.setBackgroundColor(getResources().getColor(R.color.red));
                    mSplaceText1.setBackgroundColor(getResources().getColor(R.color.white));
                    mSplaceText1.setBackgroundColor(getResources().getColor(R.color.white));
                } else if (position == 1) {
mSplaceText1.setBackgroundColor(getResources().getColor(R.color.white)); mSplaceText1.setBackgroundColor(getResources().getColor(R.color.red));
mSplaceText1.setBackgroundColor(getResources().getColor(R.color.white));
                    if (b[0]){
                        timerTask.cancel();
                        button.setText(3+"s");
                        time = 2;
                    }
                } else if (position == 2) {
                    mSplaceText1.setBackgroundColor(getResources().getColor(R.color.white));                mSplaceText1.setBackgroundColor(getResources().getColor(R.color.white));                  mSplaceText1.setBackgroundColor(getResources().getColor(R.color.red));
                    b[0] = true;
                    timer = new Timer();
                    timerTask = new TimerTask() {
                        @Override
                        public void run() {
                            try {
                                Thread.sleep(1000);
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                            handler.sendEmptyMessage(time);
                        }
                    };
                    timer.schedule(timerTask, 1000, 1000);
                }
            }
            @Override
            public void onPageScrollStateChanged(int state) {
            }
        });
    }