使用ViewPager在Activity中更改片段中视图的属性

// 在Activity的布局文件中添加ViewPager控件
<androidx.viewpager.widget.ViewPager
    android:id="@+id/viewPager"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

// 在Activity的Java代码中设置ViewPager和FragmentPagerAdapter
ViewPager viewPager = findViewById(R.id.viewPager);
MyPagerAdapter pagerAdapter = new MyPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(pagerAdapter);

// 创建FragmentPagerAdapter的子类
private class MyPagerAdapter extends FragmentPagerAdapter {
    private static final int NUM_PAGES = 3;

    public MyPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        return MyFragment.newInstance(position);
    }

    @Override
    public int getCount() {
        return NUM_PAGES;
    }
}

// 在Fragment的Java代码中获取视图实例并更改属性
public class MyFragment extends Fragment {
    private static final String ARG_POSITION = "position";
    private int position;

    public static MyFragment newInstance(int position) {
        MyFragment fragment = new MyFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_POSITION, position);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        position = getArguments().getInt(ARG_POSITION);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_layout, container, false);
        TextView textView = view.findViewById(R.id.textView);
        // 根据位置设置不同的文本内容
        if (position == 0) {
            textView.setText("Fragment 1");
        } else if (position == 1) {
            textView.setText("Fragment 2");
        } else if (position == 2) {
            textView.setText("Fragment 3");
        }
        return view;
    }
}

// 在Activity的Java代码中监听ViewPager的页面切换事件
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    }

    @Override
    public void onPageSelected(int position) {
        // 获取当前显示的Fragment实例
        MyFragment fragment = (MyFragment) pagerAdapter.getItem(position);
        // 调用Fragment实例中的方法，更改需要更改的视图属性
        fragment.updateView();
    }

    @Override
    public void onPageScrollStateChanged(int state) {
    }
});

// 在Fragment的Java代码中添加更新视图的方法
public void updateView() {
    // 更新视图的属性
    // ...
}