以下是一个使用气泡标签指示器的自定义Android选项卡选中项的示例代码：

1. 在布局文件中添加TabLayout和ViewPager：

2. 创建一个自定义的TabLayout.OnTabSelectedListener：

public class MyTabSelectedListener implements TabLayout.OnTabSelectedListener {
    private Context context;
    private LayoutInflater inflater;

    public MyTabSelectedListener(Context context) {
        this.context = context;
        inflater = LayoutInflater.from(context);
    }

    @Override
    public void onTabSelected(TabLayout.Tab tab) {
        // 获取选中项的View
        View view = tab.getCustomView();
        TextView textView = view.findViewById(R.id.tabText);
        ImageView imageView = view.findViewById(R.id.tabIcon);

        // 修改选中项的样式
        textView.setTextColor(ContextCompat.getColor(context, R.color.colorAccent));
        imageView.setColorFilter(ContextCompat.getColor(context, R.color.colorAccent));
    }

    @Override
    public void onTabUnselected(TabLayout.Tab tab) {
        // 获取未选中项的View
        View view = tab.getCustomView();
        TextView textView = view.findViewById(R.id.tabText);
        ImageView imageView = view.findViewById(R.id.tabIcon);

        // 修改未选中项的样式
        textView.setTextColor(ContextCompat.getColor(context, R.color.colorPrimaryDark));
        imageView.setColorFilter(ContextCompat.getColor(context, R.color.colorPrimaryDark));
    }

    @Override
    public void onTabReselected(TabLayout.Tab tab) {

    }
}

3. 在Activity中设置TabLayout和ViewPager：

public class MainActivity extends AppCompatActivity {
    private TabLayout tabLayout;
    private ViewPager viewPager;

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

        tabLayout = findViewById(R.id.tabLayout);
        viewPager = findViewById(R.id.viewPager);

        // 设置ViewPager的适配器
        MyPagerAdapter adapter = new MyPagerAdapter(getSupportFragmentManager());
        viewPager.setAdapter(adapter);

        // 将TabLayout与ViewPager关联起来
        tabLayout.setupWithViewPager(viewPager);

        // 设置自定义的TabLayout.OnTabSelectedListener
        MyTabSelectedListener tabSelectedListener = new MyTabSelectedListener(this);
        tabLayout.addOnTabSelectedListener(tabSelectedListener);

        // 设置选项卡的自定义布局
        for (int i = 0; i < tabLayout.getTabCount(); i++) {
            TabLayout.Tab tab = tabLayout.getTabAt(i);
            tab.setCustomView(adapter.getTabView(i));
        }
    }
}

4. 创建一个自定义的PagerAdapter：

public class MyPagerAdapter extends FragmentPagerAdapter {
    private String[] tabTitles = {"Tab 1", "Tab 2", "Tab 3"};

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

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

    @Override
    public int getCount() {
        return tabTitles.length;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return tabTitles[position];
    }

    public View getTabView(int position) {
        View view = LayoutInflater.from(context).inflate(R.layout.custom_tab_layout, null);
        TextView tabText = view.findViewById(R.id.tabText);
        ImageView tabIcon = view.findViewById(R.id.tabIcon);

        tabText.setText(tabTitles[position]);
        tabIcon.setImageResource(R.drawable.ic_tab);

        return view;
    }
}

5. 创建一个自定义的Fragment：

public class MyFragment extends Fragment {
    private static final String ARG_TITLE = "title";
    private String title;

    public MyFragment() {
        // Required empty public constructor
    }

    public static MyFragment newInstance(String title) {
        MyFragment fragment = new MyFragment();
        Bundle args = new Bundle();
        args.putString(ARG_TITLE, title);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            title = getArguments().getString(ARG_TITLE);
        }