Android 滑动时选项卡名称消失

Question

I started a new project on Android Studio using Tabbed Activity. I did not change any code but what I observed is, when you swipe between the tabs then the name of the current active tab is not showing. I want the name to be shown up always. How can I do this?

I post the default code which is delivered automatically by Android Studio. I think the method getPageTitle is responsible for this.

import android.content.Context;

import androidx.annotation.Nullable;
import androidx.annotation.StringRes;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;

import com.example.customerservice.R;

/**
 * A [FragmentPagerAdapter] that returns a fragment corresponding to
 * one of the sections/tabs/pages.
 */
public class SectionsPagerAdapter extends FragmentPagerAdapter {

    @StringRes
    private static final int[] TAB_TITLES = new int[]{R.string.tab_text_1, R.string.tab_text_2, R.string.tab_text_3};
    private final Context mContext;

    public SectionsPagerAdapter(Context context, FragmentManager fm) {
        super(fm);
        mContext = context;
    }

    @Override
    public Fragment getItem(int position) {
        // getItem is called to instantiate the fragment for the given page.
        // Return a PlaceholderFragment (defined as a static inner class below).
        return PlaceholderFragment.newInstance(position + 1);
    }

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return mContext.getResources().getString(TAB_TITLES[position]);
    }

    @Override
    public int getCount() {
        // Show 2 total pages.
        return 3;
    }
}

Answer 1

Open a new project

choose "Tabbed Activity"

open "SectionsPagerAdapter" Java class:

Click on "Tab 1" and "Tab 2"

you can see that the names of Tabs are stored in String resources you can find it here:

then you can change it for example: Hello Tab 1 Hello Tab 2

This is the result:

Edited:

If you want to see all the tabs names at the same time, you can use "ViewPager2", read this documentation:

Create swipe views with tabs using ViewPager2

I hope this is helpful.