CODEWITHSUNDEEP
androidandroid-fragmentsandroid-tablayout
Avii
Avii

Reputation: 33

TabLayout tabs getting destroyed on switching tabs

I am using tab layout in my activity which has two tabs. When i switch to another tab current tab fragment is destroyed, and another tab is created from scratch ( from Oncreate() lifecycle method) hoverver I went once before.

private void Tablayout_TabSelected(object sender, TabSelectedEventArgs e)
    {
        Tab tab = e.Tab;
        if (tab.Position == 0)
        {
            SupportFragmentManager.BeginTransaction().Replace(Resource.Id.fragmentContainerView, listFrag ??= new MusicListFragment(), "ListFrag").Commit();
        }
        else if (tab.Position == 1)
        {
            SupportFragmentManager.BeginTransaction().Replace(Resource.Id.fragmentContainerView, favFrag ??= new FavoriteSongsFragment(), "FavFrag").Commit();
        }
    }

is, isn't it a good idea to keep the whole fragment in memory instead of creating a new one every time?

Or How can i improve my switching ?

Upvotes: 0

Views: 433

Answers (1)

Praveen Kumar
Praveen Kumar

Reputation: 339

Try this

Use FragmentPagerAdapter it is easy and work well method

  1. Create class extend FragmentPagerAdapter

  2. follow the below code in your adapter

    public class FragmentAdapter extends FragmentPagerAdapter {
    Context context;
    int totalTaps;

  public FragmentAdapter(@NonNull FragmentManager fm, Context context, int totalTaps) {
    super(fm);
    this.context = context;
    this.totalTaps = totalTaps;
}

@NonNull
@Override
public Fragment getItem(int position) {

    switch (position){
        case 0:
            MusicListFragment musicListFragment= new MusicListFragment();
            return musicListFragment;
        case 1:
            FavoriteSongsFragment favoriteSongsFragment= new FavoriteSongsFragment();
            return favoriteSongsFragment;

        default:
            return null;
    }
}

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

MainActivity

public class HomePage extends AppCompatActivity {

ViewPager viewPager;
TabLayout tabLayout;
FragmentAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home_page);
    viewPager = findViewById(R.id.viewPager);
    tabLayout = findViewById(R.id.tabLayout);
    adapter = new FragmentAdapter(getSupportFragmentManager(),getApplicationContext(),2);

    tabLayout.addTab(tabLayout.newTab().setText("ListFrag"));
    tabLayout.addTab(tabLayout.newTab().setText("FavFrag"));

     viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
     tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
         @Override
         public void onTabSelected(TabLayout.Tab tab) {
             viewPager.setCurrentItem(tab.getPosition());
         }

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

         }

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

         }
     });
     viewPager.setAdapter(adapter);
}

Upvotes: 2

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