Android 从导航栏中选择元素会冻结加载

Question

我有一个底部导航栏，其中包含多个元素，这些元素将我发送到不同的片段。

bottomNavigationView.setOnNavigationItemSelectedListener
(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
Fragment selectedFragment = null;
switch (item.getItemId()) {
case R.id.navigation_pokemon_description:
selectedFragment = PokemonDescriptionFragment.newInstance(MainActivity.getSelectedPokemon().get_id());
break;
case R.id.navigation_pokemon_evolutions:
selectedFragment = PokemonEvolutionsFragment.newInstance();
break;
case R.id.navigation_pokemon_moves:
selectedFragment = PokemonMovesFragment.newInstance();
break;
case R.id.navigation_pokemon_breeding:
selectedFragment = PokemonBreedingTrainingFragment.newInstance();
break;
case R.id.navigation_pokemon_location:
selectedFragment = PokemonLocationFragment.newInstance();
break;
}
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frame_layout, selectedFragment);
transaction.commit();
return true;
}
});

除了 Moves 片段外，所有片段都可以正常工作，当我按下它时，加载数据并显示片段大约需要 3 秒。

我想先显示片段，然后，加载移动并在加载数据时显示进度条或类似的东西。

这是我的片段：

public class PokemonMovesFragment extends Fragment {

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
databaseAccess = DatabaseAccess.getInstance(getContext());
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_pokemon_moves, container, false);
this.view=view;
initalizeAllComponents();
initializePokemonData();
initializePostDataPopulationComponents();
getActivity().setTitle(getResources().getText(R.string.moves)+ " (" +selectedPokemon.getName() + ")");
return view;
}
//The rest of the methods

Answer 1

只需将所有逻辑移动到onViewCreated内，然后在逻辑之前显示进度条，并在逻辑后隐藏进度条

@Override
public View onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState)
progressBar.visibility = View.VISIBLE; // Show Progress bar here
initalizeAllComponents();
initializePokemonData();
initializePostDataPopulationComponents();
getActivity().setTitle(getResources().getText(R.string.moves)+ " (" +selectedPokemon.getName() + ")");
progressBar.visibility = View.INVISIBLE; // Hide Progress bar here
}