從活動向上導航到片段打開相同的片段-Android導航組件-有解無憂

在這個應用程式上，當我嘗試從"HomeFragment"到"DetailsActivity"然后按回時，它又回到了同一個片段，而且點擊時的漢堡包圖示也不起作用

來源：imgur.com

導航圖

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@ id/mobile_navigation"
    app:startDestination="@id/nav_home">

    <fragment
        android:id="@ id/nav_home"
        android:name="com.blogspot.abtallaldigital.ui.home.HomeFragment"
        android:label="@string/home"
        tools:layout="@layout/fragment_home"/>

    <fragment
        android:id="@ id/nav_Accessory"
        android:name="com.blogspot.abtallaldigital.ui.accessory.AccessoryFragment"
        android:label="@string/accessory"
        tools:layout="@layout/fragment_accessory" />

    <fragment
        android:id="@ id/nav_Arcade"
        android:name="com.blogspot.abtallaldigital.ui.arcade.ArcadeFragment"
        android:label="@string/arcade"
        tools:layout="@layout/fragment_arcade" />

    <fragment
        android:id="@ id/nav_Fashion"
        android:name="com.blogspot.abtallaldigital.ui.fashion.FashionFragment"
        android:label="@string/fashion"
        tools:layout="@layout/fashion_fragment" />
    <fragment
        android:id="@ id/nav_Food"
        android:name="com.blogspot.abtallaldigital.ui.food.FoodFragment"
        android:label="@string/food"
        tools:layout="@layout/food_fragment" />
    <fragment
        android:id="@ id/nav_Heath"
        android:name="com.blogspot.abtallaldigital.ui.heath.HeathFragment"
        android:label="@string/heath"
        tools:layout="@layout/heath_fragment" />
    <fragment
        android:id="@ id/nav_Lifestyle"
        android:name="com.blogspot.abtallaldigital.ui.lifestyle.LifestyleFragment"
        android:label="@string/lifestyle"
        tools:layout="@layout/lifestyle_fragment" />
    <fragment
        android:id="@ id/nav_Sports"
        android:name="com.blogspot.abtallaldigital.ui.sports.SportsFragment"
        android:label="@string/sports"
        tools:layout="@layout/sports_fragment" />
    <dialog
        android:id="@ id/about"
        android:name="com.blogspot.abtallaldigital.ui.about.AboutFragment"
        android:label="about"
        tools:layout="@layout/about" />
    <activity
        android:id="@ id/detailsActivity"
        android:name="com.blogspot.abtallaldigital.ui.DetailsActivity"
        android:label="activity_details"
        tools:layout="@layout/activity_details" />
</navigation>

HomeFragment導航代碼

@Override
    public void onViewCreated(@NonNull @NotNull View view, @Nullable @org.jetbrains.annotations.Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        binding.homeRecyclerView.addOnItemTouchListener(new RecyclerItemClickListener(requireContext(),
                binding.homeRecyclerView, new RecyclerItemClickListener.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {

                Item item = itemArrayList.get(position);
                bundle.putParcelable("item",item);

                Navigation.findNavController(requireView())
                        .navigate(R.id.detailsActivity, bundle,
                                new NavOptions.Builder()
                                        .setPopUpTo(R.id.nav_home, true).build()
                        );

            }

            @Override
            public void onLongItemClick(View view, int position) {

            }
        }
        ));
    }

詳情活動

@AndroidEntryPoint
public class DetailsActivity extends AppCompatActivity {

    private static final String TAG = "DetailsActivity";
    private ActivityDetailsBinding binding;

    String url, title, content, youtubeThumbnailImageSrc, youTubeLink;
    int youtubeThumbnailImageSetVisibility;
    private PostViewModel postViewModel;
    private Item postItem;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivityDetailsBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        postViewModel = new ViewModelProvider(this).get(PostViewModel.class);


        postItem = getIntent().getParcelableExtra("item");


        if (postItem != null) {

            Log.d(TAG, "onItemClick: item"   postItem.getTitle());

            final Document document = Jsoup.parse(postItem.getContent());
//                    final Elements elements = document.select("img");


            Element element = document.body();

            for (Element e : element.getElementsByClass
                    ("YOUTUBE-iframe-video")) {
                youtubeThumbnailImageSrc = e.attr("data-thumbnail-src");
                youTubeLink = e.attr("src");
                Log.e("YouTube thumbnail", youtubeThumbnailImageSrc);
                Log.e("Youtube link", youTubeLink);
            }

            if (youtubeThumbnailImageSrc == null) {
                youtubeThumbnailImageSetVisibility = 8;
            }

            url = postItem.getUrl();
            title = postItem.getTitle();
            content = postItem.getContent();


        }


//        blogImage = (ImageView) findViewById(R.id.blogImage);

        setSupportActionBar(binding.toolbar);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);

        binding.progressBar.setVisibility(View.VISIBLE);

        binding.titleTextView.setText(title);
        binding.blogContent.setMovementMethod(LinkMovementMethod.getInstance());


        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            binding.fab.bringToFront();
        }

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            binding.scrollView.setOnScrollChangeListener((v, scrollX, scrollY, oldScrollX, oldScrollY) -> {
                //   Log.d("ScrollView","scrollX_" scrollX "_scrollY_" scrollY "_oldScrollX_" oldScrollX "_oldScrollY_" oldScrollY);
                if (scrollY > 0 && binding.fab.isShown()) {
                    binding.fab.hide();
                } else if (scrollY < 22) {
                    binding.fab.show();

                }
            });
        } else {
            binding.scrollView.getViewTreeObserver().addOnScrollChangedListener(() -> {
                int mScrollY = binding.scrollView.getScrollY();
                if (mScrollY > 0 && binding.fab.isShown()) {
                    binding.fab.hide();
                } else if (mScrollY < 22) {
                    binding.fab.show();
                }
            });
        }


        binding.fab.setOnClickListener(view -> {
            String shareContent = title   "\n"   url;
            Intent shareIntent = new Intent(Intent.ACTION_SEND);
            shareIntent.setType("text/plain");
            shareIntent.putExtra(Intent.EXTRA_TEXT, shareContent);
            shareIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);

            try {
                startActivity(Intent.createChooser(shareIntent, title));
            } catch (Exception exception) {
                Log.e(TAG, "onCreate: "   exception);
            }
        });


        //       String imageSrc = getIntent().getStringExtra("blogImage");
        //       Glide.with(getApplicationContext()).load(imageSrc).into(blogImage);


        binding.youtubeThumbnailImage.setVisibility(youtubeThumbnailImageSetVisibility);
        binding.youtubeThumbnailImage.setAdjustViewBounds(true);
        Picasso.get().load(youtubeThumbnailImageSrc).into(binding.youtubeThumbnailImage);

        binding.youtubeThumbnailImage.setOnClickListener(view -> {
            Intent youTube = new Intent
                    (Intent.ACTION_VIEW, Uri.parse(youTubeLink));
            startActivity(youTube);
        });


        PicassoImageGetter imageGetter = new PicassoImageGetter(binding.blogContent, this);
        Spannable html;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            html = (Spannable) Html.fromHtml(content, Html.FROM_HTML_MODE_LEGACY, imageGetter, null);
        } else {
            html = (Spannable) Html.fromHtml(content, imageGetter, null);
        }

        binding.blogContent.setText(html);


        binding.visitSite.setOnClickListener(view -> openCustomTab(this, Uri.parse(url)));
        binding.progressBar.setVisibility(View.GONE);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_details_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        if (item.getItemId() == R.id.action_add_to_favorites) {
            saveTogFavorites(item);
        } else if (item.getItemId() == R.id.action_share) {
            ShareActionProvider shareActionProvider =
                    (ShareActionProvider) MenuItemCompat.getActionProvider(item);
            shareActionProvider.setShareIntent(createShareIntent());
            return true;
        } else if (item.getItemId() == R.id.copyTheLink) {
            ClipboardManager clipboardManager = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
            ClipData clipData = ClipData.newPlainText("link", url);
            clipboardManager.setPrimaryClip(clipData);
            Toast.makeText(this, getString(R.string.linkCopied), Toast.LENGTH_LONG).show();
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private void saveTogFavorites(MenuItem menuItem) {

//        Bundle bundle = getIntent().getParcelableExtra("postList");


        FavoritesEntity favoritesEntity = new FavoritesEntity(0,
                postItem);

        postViewModel.insertFavorites(favoritesEntity);
        menuItem.setIcon(R.drawable.ic_favorite);

        Snackbar.make(binding.getRoot(), "Saved", Snackbar.LENGTH_LONG).show();


    }

    @Override
    public boolean onSupportNavigateUp() {
        onBackPressed();
        return true;
    }

主要活動


@AndroidEntryPoint
public class MainActivity extends AppCompatActivity {

    @SuppressWarnings("unused")
    private AppBarConfiguration mAppBarConfiguration;
    public static Utils.DataStoreRepository DATA_STORE_REPOSITORY;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActivityMainBinding binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        DATA_STORE_REPOSITORY = new Utils.DataStoreRepository(this);

        setSupportActionBar(binding.appBarMain.toolbar);
        mAppBarConfiguration = new AppBarConfiguration.Builder(R.id.nav_home, R.id.nav_Accessory,
                R.id.nav_Arcade, R.id.nav_Fashion,
                R.id.nav_Food, R.id.nav_Heath,
                R.id.nav_Lifestyle, R.id.nav_Sports, R.id.about)
                .setOpenableLayout(binding.drawerLayout)
                .build();


        NavHostFragment navHostFragment = (NavHostFragment)
                getSupportFragmentManager().findFragmentById(R.id.nav_host_fragment);

        assert navHostFragment != null;
        NavController navController = navHostFragment.getNavController();

        NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
        NavigationUI.setupWithNavController(binding.navView, navController);


    }


    @Override
    public boolean onSupportNavigateUp() {
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        return NavigationUI.navigateUp(navController, mAppBarConfiguration)
                || super.onSupportNavigateUp();
    }

}

在尋找這個問題的解決方案時，我看到了類似的問題，我使用 viewModel with MutableLiveDatabut not to handle the events

uj5u.com熱心網友回復：

為什么要創建另一個 Activity？

導航組件的默認行為是使用一個 Activity 和多個 Fragment。

您應該創建一個配接器來在專案上顯示這些資料，然后在 ItemClickListener 介面上實作以將選定的專案從配接器單擊到 HomeFragment。從 HomeFragment 您可以實作介面并將當前單擊的專案發送到 DetailsFragment 而不是 DetailsActivity（您必須更改），您可以使用引數發送它。

不要在導航組件中使用多個活動。

uj5u.com熱心網友回復：

試試這個解決方案

創建新片段DetailsFragment并將您的代碼移動DetailsActivity到它，
不要覆寫onSupportNavigateUp

public class DetailsFragment extends Fragment {

    private static final String TAG = "DetailsFragment";

    private FragmentDetailsBinding binding;

    String url, title, content, youtubeThumbnailImageSrc, youTubeLink;
    int youtubeThumbnailImageSetVisibility;
    private PostViewModel postViewModel;

    @Override
    public void onViewCreated(@NonNull @NotNull View view, @Nullable @org.jetbrains.annotations.Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        postViewModel = new ViewModelProvider(this).get(PostViewModel.class);
        Log.d(TAG, "onCreate checkSavedFavoritesItems: "   postFavoritesSavedId);


        postItem = DetailsFragmentArgs.fromBundle(getArguments()).getPostItem();


        final Document document = Jsoup.parse(postItem.getContent());
//                    final Elements elements = document.select("img");

        Element element = document.body();

        for (Element e : element.getElementsByClass
                ("YOUTUBE-iframe-video")) {
            youtubeThumbnailImageSrc = e.attr("data-thumbnail-src");
            youTubeLink = e.attr("src");
            Log.e("YouTube thumbnail", youtubeThumbnailImageSrc);
            Log.e("Youtube link", youTubeLink);
        }

        if (youtubeThumbnailImageSrc == null) {
            youtubeThumbnailImageSetVisibility = 8;
        }

        url = postItem.getUrl();
        title = postItem.getTitle();
        content = postItem.getContent();


        //        blogImage = (ImageView) findViewById(R.id.blogImage);

        setHasOptionsMenu(true);
//        Objects.requireNonNull(getSupportActionBar()).setDisplayShowTitleEnabled(false);
        Objects.requireNonNull( ((MainActivity) requireActivity())
                .getSupportActionBar()).setDisplayHomeAsUpEnabled(true);
//        getSupportActionBar().setDisplayShowHomeEnabled(true);

        binding.progressBar.setVisibility(View.VISIBLE);

        binding.titleTextView.setText(title);
        binding.blogContent.setMovementMethod(LinkMovementMethod.getInstance());


        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            binding.fab.bringToFront();
        }

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            binding.scrollView.setOnScrollChangeListener((v, scrollX, scrollY, oldScrollX, oldScrollY) -> {
                //   Log.d("ScrollView","scrollX_" scrollX "_scrollY_" scrollY "_oldScrollX_" oldScrollX "_oldScrollY_" oldScrollY);
                if (scrollY > 0 && binding.fab.isShown()) {
                    binding.fab.hide();
                } else if (scrollY < 22) {
                    binding.fab.show();

                }
            });
        } else {
            binding.scrollView.getViewTreeObserver().addOnScrollChangedListener(() -> {
                int mScrollY = binding.scrollView.getScrollY();
                if (mScrollY > 0 && binding.fab.isShown()) {
                    binding.fab.hide();
                } else if (mScrollY < 22) {
                    binding.fab.show();
                }
            });
        }


        binding.fab.setOnClickListener(view2 -> {
            String shareContent = title   "\n"   url;
            Intent shareIntent = new Intent(Intent.ACTION_SEND);
            shareIntent.setType("text/plain");
            shareIntent.putExtra(Intent.EXTRA_TEXT, shareContent);
            shareIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);

            try {
                startActivity(Intent.createChooser(shareIntent, title));
            } catch (Exception exception) {
                Log.e(TAG, "onCreate: "   exception);
            }
        });


        //       String imageSrc = getIntent().getStringExtra("blogImage");
        //       Glide.with(getApplicationContext()).load(imageSrc).into(blogImage);


        binding.youtubeThumbnailImage.setVisibility(youtubeThumbnailImageSetVisibility);
        binding.youtubeThumbnailImage.setAdjustViewBounds(true);
        Picasso.get().load(youtubeThumbnailImageSrc).into(binding.youtubeThumbnailImage);

        binding.youtubeThumbnailImage.setOnClickListener(view1 -> {
            Intent youTube = new Intent
                    (Intent.ACTION_VIEW, Uri.parse(youTubeLink));
            startActivity(youTube);
        });


        PicassoImageGetter imageGetter = new PicassoImageGetter(binding.blogContent, requireContext());
        Spannable html;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            html = (Spannable) Html.fromHtml(content, Html.FROM_HTML_MODE_LEGACY, imageGetter, null);
        } else {
            html = (Spannable) Html.fromHtml(content, imageGetter, null);
        }

        binding.blogContent.setText(html);


        binding.visitSite.setOnClickListener(view3 -> openCustomTab(requireContext(), Uri.parse(url)));
        binding.progressBar.setVisibility(View.GONE);
    }

    private Item postItem;
    private boolean postFavoritesSaved = false;
    private int postFavoritesSavedId = 0;
    private MenuItem menuItem;

    @Override
    public View onCreateView(@NotNull LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        binding =  FragmentDetailsBinding.inflate(inflater, container, false);
        return binding.getRoot();
    }


    @Override
    public void onCreateOptionsMenu(@NonNull Menu menu,
                                    @NonNull MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        inflater.inflate(R.menu.activity_details_menu, menu);
        menuItem = menu.findItem(R.id.action_add_to_favorites);
        checkSavedFavoritesItems(menuItem);
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        menuItem.setIcon(R.drawable.ic_favorite_border);
    }

    private void checkSavedFavoritesItems(MenuItem menuItem) {
        postViewModel.getAllFavorites().observe(this, favoritesEntity -> {
            try {
                for (FavoritesEntity savedPost: favoritesEntity) {
                    if (savedPost.getItem().getId().equals(postItem.getId())) {
                        menuItem.setIcon(R.drawable.ic_favorite);
                        postFavoritesSavedId = savedPost.getId();
                        Log.d(TAG, "checkSavedFavoritesItems: "   postFavoritesSavedId);
                        postFavoritesSaved = true;
                    }
                }
            } catch (Exception exception) {
                Log.e(TAG, "checkSavedFavoritesItems: "   exception.getMessage());
            }
        });
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem menuItem) {

        if (menuItem.getItemId() == R.id.action_add_to_favorites && !postFavoritesSaved) {
            saveTogFavorites(menuItem);
        } else if (menuItem.getItemId() == R.id.action_add_to_favorites && postFavoritesSaved) {
            removePostFromFavorites(menuItem);
        } else if (menuItem.getItemId() == R.id.action_share) {
            ShareActionProvider shareActionProvider =
                    (ShareActionProvider) MenuItemCompat.getActionProvider(menuItem);
            shareActionProvider.setShareIntent(createShareIntent());
            return true;
        } else if (menuItem.getItemId() == R.id.copyTheLink) {
            ClipboardManager clipboardManager = (ClipboardManager)
                    requireActivity().getSystemService(Context.CLIPBOARD_SERVICE);
            ClipData clipData = ClipData.newPlainText("link", url);
            assert clipboardManager != null;
            clipboardManager.setPrimaryClip(clipData);
            Toast.makeText(requireContext(), getString(R.string.linkCopied), Toast.LENGTH_LONG).show();
            return true;
        }

        return super.onOptionsItemSelected(menuItem);
    }

    private void saveTogFavorites(MenuItem menuItem) {
        FavoritesEntity favoritesEntity = new FavoritesEntity(0,
                postItem);

        postViewModel.insertFavorites(favoritesEntity);
        menuItem.setIcon(R.drawable.ic_favorite);
        Snackbar.make(binding.getRoot(), "Saved", Snackbar.LENGTH_LONG).show();
        postFavoritesSaved = true;
    }


    private void removePostFromFavorites(MenuItem menuItem) {
        FavoritesEntity favoritesEntity = new FavoritesEntity(postFavoritesSavedId,
                postItem);

        Log.d(TAG, "checkSavedFavoritesItems: "   postFavoritesSavedId);
        postViewModel.deleteFavoritePost(favoritesEntity);
        menuItem.setIcon(R.drawable.ic_favorite_border);
        Snackbar.make(binding.getRoot(),
                "Post deleted from favorites", Snackbar.LENGTH_LONG).show();
        postFavoritesSaved = false;
    }

添加DetailsFragment到nav_graph和將其添加引數postItem作為Parcelable

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@ id/mobile_navigation"
    app:startDestination="@id/nav_home">

    <fragment
        android:id="@ id/nav_home"
        android:name="com.blogspot.abtallaldigital.ui.home.HomeFragment"
        android:label="@string/home"
        tools:layout="@layout/fragment_home">
        <action
            android:id="@ id/action_nav_home_to_detailsFragment"
            app:destination="@id/detailsFragment"
            app:popUpTo="@id/nav_home" />
    </fragment>

    <fragment
        android:id="@ id/nav_Accessory"
        android:name="com.blogspot.abtallaldigital.ui.accessory.AccessoryFragment"
        android:label="@string/accessory"
        tools:layout="@layout/fragment_accessory" >
        <action
            android:id="@ id/action_nav_Accessory_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>

    <fragment
        android:id="@ id/nav_Arcade"
        android:name="com.blogspot.abtallaldigital.ui.arcade.ArcadeFragment"
        android:label="@string/arcade"
        tools:layout="@layout/fragment_arcade" >
        <action
            android:id="@ id/action_nav_Arcade_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>

    <fragment
        android:id="@ id/nav_Fashion"
        android:name="com.blogspot.abtallaldigital.ui.fashion.FashionFragment"
        android:label="@string/fashion"
        tools:layout="@layout/fashion_fragment" >
        <action
            android:id="@ id/action_nav_Fashion_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>
    <fragment
        android:id="@ id/nav_Food"
        android:name="com.blogspot.abtallaldigital.ui.food.FoodFragment"
        android:label="@string/food"
        tools:layout="@layout/food_fragment" >
        <action
            android:id="@ id/action_nav_Food_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>
    <fragment
        android:id="@ id/nav_Heath"
        android:name="com.blogspot.abtallaldigital.ui.heath.HeathFragment"
        android:label="@string/heath"
        tools:layout="@layout/heath_fragment" >
        <action
            android:id="@ id/action_nav_Heath_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>
    <fragment
        android:id="@ id/nav_Lifestyle"
        android:name="com.blogspot.abtallaldigital.ui.lifestyle.LifestyleFragment"
        android:label="@string/lifestyle"
        tools:layout="@layout/lifestyle_fragment" >
        <action
            android:id="@ id/action_nav_Lifestyle_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>
    <fragment
        android:id="@ id/nav_Sports"
        android:name="com.blogspot.abtallaldigital.ui.sports.SportsFragment"
        android:label="@string/sports"
        tools:layout="@layout/sports_fragment" >
        <action
            android:id="@ id/action_nav_Sports_to_detailsFragment"
            app:destination="@id/detailsFragment" />
    </fragment>
    <dialog
        android:id="@ id/about"
        android:name="com.blogspot.abtallaldigital.ui.about.AboutFragment"
        android:label="about"
        tools:layout="@layout/about" />
    <fragment
        android:id="@ id/detailsFragment"
        android:name="com.blogspot.abtallaldigital.ui.DetailsFragment"
        android:label="Post details"
        tools:layout="@layout/fragment_details" >
        <argument
            android:name="postItem"
            app:argType="com.blogspot.abtallaldigital.pojo.Item" />
    </fragment>
</navigation>

最后在 HomeFragment 中撰寫導航代碼，并像這樣傳遞可打包的專案

@Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        navController = Navigation.findNavController(requireView());

        binding.homeRecyclerView.addOnItemTouchListener(new RecyclerItemClickListener(requireContext(),
                binding.homeRecyclerView, new RecyclerItemClickListener.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {

                Item item = itemArrayList.get(position);

                if (Objects.requireNonNull(navController.getCurrentDestination()).getId() == R.id.nav_home) {
                    Navigation.findNavController(requireView())
                            .navigate(HomeFragmentDirections.actionNavHomeToDetailsFragment(item));
                }

            }

            @Override
            public void onLongItemClick(View view, int position) {

            }
        }
        ));
    }

關于工具列問題，您可以選擇使用片段自定義工具列或使用應用程式主題工具列，但不能同時使用，請讓我知道靈魂是否有效

uj5u.com熱心網友回復：

您可以嘗試從片段管理器中洗掉片段，如下所示：

Fragment fragmentByTag = getFragmentManager().
                    findFragmentByTag("Old fragment tag");
            if (fragmentByTag != null) {
                getFragmentManager().beginTransaction()
                        .remove(fragmentByTag).commit();
            }

轉載請註明出處，本文鏈接：https://www.uj5u.com/yidong/324304.html

標籤：爪哇安卓 android-fragments android-架构-导航片段回栈

上一篇：遍歷MySQL表的兩列

下一篇：如何在片段內制作微調器？