带有导航组件的 BottomNavigationView - 选定的片段未显示
BottomNavigationView with navigation component - selected fragment not showing
我目前正在迁移到 android 导航组件，当在 BottomNavigationView 中 select 编辑新项目时，无法使片段转换正常工作。我按照官方文档中的说明进行操作，但没有发现 selected 片段未显示的任何问题。
在 onCreate 方法的 activity 中设置导航控制器：
NavController navController = Navigation.findNavController(this, R.id.fragment_main_layout_nav_host);
NavigationUI.setupActionBarWithNavController(this, navController);
NavigationUI.setupWithNavController(binding.includedAppbarMain.bottomNavigationViewMainAppbar, navController);
布局包含导航主机片段和 BottomNavigationView：
<fragment
android:id="@+id/fragment_main_layout_nav_host"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="androidx.navigation.fragment.NavHostFragment"
app:navGraph="@navigation/activity_main"
app:defaultNavHost="true"/>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottom_navigation_view_main_appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:menu="@menu/activity_main_bottom_navigation" />
BottomNavigationView 的菜单：
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/action_activity_main_home"
android:title="Home"
android:enabled="true"
android:icon="@drawable/ic_home_24dp"/>
<item
android:id="@+id/action_activity_main_notebooks"
android:title="Notebooks"
android:enabled="true"
android:icon="@drawable/ic_file_24dp"/>
<item
android:id="@+id/action_activity_main_search"
android:title="Search"
android:enabled="true"
android:icon="@drawable/ic_search_24dp"/>
</menu>
导航：
<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/activity_main"
app:startDestination="@id/action_activity_main_home">
<fragment
android:id="@+id/action_activity_main_home"
android:name="com.inknotes.view.fragment.MainHomeFragment"
android:label="@string/main_vertical_navigation_home"
tools:layout="@layout/fragment_main_home" />
<fragment
android:id="@+id/action_activity_main_notebooks"
android:name="com.inknotes.view.fragment.MainNotebookFragment"
android:label="@string/main_vertical_navigation_notebooks"
tools:layout="@layout/fragment_main_notebook" />
<fragment
android:id="@+id/action_activity_main_search"
android:name="com.inknotes.view.fragment.MainSearchFragment"
android:label="@string/main_vertical_navigation_search"
tools:layout="@layout/fragment_main_search" />
</navigation>
菜单项和片段的 ID 也匹配，我 运行 不明白为什么当我 select BottomNavigationView 中的另一个项目时没有显示新片段。
编辑 1：
我做了一些更多的测试，发现从后台弹出片段也不起作用，也许我的导航控制器有一些一般性问题？
编辑 2：
MainActivity（我删除了一些东西，因为它太长了）：
@MainActivityScope
public class MainActivity extends AppCompatActivity implements ComponentCallbacks2, MainActivityHandler,
SpeedDialView.OnActionSelectedListener, BottomNavigationView.OnNavigationItemSelectedListener {
// Static variables
public static final String EXTRA_PATH = "com.inknotes.EXTRA_PATH";
// Injected objects
@Inject MainHomeFragment mainHomeFragment;
@Inject MainFolderFragment mainFolderFragment;
@Inject MainNotebookFragment mainNotebookFragment;
@Inject MainSearchFragment mainSearchFragment;
@Inject MainFolderAddDialog mainFolderAddDialog;
@Inject MainNotebookAddDialog mainNotebookAddDialog;
@Inject MainNotebookActionModeCallback mainNotebookActionModeCallback;
@Inject MainFolderActionModeCallback mainFolderActionModeCallback;
@Inject FileHelper fileHelper;
@Inject ClipboardHelper clipboardHelper;
@Inject ViewModelProvider.Factory viewModelFactory;
@Inject MainVerticalNavigationAdapter mainVerticalNavigationAdapter;
@Inject XmlParser<OptionItem> xmlParser;
// Objects
public MainActivityComponent daggerMainActivityComponent;
private ActivityMainBinding binding;
private MainViewModel mainViewModel;
private MainFolderViewModel mainFolderViewModel;
private MainNotebookViewModel mainNotebookViewModel;
private GestureDetectorCompat gestureDetectorCompat;
private MenuItem searchMenuItem;
private SelectionTracker<Long> verticalNavigationSelectionTracker;
private NavController navController;
// Variables
private boolean isBackPressed = false;
// =============================================================================================
//region Base methods
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = DataBindingUtil.setContentView(
this,
R.layout.activity_main,
new BindingComponent(this));
binding.setLifecycleOwner(this);
// Set the main dagger component
daggerMainActivityComponent = ((InkNotesApplication) getApplication())
.component()
.mainActivityComponentFactory()
.create(this);
daggerMainActivityComponent.inject(this);
// Get all viewModels
mainViewModel = new ViewModelProvider(this, viewModelFactory).get(MainViewModel.class);
mainFolderViewModel = new ViewModelProvider(this, viewModelFactory).get(MainFolderViewModel.class);
mainNotebookViewModel = new ViewModelProvider(this, viewModelFactory).get(MainNotebookViewModel.class);
// Set the default file
mainViewModel.setDefaultFile(getExternalFilesDir("notes"));
mainViewModel.setCurrentFile(getExternalFilesDir("notes"));
gestureDetectorCompat = new GestureDetectorCompat(this, new GestureListener());
// Set variables of binding
binding.setHandler(this);
binding.setViewModel(mainViewModel);
// Setup main toolbar
setSupportActionBar(binding.includedAppbarMain.materialToolbarMainAppbar);
Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(false);
getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_menu_24dp);
// Setup explorer toolbar
binding.includedAppbarFolder.materialToolbarFolder.setOnMenuItemClickListener(this::onOptionsItemSelected);
// Setup drawer and navigation layout
binding.navigationViewMainFolder.setVisibility(View.GONE);
if (binding.drawerLayoutMain != null) {
binding.drawerLayoutMain.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
binding.drawerLayoutMain.addDrawerListener(new DrawerLayout.SimpleDrawerListener() {
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {
if (mainFolderActionModeCallback != null) {
mainFolderActionModeCallback.finish();
}
}
});
}
// Setup navigation
navController = Navigation.findNavController(this, R.id.fragment_main_layout_nav_host);
AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(
navController.getGraph()
).build();
NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
if (binding.includedAppbarMain.bottomNavigationViewMainAppbar != null) {
NavigationUI.setupWithNavController(binding.includedAppbarMain.bottomNavigationViewMainAppbar, navController);
}
// Set the explorer and file card fragment
/*
getSupportFragmentManager().beginTransaction()
.replace(R.id.frame_layout_main_layout_fragment_container, mainHomeFragment).commit();*/
getSupportFragmentManager().beginTransaction()
.replace(R.id.frame_layout_main_folder_container, mainFolderFragment).commit();
// Setup the floating action button
binding.includedAppbarMain.speedDialViewMainAppbar.inflate(R.menu.activity_main_fab);
binding.includedAppbarMain.speedDialViewMainAppbar.setOnActionSelectedListener(this);
// Setup bottom navigation view
if (binding.includedAppbarMain.bottomNavigationViewMainAppbar != null) {
binding.includedAppbarMain.bottomNavigationViewMainAppbar.setOnNavigationItemSelectedListener(this);
}
// Setup the vertical navigation view
if (binding.recyclerViewMainVerticalNavigation != null) {
binding.recyclerViewMainVerticalNavigation.setAdapter(mainVerticalNavigationAdapter);
List<OptionItem> items = xmlParser.parse(getResources().getXml(R.xml.menu_main_vertical_navigation), OptionItem.class);
// Create the selection tracker
// Add observer to the selection tracker
mainVerticalNavigationAdapter.setSelectionTracker(verticalNavigationSelectionTracker);
verticalNavigationSelectionTracker.select((long) R.id.action_activity_main_vertical_navigation_home);
mainVerticalNavigationAdapter.submitList(items);
binding.includedAppbarMain.speedDialViewMainAppbar.setVisibility(View.INVISIBLE);
toggleFolderNavigationView(View.VISIBLE);
}
}
@Override
public void onBackPressed() {
if (binding.drawerLayoutMain != null) {
if (binding.drawerLayoutMain.isDrawerOpen(GravityCompat.START)) {
binding.drawerLayoutMain.closeDrawer(GravityCompat.START);
}
}
super.onBackPressed();
}
@Override
public boolean onSupportNavigateUp() {
if (binding.drawerLayoutMain != null) {
return NavigationUI.navigateUp(navController, binding.drawerLayoutMain);
}
return super.onSupportNavigateUp();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
gestureDetectorCompat.onTouchEvent(event);
return super.onTouchEvent(event);
}
@Override
public boolean dispatchTouchEvent(@NonNull MotionEvent event) {
super.dispatchTouchEvent(event);
return gestureDetectorCompat.onTouchEvent(event);
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
selectNavigationItem(item.getItemId());
return true;
}
//endregion
// =============================================================================================
//region Custom methods
private void selectNavigationItem(int id) {
switch (id) {
case R.id.action_activity_main_home:
case R.id.action_activity_main_vertical_navigation_home:
//navController.navigate(R.id.action_activity_main_home);
if (binding.drawerLayoutMain != null) {
binding.drawerLayoutMain.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
}
Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(false);
if (searchMenuItem != null) {
searchMenuItem.collapseActionView();
}
binding.includedAppbarMain.appBarLayoutMainAppbar.setExpanded(true);
binding.includedAppbarMain.speedDialViewMainAppbar.setVisibility(View.INVISIBLE);
toggleFolderNavigationView(View.VISIBLE);
break;
case R.id.action_activity_main_notebooks:
case R.id.action_activity_main_vertical_navigation_notebooks:
//navController.navigate(R.id.action_activity_main_notebooks);
if (binding.drawerLayoutMain != null) {
binding.drawerLayoutMain.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
}
Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(true);
if (searchMenuItem != null) {
searchMenuItem.collapseActionView();
}
binding.includedAppbarMain.appBarLayoutMainAppbar.setExpanded(true);
binding.includedAppbarMain.speedDialViewMainAppbar.setVisibility(View.VISIBLE);
toggleFolderNavigationView(View.GONE);
break;
case R.id.action_activity_main_search:
case R.id.action_activity_main_vertical_navigation_search:
//navController.navigate(R.id.action_activity_main_search);
if (binding.drawerLayoutMain != null) {
binding.drawerLayoutMain.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
}
Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(false);
if (searchMenuItem != null) {
searchMenuItem.expandActionView();
}
binding.includedAppbarMain.appBarLayoutMainAppbar.setExpanded(false);
binding.includedAppbarMain.speedDialViewMainAppbar.setVisibility(View.INVISIBLE);
toggleFolderNavigationView(View.VISIBLE);
break;
}
isBackPressed = false;
}
在 selectNavigationItem 方法中，您还可以看到我测试了使用 navController.navigate(R.id.action_activity_main_notebooks); 手动导航，该方法有效但弹出后台堆栈也无效。但是用 NavigationUI.setupWithNavController(binding.includedAppbarMain.bottomNavigationViewMainAppbar, navController); 设置 BottomNavigationView 应该不需要调用 navigate.
主页片段：
@MainActivityScope
public class MainHomeFragment extends Fragment {
public final static String NAME = "MainHomeFragment";
@Inject
public MainHomeFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_main_home, container, false);
}
}
笔记本片段：
@MainActivityScope
public class MainNotebookFragment extends Fragment {
// Static variables
public final static String NAME = "MainNotebookFragment";
private static final String ARG_COLUMN_COUNT = "column-count";
// Injected objects
@Inject ViewModelProvider.Factory viewModelFactory;
@Inject MainNotebookAdapter mainNotebookAdapter;
@Inject MainNotebookItemTouchHelperCallback mainNotebookItemTouchHelperCallback;
// Objects
private RecyclerView recyclerView;
private MainNotebookViewModel mainNotebookViewModel;
// Variables
private int columnCount = 4;
@Inject
public MainNotebookFragment() {
}
// =============================================================================================
//region Base methods
@Override
public void onCreate(Bundle savedInstanceState) {
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
columnCount = getResources().getInteger(R.integer.column_count_portrait);
} else if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
columnCount = getResources().getInteger(R.integer.column_count_landscape);
}
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_main_notebook, container, false);
((MainActivity) requireActivity()).daggerMainActivityComponent.inject(this);
mainNotebookViewModel = new ViewModelProvider(requireActivity(), viewModelFactory).get(MainNotebookViewModel.class);
if (getArguments() != null) {
columnCount = getArguments().getInt(ARG_COLUMN_COUNT);
}
// Set the mainNotebookAdapter
if (view instanceof RecyclerView) {
Context context = view.getContext();
recyclerView = (RecyclerView) view;
if (columnCount <= 1) {
recyclerView.setLayoutManager(new LinearLayoutManager(context));
} else {
recyclerView.setLayoutManager(new GridLayoutManager(context, columnCount));
}
recyclerView.setAdapter(mainNotebookAdapter);
}
// Set the item touch helper
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(mainNotebookItemTouchHelperCallback);
itemTouchHelper.attachToRecyclerView(recyclerView);
return view;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mainNotebookViewModel.getItems().observe(
getViewLifecycleOwner(),
fileCardItems -> mainNotebookAdapter.setItems(fileCardItems)
);
mainNotebookViewModel.getSelectedItems().observe(
getViewLifecycleOwner(),
selectedExplorerItems -> mainNotebookAdapter.setSelectedItems(selectedExplorerItems)
);
mainNotebookViewModel.getQueryText().observe(
getViewLifecycleOwner(),
queryText -> mainNotebookAdapter.getFilter().filter(queryText)
);
}
@Override
public void onResume() {
super.onResume();
if (!EventBus.getDefault().isRegistered(mainNotebookAdapter)) {
EventBus.getDefault().register(mainNotebookAdapter);
}
}
@Override
public void onPause() {
super.onPause();
EventBus.getDefault().unregister(mainNotebookAdapter);
}
//endregion
}
搜索片段：
@MainActivityScope
public class MainSearchFragment extends Fragment {
public final static String NAME = "MainSearchFragment";
@Inject
public MainSearchFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_main_search, container, false);
}
}
如官方文档所述-
NavController manages app navigation within a NavHost.
Apps will generally obtain a controller directly from a host, or by
using one of the utility methods on the Navigation class rather than
create a controller directly.
当您创建 navController 时，请确保为其分配导航宿主片段的 ID。这就是您创建 navController 的方式。
NavController navController = Navigation.findNavController(this, R.id.fragment_main_layout);
// issue here, use R.id.fragment_main_layout_nav_host
而您 xml 中导航主机片段的 ID 是 -
<fragment>
android:id="@+id/fragment_main_layout_nav_host"
.....
</fragment>
确保您使用相同的 ID。
编码愉快!!
您在初始化 NavController
时使用了错误的主机片段 ID
你需要更换
NavController navController = Navigation.findNavController(this, R.id.fragment_main_layout);
与
NavController navController = Navigation.findNavController(this, R.id.fragment_main_layout_nav_host);
``你初始化BottomNavigationView了吗
BottomNavigationView bottomNavigationView =binding.bottomNavigationAppBar
并在
中调用bottomNavigationView
NavigationUI.setupWithNavController(bottomNavigationView,
navController);
我终于找到了解决方案，问题出在 onNavigationItemSelected 函数上。因此，从 MainActivity 中删除这两个部分可以解决问题：
if (binding.includedAppbarMain.bottomNavigationViewMainAppbar != null) {
binding.includedAppbarMain.bottomNavigationViewMainAppbar.setOnNavigationItemSelectedListener(this);
}
...
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
selectNavigationItem(item.getItemId());
return true;
}
或者我所做的，因为我仍然需要函数，return NavigationUI.onNavDestinationSelected(item, navController) 而不是 true。
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
selectNavigationItem(item.getItemId());
return NavigationUI.onNavDestinationSelected(item, navController);
}
终于解决了我的问题，
当我使用导航图时，底部导航组件会发生许多片段和操作，其中只有 5 个菜单可用。
my issue was when i am visit any menu then it show active stag but
when i visit twise which is already visit then no active stag show ..
Means that no active color showing after navigating fragment.
已使用此解决方案修复：-
app:popUpTo="@id/homeFragment"
app:popUpToInclusive="true"
<fragment
android:id="@+id/addAccountFragment"
android:name="app.ph7.doctor.ui.screens.home.addAccount.AddAccountFragment"
android:label="AddAccountFragment"
tools:layout="@layout/fragment_add_account">
<action
android:id="@+id/action_addAccountFragment_to_accDetailsFragment"
app:destination="@id/accDetailsFragment" />
<action
android:id="@+id/action_addAccountFragment_to_notificationFragment"
app:destination="@id/notificationFragment" />
<action
android:id="@+id/action_addAccountFragment_to_appointmentFragment"
app:destination="@id/appointmentFragment"
app:popUpTo="@id/homeFragment"
app:popUpToInclusive="true" />
</fragment>
Here homefragment is startDestination
<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/dashboard_navigation"
app:startDestination="@id/homeFragment">
希望您的问题得到解决..
我目前正在迁移到 android 导航组件，当在 BottomNavigationView 中 select 编辑新项目时，无法使片段转换正常工作。我按照官方文档中的说明进行操作，但没有发现 selected 片段未显示的任何问题。
在 onCreate 方法的 activity 中设置导航控制器：
NavController navController = Navigation.findNavController(this, R.id.fragment_main_layout_nav_host);
NavigationUI.setupActionBarWithNavController(this, navController);
NavigationUI.setupWithNavController(binding.includedAppbarMain.bottomNavigationViewMainAppbar, navController);
布局包含导航主机片段和 BottomNavigationView：
<fragment
android:id="@+id/fragment_main_layout_nav_host"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="androidx.navigation.fragment.NavHostFragment"
app:navGraph="@navigation/activity_main"
app:defaultNavHost="true"/>
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottom_navigation_view_main_appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:menu="@menu/activity_main_bottom_navigation" />
BottomNavigationView 的菜单：
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/action_activity_main_home"
android:title="Home"
android:enabled="true"
android:icon="@drawable/ic_home_24dp"/>
<item
android:id="@+id/action_activity_main_notebooks"
android:title="Notebooks"
android:enabled="true"
android:icon="@drawable/ic_file_24dp"/>
<item
android:id="@+id/action_activity_main_search"
android:title="Search"
android:enabled="true"
android:icon="@drawable/ic_search_24dp"/>
</menu>
导航：
<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/activity_main"
app:startDestination="@id/action_activity_main_home">
<fragment
android:id="@+id/action_activity_main_home"
android:name="com.inknotes.view.fragment.MainHomeFragment"
android:label="@string/main_vertical_navigation_home"
tools:layout="@layout/fragment_main_home" />
<fragment
android:id="@+id/action_activity_main_notebooks"
android:name="com.inknotes.view.fragment.MainNotebookFragment"
android:label="@string/main_vertical_navigation_notebooks"
tools:layout="@layout/fragment_main_notebook" />
<fragment
android:id="@+id/action_activity_main_search"
android:name="com.inknotes.view.fragment.MainSearchFragment"
android:label="@string/main_vertical_navigation_search"
tools:layout="@layout/fragment_main_search" />
</navigation>
菜单项和片段的 ID 也匹配，我 运行 不明白为什么当我 select BottomNavigationView 中的另一个项目时没有显示新片段。
编辑 1：
我做了一些更多的测试，发现从后台弹出片段也不起作用，也许我的导航控制器有一些一般性问题？
编辑 2：
MainActivity（我删除了一些东西，因为它太长了）：
@MainActivityScope
public class MainActivity extends AppCompatActivity implements ComponentCallbacks2, MainActivityHandler,
SpeedDialView.OnActionSelectedListener, BottomNavigationView.OnNavigationItemSelectedListener {
// Static variables
public static final String EXTRA_PATH = "com.inknotes.EXTRA_PATH";
// Injected objects
@Inject MainHomeFragment mainHomeFragment;
@Inject MainFolderFragment mainFolderFragment;
@Inject MainNotebookFragment mainNotebookFragment;
@Inject MainSearchFragment mainSearchFragment;
@Inject MainFolderAddDialog mainFolderAddDialog;
@Inject MainNotebookAddDialog mainNotebookAddDialog;
@Inject MainNotebookActionModeCallback mainNotebookActionModeCallback;
@Inject MainFolderActionModeCallback mainFolderActionModeCallback;
@Inject FileHelper fileHelper;
@Inject ClipboardHelper clipboardHelper;
@Inject ViewModelProvider.Factory viewModelFactory;
@Inject MainVerticalNavigationAdapter mainVerticalNavigationAdapter;
@Inject XmlParser<OptionItem> xmlParser;
// Objects
public MainActivityComponent daggerMainActivityComponent;
private ActivityMainBinding binding;
private MainViewModel mainViewModel;
private MainFolderViewModel mainFolderViewModel;
private MainNotebookViewModel mainNotebookViewModel;
private GestureDetectorCompat gestureDetectorCompat;
private MenuItem searchMenuItem;
private SelectionTracker<Long> verticalNavigationSelectionTracker;
private NavController navController;
// Variables
private boolean isBackPressed = false;
// =============================================================================================
//region Base methods
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = DataBindingUtil.setContentView(
this,
R.layout.activity_main,
new BindingComponent(this));
binding.setLifecycleOwner(this);
// Set the main dagger component
daggerMainActivityComponent = ((InkNotesApplication) getApplication())
.component()
.mainActivityComponentFactory()
.create(this);
daggerMainActivityComponent.inject(this);
// Get all viewModels
mainViewModel = new ViewModelProvider(this, viewModelFactory).get(MainViewModel.class);
mainFolderViewModel = new ViewModelProvider(this, viewModelFactory).get(MainFolderViewModel.class);
mainNotebookViewModel = new ViewModelProvider(this, viewModelFactory).get(MainNotebookViewModel.class);
// Set the default file
mainViewModel.setDefaultFile(getExternalFilesDir("notes"));
mainViewModel.setCurrentFile(getExternalFilesDir("notes"));
gestureDetectorCompat = new GestureDetectorCompat(this, new GestureListener());
// Set variables of binding
binding.setHandler(this);
binding.setViewModel(mainViewModel);
// Setup main toolbar
setSupportActionBar(binding.includedAppbarMain.materialToolbarMainAppbar);
Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(false);
getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_menu_24dp);
// Setup explorer toolbar
binding.includedAppbarFolder.materialToolbarFolder.setOnMenuItemClickListener(this::onOptionsItemSelected);
// Setup drawer and navigation layout
binding.navigationViewMainFolder.setVisibility(View.GONE);
if (binding.drawerLayoutMain != null) {
binding.drawerLayoutMain.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
binding.drawerLayoutMain.addDrawerListener(new DrawerLayout.SimpleDrawerListener() {
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {
if (mainFolderActionModeCallback != null) {
mainFolderActionModeCallback.finish();
}
}
});
}
// Setup navigation
navController = Navigation.findNavController(this, R.id.fragment_main_layout_nav_host);
AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(
navController.getGraph()
).build();
NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
if (binding.includedAppbarMain.bottomNavigationViewMainAppbar != null) {
NavigationUI.setupWithNavController(binding.includedAppbarMain.bottomNavigationViewMainAppbar, navController);
}
// Set the explorer and file card fragment
/*
getSupportFragmentManager().beginTransaction()
.replace(R.id.frame_layout_main_layout_fragment_container, mainHomeFragment).commit();*/
getSupportFragmentManager().beginTransaction()
.replace(R.id.frame_layout_main_folder_container, mainFolderFragment).commit();
// Setup the floating action button
binding.includedAppbarMain.speedDialViewMainAppbar.inflate(R.menu.activity_main_fab);
binding.includedAppbarMain.speedDialViewMainAppbar.setOnActionSelectedListener(this);
// Setup bottom navigation view
if (binding.includedAppbarMain.bottomNavigationViewMainAppbar != null) {
binding.includedAppbarMain.bottomNavigationViewMainAppbar.setOnNavigationItemSelectedListener(this);
}
// Setup the vertical navigation view
if (binding.recyclerViewMainVerticalNavigation != null) {
binding.recyclerViewMainVerticalNavigation.setAdapter(mainVerticalNavigationAdapter);
List<OptionItem> items = xmlParser.parse(getResources().getXml(R.xml.menu_main_vertical_navigation), OptionItem.class);
// Create the selection tracker
// Add observer to the selection tracker
mainVerticalNavigationAdapter.setSelectionTracker(verticalNavigationSelectionTracker);
verticalNavigationSelectionTracker.select((long) R.id.action_activity_main_vertical_navigation_home);
mainVerticalNavigationAdapter.submitList(items);
binding.includedAppbarMain.speedDialViewMainAppbar.setVisibility(View.INVISIBLE);
toggleFolderNavigationView(View.VISIBLE);
}
}
@Override
public void onBackPressed() {
if (binding.drawerLayoutMain != null) {
if (binding.drawerLayoutMain.isDrawerOpen(GravityCompat.START)) {
binding.drawerLayoutMain.closeDrawer(GravityCompat.START);
}
}
super.onBackPressed();
}
@Override
public boolean onSupportNavigateUp() {
if (binding.drawerLayoutMain != null) {
return NavigationUI.navigateUp(navController, binding.drawerLayoutMain);
}
return super.onSupportNavigateUp();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
gestureDetectorCompat.onTouchEvent(event);
return super.onTouchEvent(event);
}
@Override
public boolean dispatchTouchEvent(@NonNull MotionEvent event) {
super.dispatchTouchEvent(event);
return gestureDetectorCompat.onTouchEvent(event);
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
selectNavigationItem(item.getItemId());
return true;
}
//endregion
// =============================================================================================
//region Custom methods
private void selectNavigationItem(int id) {
switch (id) {
case R.id.action_activity_main_home:
case R.id.action_activity_main_vertical_navigation_home:
//navController.navigate(R.id.action_activity_main_home);
if (binding.drawerLayoutMain != null) {
binding.drawerLayoutMain.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
}
Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(false);
if (searchMenuItem != null) {
searchMenuItem.collapseActionView();
}
binding.includedAppbarMain.appBarLayoutMainAppbar.setExpanded(true);
binding.includedAppbarMain.speedDialViewMainAppbar.setVisibility(View.INVISIBLE);
toggleFolderNavigationView(View.VISIBLE);
break;
case R.id.action_activity_main_notebooks:
case R.id.action_activity_main_vertical_navigation_notebooks:
//navController.navigate(R.id.action_activity_main_notebooks);
if (binding.drawerLayoutMain != null) {
binding.drawerLayoutMain.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
}
Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(true);
if (searchMenuItem != null) {
searchMenuItem.collapseActionView();
}
binding.includedAppbarMain.appBarLayoutMainAppbar.setExpanded(true);
binding.includedAppbarMain.speedDialViewMainAppbar.setVisibility(View.VISIBLE);
toggleFolderNavigationView(View.GONE);
break;
case R.id.action_activity_main_search:
case R.id.action_activity_main_vertical_navigation_search:
//navController.navigate(R.id.action_activity_main_search);
if (binding.drawerLayoutMain != null) {
binding.drawerLayoutMain.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
}
Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(false);
if (searchMenuItem != null) {
searchMenuItem.expandActionView();
}
binding.includedAppbarMain.appBarLayoutMainAppbar.setExpanded(false);
binding.includedAppbarMain.speedDialViewMainAppbar.setVisibility(View.INVISIBLE);
toggleFolderNavigationView(View.VISIBLE);
break;
}
isBackPressed = false;
}
在 selectNavigationItem 方法中，您还可以看到我测试了使用 navController.navigate(R.id.action_activity_main_notebooks); 手动导航，该方法有效但弹出后台堆栈也无效。但是用 NavigationUI.setupWithNavController(binding.includedAppbarMain.bottomNavigationViewMainAppbar, navController); 设置 BottomNavigationView 应该不需要调用 navigate.
主页片段：
@MainActivityScope
public class MainHomeFragment extends Fragment {
public final static String NAME = "MainHomeFragment";
@Inject
public MainHomeFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_main_home, container, false);
}
}
笔记本片段：
@MainActivityScope
public class MainNotebookFragment extends Fragment {
// Static variables
public final static String NAME = "MainNotebookFragment";
private static final String ARG_COLUMN_COUNT = "column-count";
// Injected objects
@Inject ViewModelProvider.Factory viewModelFactory;
@Inject MainNotebookAdapter mainNotebookAdapter;
@Inject MainNotebookItemTouchHelperCallback mainNotebookItemTouchHelperCallback;
// Objects
private RecyclerView recyclerView;
private MainNotebookViewModel mainNotebookViewModel;
// Variables
private int columnCount = 4;
@Inject
public MainNotebookFragment() {
}
// =============================================================================================
//region Base methods
@Override
public void onCreate(Bundle savedInstanceState) {
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
columnCount = getResources().getInteger(R.integer.column_count_portrait);
} else if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
columnCount = getResources().getInteger(R.integer.column_count_landscape);
}
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_main_notebook, container, false);
((MainActivity) requireActivity()).daggerMainActivityComponent.inject(this);
mainNotebookViewModel = new ViewModelProvider(requireActivity(), viewModelFactory).get(MainNotebookViewModel.class);
if (getArguments() != null) {
columnCount = getArguments().getInt(ARG_COLUMN_COUNT);
}
// Set the mainNotebookAdapter
if (view instanceof RecyclerView) {
Context context = view.getContext();
recyclerView = (RecyclerView) view;
if (columnCount <= 1) {
recyclerView.setLayoutManager(new LinearLayoutManager(context));
} else {
recyclerView.setLayoutManager(new GridLayoutManager(context, columnCount));
}
recyclerView.setAdapter(mainNotebookAdapter);
}
// Set the item touch helper
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(mainNotebookItemTouchHelperCallback);
itemTouchHelper.attachToRecyclerView(recyclerView);
return view;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mainNotebookViewModel.getItems().observe(
getViewLifecycleOwner(),
fileCardItems -> mainNotebookAdapter.setItems(fileCardItems)
);
mainNotebookViewModel.getSelectedItems().observe(
getViewLifecycleOwner(),
selectedExplorerItems -> mainNotebookAdapter.setSelectedItems(selectedExplorerItems)
);
mainNotebookViewModel.getQueryText().observe(
getViewLifecycleOwner(),
queryText -> mainNotebookAdapter.getFilter().filter(queryText)
);
}
@Override
public void onResume() {
super.onResume();
if (!EventBus.getDefault().isRegistered(mainNotebookAdapter)) {
EventBus.getDefault().register(mainNotebookAdapter);
}
}
@Override
public void onPause() {
super.onPause();
EventBus.getDefault().unregister(mainNotebookAdapter);
}
//endregion
}
搜索片段：
@MainActivityScope
public class MainSearchFragment extends Fragment {
public final static String NAME = "MainSearchFragment";
@Inject
public MainSearchFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_main_search, container, false);
}
}
如官方文档所述-
NavController manages app navigation within a NavHost.
Apps will generally obtain a controller directly from a host, or by using one of the utility methods on the Navigation class rather than create a controller directly.
当您创建 navController 时，请确保为其分配导航宿主片段的 ID。这就是您创建 navController 的方式。
NavController navController = Navigation.findNavController(this, R.id.fragment_main_layout);
// issue here, use R.id.fragment_main_layout_nav_host
而您 xml 中导航主机片段的 ID 是 -
<fragment>
android:id="@+id/fragment_main_layout_nav_host"
.....
</fragment>
确保您使用相同的 ID。
编码愉快!!
您在初始化 NavController
你需要更换
NavController navController = Navigation.findNavController(this, R.id.fragment_main_layout);
与
NavController navController = Navigation.findNavController(this, R.id.fragment_main_layout_nav_host);
``你初始化BottomNavigationView了吗
BottomNavigationView bottomNavigationView =binding.bottomNavigationAppBar
并在
中调用bottomNavigationViewNavigationUI.setupWithNavController(bottomNavigationView,
navController);
我终于找到了解决方案，问题出在 onNavigationItemSelected 函数上。因此，从 MainActivity 中删除这两个部分可以解决问题：
if (binding.includedAppbarMain.bottomNavigationViewMainAppbar != null) {
binding.includedAppbarMain.bottomNavigationViewMainAppbar.setOnNavigationItemSelectedListener(this);
}
...
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
selectNavigationItem(item.getItemId());
return true;
}
或者我所做的，因为我仍然需要函数，return NavigationUI.onNavDestinationSelected(item, navController) 而不是 true。
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
selectNavigationItem(item.getItemId());
return NavigationUI.onNavDestinationSelected(item, navController);
}
终于解决了我的问题， 当我使用导航图时，底部导航组件会发生许多片段和操作，其中只有 5 个菜单可用。
my issue was when i am visit any menu then it show active stag but when i visit twise which is already visit then no active stag show .. Means that no active color showing after navigating fragment.
已使用此解决方案修复：-
app:popUpTo="@id/homeFragment" app:popUpToInclusive="true"
<fragment
android:id="@+id/addAccountFragment"
android:name="app.ph7.doctor.ui.screens.home.addAccount.AddAccountFragment"
android:label="AddAccountFragment"
tools:layout="@layout/fragment_add_account">
<action
android:id="@+id/action_addAccountFragment_to_accDetailsFragment"
app:destination="@id/accDetailsFragment" />
<action
android:id="@+id/action_addAccountFragment_to_notificationFragment"
app:destination="@id/notificationFragment" />
<action
android:id="@+id/action_addAccountFragment_to_appointmentFragment"
app:destination="@id/appointmentFragment"
app:popUpTo="@id/homeFragment"
app:popUpToInclusive="true" />
</fragment>
Here homefragment is startDestination
<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/dashboard_navigation"
app:startDestination="@id/homeFragment">
希望您的问题得到解决..