问题描述
我遇到了问题。我无法制作工具栏来显示菜单。我知道这个问题以前曾在这里被问过,我经历了所有可能的解决方案,但没有一个给我想要的结果。所以我正在使用1个活动和几个片段,我想根据片段在工具栏中显示不同的菜单项。这是我的MainActivity.java
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.google.android.material.navigation.NavigationView;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.fragment.NavHostFragment;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener{
DrawerLayout drawerLayout;
NavigationView drawerView;
NavController navController;
AppBarConfiguration appBarConfiguration;
ConstraintLayout container;
Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
drawerLayout = findViewById(R.id.drawer_layout);
drawerView = findViewById(R.id.drawer_view);
toolbar = findViewById(R.id.toolbar);
BottomNavigationView navView = findViewById(R.id.nav_view);
container = findViewById(R.id.container);
drawerView.bringToFront();
NavHostFragment navHostFragment = (NavHostFragment) getSupportFragmentManager()
.findFragmentById(R.id.nav_host_fragment);
navController = navHostFragment.getNavController();
//NavController navController = Navigation.findNavController(this,R.id.nav_host_fragment);
appBarConfiguration = new AppBarConfiguration.Builder(R.id.navigation_main,R.id.navigation_favourite,R.id.navigation_add_announce,R.id.navigation_notifications,R.id.navigation_profile).setopenableLayout(drawerLayout).build();
NavigationUI.setupWithNavController(drawerView,navController);
NavigationUI.setupWithNavController(toolbar,navController,appBarConfiguration);
NavigationUI.setupWithNavController(navView,navController);
drawerView.setCheckedItem(R.id.drawer_main);
drawerView.setNavigationItemSelectedListener(this);
animateDrawer();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.profile_fragment_menu,menu);
return true;
}
@Override
public boolean onoptionsItemSelected(MenuItem item) {
navController = Navigation.findNavController(this,R.id.nav_host_fragment);
return NavigationUI.onNavDestinationSelected(item,navController)
|| super.onoptionsItemSelected(item);
}
我想在ProfileFragment工具栏中显示登录文本 ProfileFragment.java代码:
import androidx.appcompat.widget.Toolbar;
import androidx.fragment.app.FragmentManager;
import androidx.lifecycle.viewmodelProvider;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.navigation.fragment.NavHostFragment;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
public class ProfileFragment extends Fragment {
Profileviewmodel mviewmodel;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
setHasOptionsMenu(true);
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(@NonNull LayoutInflater inflater,@Nullable ViewGroup container,@Nullable Bundle savedInstanceState) {
mviewmodel = new viewmodelProvider(this).get(Profileviewmodel.class);
View root = inflater.inflate(R.layout.profile_fragment,container,false);
return root;
}
public void onCreateOptionsMenu (Menu menu,MenuInflater inflater){
inflater.inflate(R.menu.profile_fragment_menu,menu);
}
}
profile_fragment_menu.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/registerFragment"
android:title="@string/enter_acc"<!-- LogIn -->
app:showAsAction="always"/>
</menu>
mobile_navigation.xml保存导航图
<?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/navigation_main">
<fragment
android:id="@+id/navigation_main"
android:name=".ui.main.MainFragment"
android:label="@string/nav_bar_main"
tools:layout="@layout/main_fragment" />
<fragment
android:id="@+id/navigation_favourite"
android:name=".ui.favourite.FavouriteFragment"
android:label="@string/nav_bar_favourite"
tools:layout="@layout/favourite_fragment" />
<fragment
android:id="@+id/navigation_add_announce"
android:name=".ui.add.AddFragment"
android:label="@string/nav_bar_add_announce"
tools:layout="@layout/add_fragment" />
<fragment
android:id="@+id/navigation_notifications"
android:name=".ui.notifications.NotificationsFragment"
android:label="@string/nav_bar_notifications"
tools:layout="@layout/notifications_fragment" />
<fragment
android:id="@+id/navigation_profile"
android:name=".ui.profile.ProfileFragment"
android:label="@string/nav_bar_profile"
tools:layout="@layout/profile_fragment" >
<action
android:id="@+id/action_navigation_profile_to_registerFragment"
app:destination="@id/registerFragment" />
</fragment>
<fragment
android:id="@+id/registerFragment"
android:name=".ui.profile.register.RegisterFragment"
android:label="register_fragment"
tools:layout="@layout/register_fragment" />
</navigation>
我在onCreate方法的MainActivity中尝试过toolbar.inflateMenu(R.menu.profile_fragment_menu)
菜单项出现并可以单击,但在所有片段上均显示+ onoptionsItemSelected并未处理单击项。我的最后一次尝试可以在我的代码中看到。预先谢谢你
解决方法
如果要将Toolbar
用作ActionBar
并使用ActionBar
API(如onCreateOptionsMenu
),则必须添加setSupportActionBar(toolbar);
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
否则,如果您不调用setSupportActionBar
,则可以直接使用工具栏API,并在每个片段中使用方法inflateMenu()
。像这样:
toolbar.inflateMenu(R.menu.xxxxx)
,然后使用setOnMenuItemClickListener
方法设置clickListener。