Java 片段上的BottomNavigationView
我使用底部导航视图,在一个片段上它不能正常工作问题是没有转换它只显示第一个选定的Java 片段上的BottomNavigationView,java,android,android-fragments,bottomnavigationview,Java,Android,Android Fragments,Bottomnavigationview,我使用底部导航视图,在一个片段上它不能正常工作问题是没有转换它只显示第一个选定的 navigationView.setSelectedItemId(R.id.message_menu_Friend); 我的代码 公共类MessageFragment扩展了片段{ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle saved
navigationView.setSelectedItemId(R.id.message_menu_Friend);
我的代码
公共类MessageFragment扩展了片段{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView =inflater.inflate(R.layout.fragment_message, container, false);
BottomNavigationView navigationView = rootView.findViewById(R.id.top_navigation_bar);
navigationView.setOnNavigationItemSelectedListener(topNav);
navigationView.setSelectedItemId(R.id.message_menu_Friend);
getChildFragmentManager().beginTransaction().replace(R.id.hostFragment_M,new FriendFragment()).commit();
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_message, container, false);
}
private BottomNavigationView.OnNavigationItemSelectedListener topNav = new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
Fragment selectedItem = null;
switch (item.getItemId()) {
case R.id.message_menu_message:
selectedItem = new MessagesFragment();
break;
case R.id.message_menu_Friend:
selectedItem = new FriendFragment();
break;
}
assert selectedItem != null;
getChildFragmentManager().beginTransaction().replace(R.id.hostFragment_M,selectedItem).commit();
return true ;
}
};}
Xml文件
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".MessageFragment">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout android:layout_marginTop="112dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/hostFragment_M">
</FrameLayout>
<EditText
android:id="@+id/editTextTextPersonSearch"
android:layout_width="match_parent"
android:layout_height="56dp"
android:background="@color/White"
android:backgroundTint="@color/White"
android:drawableEnd="@drawable/ic_baseline_search_24"
android:drawablePadding="8dp"
android:ems="10"
android:hint="@string/search"
android:inputType="textPersonName"
android:paddingStart="15dp"
android:paddingEnd="15dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/top_navigation_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/White"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editTextTextPersonSearch"
app:menu="@menu/message_menu"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
</FrameLayout>
当我单击底部导航时,如何使其显示片段?删除行
navigationView.setSelectedItemId(R.id.message_menu_Friend);
,并将getChildFragmentManager()
更改为getSupportFragmentManager()
。另外,在onCreate方法中,只需返回根视图,而不是再次膨胀。谢谢,当我只返回根视图而不是再次膨胀时,它可以工作。我不能在片段中使用getSupportFragmentManager,所以我必须使用getChildFragmentManager,我需要导航视图。setSelectedItemId(R.id.message\u菜单\u Friend);要告诉它更新您的答案需要什么时间,请再次感谢您,很高兴我能帮助您!