如何解决片段上的BottomNavigationView
我使用底部导航视图,并且在某个片段上无法正常工作,问题是没有过渡,仅显示第一个选定的对象
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,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>
当我点击底部导航栏时,如何显示片段
解决方法
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rootView
而不是再次膨胀即可。
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