找不到 id 的视图.(com.example..:id/notesFragment) for fragment Not

Question

我想在单击按钮后从活动切换到片段。单击按钮时应用程序崩溃并给出此错误

对于过渡，我写了它

btnSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FragmentTransaction fragmentTransaction= getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.notesFragment,new NotesFragment());
fragmentTransaction.commit();
}
});

fragment_notes.xml

我给id作为"noteFragment">

<?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=".Fragments.NotesFragment"
android:background="@color/mainDarkBlue"
android:id="@+id/notesFragment">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
app:fabSize="auto"
android:layout_margin="@dimen/fab_margin"
android:backgroundTint="@color/rossyBrown"
android:src="@drawable/ic_fab_add_note"
android:id="@+id/button_fab"/>
...
</androidx.coordinatorlayout.widget.CoordinatorLayout>  
</FrameLayout>

Answer 1

您需要传递父类 ID 来膨胀片段，而不是片段名称本身

btnSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FragmentTransaction fragmentTransaction= getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.parentLayoutId, new NotesFragment()); 
//Change R.id.notesFragment to your parent class main layout id
fragmentTransaction.commit();
}
});  

类似的东西

<LinearLayout 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"
android:orientation="vertical">
<Button
android:id="@+id/BtnRedirectFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Default Fragment" />

<!--  Frame Layout for placing Fragments  -->
<FrameLayout
android:id="@+id/fragmentContainer"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</LinearLayout>