片段不会在RecyclerView项上打开 [英] Fragment won't open on RecyclerView item click
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问题描述
该项目使用Navigation Drawer，RecyclerView和一个界面来检测对RecyclerView项的点击.
This project uses Navigation Drawer, RecyclerView and an Interface to detect the clicks on RecyclerView items.
问题是当我单击这些项目时，什么都没有发生. 我试图打开一个工作正常的活动.所以我认为界面没有问题.
Problem is when I click on the items nothing happens. I tried to open an activity that works fine. so i think there's no problem with the interface.
我发现了一些类似的问题如何打开其他片段在recyclerview OnClick上，但是它们都没有帮助解决此特定问题.
I found some similar questions how to open a different fragment on recyclerview OnClick but none of them helped to solve this specific problem.
我做错了什么?
HomeFragment.java
HomeFragment.java
public class HomeFragment extends Fragment implements MyAdapter.OnNoteListener {
RecyclerView recyclerView;
MyAdapter myAdapter;
LinkedList<Data_Items> data_items = new LinkedList<Data_Items>();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_home, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
recyclerView = view.findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
data_items.add(new Data_Items(R.drawable.a, "Pink", "This is a pink color"));
// .......... 10 more items
myAdapter = new MyAdapter(data_items, this);
recyclerView.setAdapter(myAdapter);
myAdapter.notifyDataSetChanged();
}
@Override
public void onNoteClick(int position) {
FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.layout_container, new BookmarkFragment());
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}}
fragment_home.xml
fragment_home.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".HomeFragment">
<FrameLayout
android:id="@+id/layout_container"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</FrameLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
BookmarkFragment.java
BookmarkFragment.java
public class BookmarkFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_bookmark, container, false);
}}
MyAdapter.java
MyAdapter.java
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
LinkedList<Data_Items> data_items;
private OnNoteListener mOnNoteListener;
public MyAdapter(LinkedList<Data_Items> data_items, OnNoteListener onNoteListener)
{
this.data_items = data_items;
this.mOnNoteListener = onNoteListener;
}
class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener
{
ImageView imageView;
TextView textView1;
TextView textView2;
OnNoteListener onNoteListener;
public MyViewHolder(@NonNull View itemView, OnNoteListener onNoteListener) {
super(itemView);
imageView = itemView.findViewById(R.id.imageView);
textView1 = itemView.findViewById(R.id.textView1);
textView2 = itemView.findViewById(R.id.textView2);
this.onNoteListener = onNoteListener;
itemView.setOnClickListener(this);
}
public void setData(int resource, String text1, String text2)
{
imageView.setImageResource(resource);
textView1.setText(text1);
textView2.setText(text2);
}
@Override
public void onClick(View view) {
onNoteListener.onNoteClick(getAdapterPosition());
}
}
public interface OnNoteListener{
void onNoteClick(int position);
}
@NonNull
@Override
public MyAdapter.MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.one_item_layout, parent,
false);
return new MyViewHolder(view, mOnNoteListener); }
@Override
public void onBindViewHolder(@NonNull MyAdapter.MyViewHolder holder, int position) {
int resouce = data_items.get(position).getImage();
String text1 = data_items.get(position).getText1();
String text2 = data_items.get(position).getText2();
holder.setData(resouce, text1, text2);
}
@Override
public int getItemCount() {
return data_items.size();
}}
MainActivity.java
MainActivity.java
public class MainActivity extends AppCompatActivity{
DrawerLayout drawerLayout;
NavigationView navigationView;
NavController navController;
AppBarConfiguration appBarConfiguration;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
drawerLayout = findViewById(R.id.drawer);
navigationView = findViewById(R.id.navigationView);
navController = Navigation.findNavController(this, R.id.navigation_resource_file);
appBarConfiguration =
new AppBarConfiguration.Builder(navController.getGraph())
.setDrawerLayout(drawerLayout)
.build();
NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
NavigationUI.setupWithNavController(navigationView, navController);
}
@Override
public boolean onSupportNavigateUp() {
return NavigationUI.navigateUp(navController, appBarConfiguration);
}
@Override
public void onBackPressed() {
if(drawerLayout.isDrawerOpen(GravityCompat.START))
drawerLayout.closeDrawer(GravityCompat.START);
else
super.onBackPressed();
}}
activity_main.xml
activity_main.xml
<androidx.drawerlayout.widget.DrawerLayout
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:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/drawer">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment
android:id="@+id/navigation_resource_file"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="0dp"
android:layout_height="0dp"
app:defaultNavHost="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navGraph="@navigation/navigation_resource_file" />
</androidx.constraintlayout.widget.ConstraintLayout>
<com.google.android.material.navigation.NavigationView
android:id="@+id/navigationView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:menu="@menu/menu_resource_file">
</com.google.android.material.navigation.NavigationView>
</androidx.drawerlayout.widget.DrawerLayout>
推荐答案
RecyclerView可见性消失/可见是为了确保您的代码正常运行. 如您所见，您的书签视图正变得正确.
RecyclerView visibility gone/visible was to ensure that your code is working fine. As you can see that your bookmark view is coming proper.
fragment_home布局中的问题. FrameLayout和Recyclerview都已获得全屏显示.因此，当您单击RV项目时，它正在打开书签，但对您不可见.
The issue in fragment_home layout. FrameLayout and Recyclerview, both have acquired full screen. So when you click on RV items, It is opening bookmark but it is not visible to you.
fragment_home中的FrameLayout用作书签片段的容器.
FrameLayout in fragment_home is working as a container for Bookmark fragment.
由于您使用的是NavController，因此可以像打开HomeFragment一样使用它来打开Bookmark片段.
Since you are using NavController, so use this to open your Bookmark fragment like you do to open HomeFragment.
这篇关于片段不会在RecyclerView项上打开的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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