Recycleview doesn't appear in a Fragment
原文
2020-02-03 18:16:52
6
2
java/
android/
android-fragments/
firebase-realtime-database/
android-recyclerview
Question
I'm trying to get some data from my firebase, so I created recycleview in activity to get the data, and it worked without problem.
But now, I added my recycle to a Fragment to get data, and it managed to get the data but I can't see it, the firenase ( on success ) tell me that it work, but I can't see the recycleview.
I searched more and more without finding any solution, there are another one have the same problem, and he didn't find any solution else, here .
RecyclerView doesn't appear in Fragment
I tried all the solution in this question but, it didn't work, now I spent more than two months without finding out the problem.
FriendsFragment
public class FriendsFragment extends Fragment {
DatabaseReference databaseReference;
RecyclerView recyclerView;
RecyclerView.Adapter adapter ;
ProgressDialog progressDialog;
List<ImageUploadInfo> list = new ArrayList<>();
private Context context;
public FriendsFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(com.wanjy.dannie.rivchat.R.layout.fragment_people, container, false);
context = view.getContext();
recyclerView = (RecyclerView) view.findViewById(R.id.recycleListFriend);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(context));
progressDialog = new ProgressDialog(context);
progressDialog.setMessage("Loading Images From Firebase.");
progressDialog.show();
databaseReference = FirebaseDatabase.getInstance().getReference("All_Image_Uploads_Database");
databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
for (DataSnapshot postSnapshot : snapshot.getChildren()) {
ImageUploadInfo imageUploadInfo = postSnapshot.getValue(ImageUploadInfo.class);
list.add(imageUploadInfo);
}
adapter = new RecyclerViewAdapter(context, list);
recyclerView.setAdapter(adapter);
progressDialog.dismiss();
}
@Override
public void onCancelled(DatabaseError databaseError) {
// Hiding the progress dialog.
progressDialog.dismiss();
}
});
return inflater.inflate(R.layout.fragment_people, container, false);
}
}
RecyclerViewAdapter
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
Context context;
List<ImageUploadInfo> MainImageUploadInfoList;
public RecyclerViewAdapter(Context context, List<ImageUploadInfo> TempList) {
this.MainImageUploadInfoList = TempList;
this.context = context;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview_items, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
ImageUploadInfo UploadInfo = MainImageUploadInfoList.get(position);
holder.imageNameTextView.setText(UploadInfo.getImageName());
//Loading image from Glide library.
Glide.with(context).load(UploadInfo.getImageURL()).into(holder.imageView);
}
@Override
public int getItemCount() {
return MainImageUploadInfoList.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
public ImageView imageView;
public TextView imageNameTextView;
public ViewHolder(View itemView) {
super(itemView);
imageView = (ImageView) itemView.findViewById(R.id.imageView);
imageNameTextView = (TextView) itemView.findViewById(R.id.ImageNameTextView);
}
}
}
ImageUploadInfo
public class ImageUploadInfo {
public String imageName;
public String imageURL;
public ImageUploadInfo() {
}
public ImageUploadInfo(String name, String url) {
this.imageName = name;
this.imageURL= url;
}
public String getImageName() {
return imageName;
}
public String getImageURL() {
return imageURL;
}
}
recyclerview_items
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/cardview1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
card_view:cardElevation="5dp"
card_view:contentPadding="5dp"
card_view:cardCornerRadius="5dp"
card_view:cardMaxElevation="5dp">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#FFFFFF"
android:orientation="vertical">
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:orientation="horizontal"
android:background="#FFFFFF"
android:padding="1dp">
<ImageView
android:layout_height="50dp"
android:layout_width="50dp"
android:src="@android:drawable/ic_delete"
android:scaleType="fitXY"/>
<LinearLayout
android:layout_height="match_parent"
android:layout_width="wrap_content"
android:orientation="vertical"
android:background="#FFFFFF"
android:layout_weight="1.0"
android:padding="3dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="15dp"
android:textColor="#000000"
android:text="أخبار الدولة"
android:gravity="center"
android:id="@+id/myname"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="التاريخ"
android:id="@+id/date"
android:textColor="#000000"/>
</LinearLayout>
</LinearLayout>
<ImageView
android:id="@+id/imageView"
android:layout_width="fill_parent"
android:layout_height="180dp"
android:src="@mipmap/ic_launcher"
android:background="#FFFFFF"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:layout_weight="1.0"
android:textSize="14sp"
android:textColor="#000000"
android:layout_gravity="right"
android:padding="4dp"
android:gravity="right"
android:id="@+id/ImageNameTextView"/>
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:orientation="horizontal"
android:background="#FFFFFF"
android:padding="2dp">
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:orientation="horizontal"
android:background="#FFFFFF"
android:layout_weight="1.0"
android:gravity="center">
<ImageView
android:layout_height="30dp"
android:layout_width="30dp"
android:src="@android:drawable/ic_delete"
android:scaleType="fitXY"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="0"
android:textColor="#000000"
android:padding="2dp"/>
</LinearLayout>
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:orientation="horizontal"
android:background="#FFFFFF"
android:layout_weight="1.0"
android:gravity="center">
<ImageView
android:layout_height="30dp"
android:layout_width="30dp"
android:src="@android:drawable/ic_delete"
android:scaleType="fitXY"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="0"
android:textColor="#000000"
android:padding="2dp"/>
</LinearLayout>
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:orientation="horizontal"
android:background="#FFFFFF"
android:layout_weight="1.0"
android:gravity="center">
<ImageView
android:layout_height="30dp"
android:layout_width="30dp"
android:src="@android:drawable/ic_delete"
android:scaleType="fitXY"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="0"
android:textColor="#000000"
android:padding="2dp"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
fragment_people
<RelativeLayout 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.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycleListFriend"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="15dp" />
</android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>
My build gradle
compile 'com.android.support:appcompat-v7:24.2.1'
compile 'com.android.support:design:24.2.1'
compile 'com.google.firebase:firebase-core:9.8.0'
compile 'com.google.firebase:firebase-database:9.8.0'
compile 'com.google.firebase:firebase-auth:9.8.0'
testCompile 'junit:junit:4.12'
compile 'de.hdodenhof:circleimageview:2.1.0'
compile 'com.yarolegovich:lovely-dialog:1.0.4'
compile 'com.android.support:cardview-v7:25.0.1'
compile 'com.android.support:percent:25.0.1'
compile 'com.github.bumptech.glide:glide:3.7.0'
- Note My recycle work in Activity without problem, but it doesn't appear in my fragment .
I hope someone find the problem in my code.
2 answers
solution1
0 2020-02-03 18:28:32
Can you make any view show in the fragment? I noticed your MyFragment class is initializing fragment_people.xml but your xml class is named Fragment.xml unless that is a typo. Verify you can show any type of view in your fragment before thinking it is a recycler view issue.
Also, in your adapter, you are using an item layout with name recyclerview_items.xml but you have the class named Recycle item unless that is a typo as well.
solution2
0 2020-02-04 10:19:52
It work now, I just changed the fragment to this
public class FriendsFragment extends Fragment {
DatabaseReference databaseReference;
RecyclerView recyclerView;
RecyclerView.Adapter adapter ;
ProgressDialog progressDialog;
List<ImageUploadInfo> list = new ArrayList<>();
private Context context;
public FriendsFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(com.wanjy.dannie.rivchat.R.layout.fragment_people, container, false);
context = view.getContext();
return inflater.inflate(R.layout.fragment_people, container, false);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState)
{
recyclerView = (RecyclerView) view.findViewById(R.id.recycleListFriend);
progressDialog = new ProgressDialog(context);
progressDialog.setMessage("Loading Images From Firebase.");
progressDialog.show();
databaseReference = FirebaseDatabase.getInstance().getReference("All_Image_Uploads_Database");
databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
for (DataSnapshot postSnapshot : snapshot.getChildren()) {
ImageUploadInfo imageUploadInfo = postSnapshot.getValue(ImageUploadInfo.class);
list.add(imageUploadInfo);
}
adapter = new RecyclerViewAdapter(context, list);
recyclerView.setAdapter(adapter);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(context));
progressDialog.dismiss();
}
@Override
public void onCancelled(DatabaseError databaseError) {
// Hiding the progress dialog.
progressDialog.dismiss();
}
});
super.onViewCreated(view, savedInstanceState);
}
}
I don't what was the problem but, I goggled for an example, and I found someone use method oncreateview So I did like him , and I moved this line
recyclerView.setLayoutManager(new LinearLayoutManager(context));
to under this line
recyclerView.setAdapter(adapter);
Now it work without problem.
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