How to use fake data to test RecyclerView? - android-fragments

Question

I made my DataFakeGenerator to creat some fake datas to test my Recycelerview , but when i want to use it in one of my Fragments i have an error.
my error is in this line:
PostAdapter postAdapter = new PostAdapter(DataFakeGenerator.getData(this));
it says that i can not use "this",so what statement can i use in this parentheses?
here is my Fragment :
public class Frag_joke extends Fragment {
public static Fragment instance(){
Fragment fragment = new Frag_joke();
return fragment;
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
ViewGroup layout = (ViewGroup)inflater.inflate(R.layout.frag_joke,null);
RecyclerView recyclerView = (RecyclerView)layout.findViewById(R.id.recycler_view);
PostAdapter postAdapter = new PostAdapter(DataFakeGenerator.getData(this));
recyclerView.setLayoutManager(new LinearLayoutManager(this.getActivity()));
recyclerView.setAdapter(postAdapter);
return layout;
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}}
here is my DataFakeGenerator :
public class DataFakeGenerator {
public static List<Post> getData(){
List<Post> posts= new ArrayList<>();
for(int i=0;i<=6;i++){
Post post= new Post();
post.setId(i);
post.setContent("sample text");
posts.add(post);
}
return posts;
}}
and here is my PostAdapter:
public class PostAdapter extends RecyclerView.Adapter<PostAdapter.PostViewHolder>{
private Context context;
private List<Post> posts;
public PostAdapter(Context context, List<Post>posts){
this.context = context;
this.posts = posts;
}
#Override
public PostViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.layout_post,parent,false);
return new PostViewHolder(view);
}
#Override
public void onBindViewHolder(PostViewHolder holder, int position) {
Post post=posts.get(position);
holder.content.setText(post.getContent());
}
#Override
public int getItemCount() {
return posts.size();
}
public class PostViewHolder extends RecyclerView.ViewHolder{
private TextView content;
public PostViewHolder(View itemView) {
super(itemView);
content=(TextView)itemView.findViewById(R.id.post_content);
}}}

Answer 1

You are probably confused with your implementation. DataFakeGenerator.getData() does not need any parameter. It's your adapter constructor that has 2.
To create your adapter you can use the following instead:
PostAdapter postAdapter = new PostAdapter(getContext(), DataFakeGenerator.getData());
PS: this wouldn't work with the adapter creation (if that's the code you are actually trying to use), as the Fragment is not a context (but the Activity is, which is why you can access it with getContext() from the fragment

Answer 2

You can set preview on any cardview if you've. Let's you have a cardview name item_emergency_contact then, you can use tools:listitem="#layout/your_card_view"
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/contacts_recyclerView_emergency"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="12dp"
android:layout_marginTop="20dp"
android:layout_marginEnd="20dp"
tools:listitem="#layout/item_emergency_contact"
app:layout_constraintTop_toBottomOf="#+id/add_emergency_contacts" />