Myujth

I have looked at many solutions and have made adjustments based on feedback from a previous version of the code I had but i still cant seem to get it to work and have the same error

JudgeActivty:

@Override
protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_judge);

 RecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
 RecyclerView.setHasFixedSize(true);
 RecyclerView.setLayoutManager(new LinearLayoutManager(this));

 ProgressCircle = findViewById(R.id.progress_circle);

 mUploads = new ArrayList<>();

 DatabaseRef = FirebaseDatabase.getInstance().getReference("uploads");

 DatabaseRef.addValueEventListener(new ValueEventListener() 

 @Override
 public void onDataChange(DataSnapshot dataSnapshot) 
 for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) 
 UploadClass upload =
 postSnapshot.getValue(UploadClass.class);
 mUploads.add(upload);
 
 Adapter = new ImageAdapter(JudgeActivity.this, mUploads);
 ProgressCircle.setVisibility(View.INVISIBLE);
 RecyclerView.setAdapter(Adapter);
 
 );

Adapter:

public class ImageAdapter extends
 RecyclerView.Adapter<ImageAdapter.ImageViewHolder> 
 private Context mContext;
 private List<UploadClass> mUploads;

 public ImageAdapter(Context context, List<UploadClass> uploads) 
 mContext = context;
 mUploads = uploads;
 


 @Override
 public ImageViewHolder onCreateViewHolder(ViewGroup parent, int viewType) 
 View v = LayoutInflater.from(mContext).inflate(R.layout.image_item,
 parent, false);
 return new ImageViewHolder(v);
 

 @Override
 public void onBindViewHolder(ImageViewHolder holder, int position) 
 UploadClass uploadCurrent = mUploads.get(position);
 holder.textViewName.setText(uploadCurrent.getName());
 Picasso.with(mContext)
 .load(uploadCurrent.getImageUrl())
 .placeholder(R.mipmap.ic_launcher)
 .fit()
 .centerCrop()
 .into(holder.imageView);

 


 @Override
 public int getItemCount() 
 return mUploads.size();
 

 public class ImageViewHolder extends RecyclerView.ViewHolder 
 public TextView textViewName;
 public ImageView imageView;

 public ImageViewHolder(View itemView) 
 super(itemView);

 textViewName = itemView.findViewById(R.id.text_view_name);
 imageView = itemView.findViewById(R.id.image_view_upload);
 
 

Is there actually a problem? That "error" isn't an error, it's just a warning. And it's shown because, when the Activity is first displayed, the RecyclerView has no Adapter set to it. You only set the Adapter when a Firebase value changes, which is a bad idea.

You should create and set the Adapter outside of the ValueEventListener:

RecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
RecyclerView.setHasFixedSize(true);
RecyclerView.setLayoutManager(new LinearLayoutManager(this));
Adapter = new ImageAdapter(JudgeActivity.this, mUploads);
RecyclerView.setAdapter(Adapter);

Also, in Java, variable names follow camelCase, not TitleCase. You don't have to follow that guideline, but it makes it less confusing for others when debugging your code.