firebase ui 升级到 3.2.2 时未显示输出

Question

当我将我的 firebase-ui 版本升级到 3.2.2 时，firebaserecycleradapter 不会显示我的代码的任何输出。起初，当我遇到 multidex 错误时，我将所有库版本升级到最新版本，依赖于应用程序 lvl gradle，升级后发现问题是 Firebaserecycleradapter 方法，然后我搜索它并在运行应用程序后写入，列表视图不显示请帮助我。

onStart():

 @Override
    protected void onStart() {
        super.onStart();

        FirebaseRecyclerOptions <Users> options = new FirebaseRecyclerOptions.Builder<Users>()
                .setQuery(mUserDatabase,Users.class)
                .build();
        FirebaseRecyclerAdapter<Users, UsersViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Users, UsersViewHolder>(options) {
            @NonNull
            @Override
            public UsersViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
                View view = LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.user_list_layout, parent, false);
                return new UsersViewHolder(view);
            }

            @Override
            protected void onBindViewHolder(@NonNull UsersViewHolder holder, int position, @NonNull Users model) {
                holder.setName(model.getName());
                holder.setStatus(model.getStatus());
                holder.setRIDNo(model.getRidno());
                holder.setUserImage(model.getThumb_image(), getApplicationContext());

                //to get key
                final String user_id = getRef(position).getKey();

                holder.mView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        Intent profileIntent = new Intent(UsersActivity.this, ProfileActivity.class);
                        profileIntent.putExtra("user_id", user_id);
                        startActivity(profileIntent);

                    }
                });
            }

        };
        mUsersList.setAdapter(firebaseRecyclerAdapter);

    }

而viewholder是：

//User list viewholder
    public static class UsersViewHolder extends RecyclerView.ViewHolder {

        static View mView;
        private CircleImageView mUserView;

        public UsersViewHolder(View itemView) {
            super(itemView);

            mView = itemView;
        }

        public static void setName(String name){
            TextView userNameView = (TextView) mView.findViewById(R.id.user_single_name);
            userNameView.setText(name);
        }
        public static void setStatus(String status){
            TextView userStatusView = (TextView) mView.findViewById(R.id.user_single_status);
            userStatusView.setText(status);
        }
        public static void setRIDNo(String ridno){
            TextView userRIDNoView = (TextView) mView.findViewById(R.id.user_single_ridno);
            userRIDNoView.setText(ridno);
        }
        public static void setUserImage(String thumb_image, Context ctx){
            CircleImageView userImageView = (CircleImageView) mView.findViewById(R.id.user_single_image);
            Picasso.with(ctx).load(thumb_image).placeholder(R.drawable.default_avatar).into(userImageView);
        }
    }

Answer 1

为了使您的代码正常工作，请考虑使用以下步骤。

1. 从 UsersViewHolder 类的声明中删除 static。应该只有：

   public class UsersViewHolder extends RecyclerView.ViewHolder {/* ... */}
   

2. 同时从mView 字段和所有方法中删除static 关键字。您的持有人类应如下所示：

   public class UsersViewHolder extends RecyclerView.ViewHolder {
       private View mView;
       private CircleImageView mUserView;
   
       public UsersViewHolder(View itemView) {
           super(itemView);
           mView = itemView;
       }
   
       public void setName(String name){
           TextView userNameView = (TextView) mView.findViewById(R.id.user_single_name);
           userNameView.setText(name);
       }
       public void setStatus(String status){
           TextView userStatusView = (TextView) mView.findViewById(R.id.user_single_status);
           userStatusView.setText(status);
       }
       public void setRIDNo(String ridno){
           TextView userRIDNoView = (TextView) mView.findViewById(R.id.user_single_ridno);
           userRIDNoView.setText(ridno);
       }
       public void setUserImage(String thumb_image, Context ctx){
           CircleImageView userImageView = (CircleImageView) mView.findViewById(R.id.user_single_image);
           Picasso.with(ctx).load(thumb_image).placeholder(R.drawable.default_avatar).into(userImageView);
       }
   }
   

3. 将onStart()方法中的所有代码移到onCreate()方法中，除了这行代码：

   super.onStart();
   

4. 使您的 firebaseRecyclerAdapter 变量全局化：

   private FirebaseRecyclerAdapter<Users, UsersViewHolder> firebaseRecyclerAdapter;
   

5. 从 onCreate() 方法中删除 FirebaseRecyclerAdapter<Blog, BlogViewHolder>。

6. 在onStart() 和onStop() 方法中添加以下代码行。

   @Override
   protected void onStart() {
       super.onStart();
       firebaseRecyclerAdapter.startListening();
   }
   
   @Override
   protected void onStop() {
       super.onStop();
       if(firebaseRecyclerAdapter != null) {
           firebaseRecyclerAdapter.stopListening();
       }
   }
   

7. 如果你正在使用身份验证，也请不要忘记在onStart()方法中添加这行代码：

   firebaseAuth.addAuthStateListener(authStateListener);