Question

我无法在我的RecyclerView中显示我的Firebase数据。我可以将其他活动中的数据添加到Firebase数据库中，我在查看RecyclerView中的数据时遇到了问题。

我创建了一个带有Recipe.class和RecipeViewHolder的FriebaseRecyclerAdapter。如果我的类（名称，评级和描述），我的ViewHolder需要三个部分。我没有在Logcat中收到任何有用的错误。

RecipeList.class

$(document).on('click', 'a[href^="#"]', function (event) {
  event.preventDefault();
  $('html, body').animate({
    scrollTop: $($.attr(this, 'href')).offset().top
  }, 1400);
});

$(document).ready(function(){
  $(".hamburger").on('click', function(event) {
    event.preventDefault();
    $(".navigation-list").toggle();
  });
});

Recipe.Class

public class RecipeList extends AppCompatActivity {

private RecyclerView recipes;
private FloatingActionButton newRecipeBtn;

private DatabaseReference mRecipeDatabase;
private RecyclerView.LayoutManager mLayoutManager;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_recipe_list);
    getWindow().setSoftInputMode(
            WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

    mRecipeDatabase = FirebaseDatabase.getInstance().getReference("Recipes");
    newRecipeBtn = findViewById(R.id.fab);
    recipes = findViewById(R.id.recyclerView);

    recipes.setHasFixedSize(true);
    mLayoutManager = new LinearLayoutManager(this);
    recipes.setLayoutManager(mLayoutManager);
    recipes.setItemAnimator(new DefaultItemAnimator());
    recipes.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));

    FirebaseRecyclerAdapter<Recipe, RecipeViewHolder> adapter = new FirebaseRecyclerAdapter<Recipe, RecipeViewHolder>(
            Recipe.class,
            R.layout.recycler_list_item,
            RecipeViewHolder.class,
            mRecipeDatabase
    ) {
        @Override
        protected void populateViewHolder(RecipeViewHolder viewHolder, Recipe model, int position) {
            viewHolder.setName(model.getName());
            viewHolder.setRating(model.getRating());
            viewHolder.setDescription(model.getDescription());
        }
    };
        recipes.setAdapter(adapter);
}


public void toRecipeAdd(View view){
    Intent intent = new Intent(RecipeList.this, RecipeAdd.class);
    startActivity(intent);
}


public static class RecipeViewHolder extends RecyclerView.ViewHolder{
    TextView text_name, text_rating, text_description;
    public RecipeViewHolder(View itemView){
        super(itemView);
        text_name = itemView.findViewById(R.id.recipeNameTextView);
        text_rating = itemView.findViewById(R.id.recipeRatingTextView);
        text_description = itemView.findViewById(R.id.recipeDescriptionTextView);
    }
    public void setName(String name){
        text_name.setText(name);
    }
    public void setRating(String rating){
        text_rating.setText(rating);
    }
    public void setDescription(String description){
        text_description.setText(description);
    }
}


  }

Answer 1

删除以下内容以显示数据：

recipes.setHasFixedSize(true);

参考：

发送firebase到recyclerview android的问题。没有数据显示

1 个答案: