GridLayoutManager 未显示 Android 中的所有元素

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【中文标题】GridLayoutManager 未显示 Android 中的所有元素【英文标题】:GridLayoutManager is not showing all the elements in Android 【发布时间】:2020-10-09 16:02:53 【问题描述】:

我设置了一个跨度为 2 的 GridLayoutManager,理想情况下,它应该在 2 列中显示我的元素,但输出只显示一个元素。

下面是代码:

适配器

    public class MemoriesAdapter extends RecyclerView.Adapter<MemoriesAdapter.MemoriesViewHolder> 

    private static final String TAG = "MemoriesAdapter";
    private final LayoutInflater mInflater;
    private final List<List<String>> titleList;
    private final List<List<StorageReference>> imageList;

    public MemoriesAdapter(Context context, List<List<String>> titleList, List<List<StorageReference>> imageList) 
        this.mInflater = LayoutInflater.from(context);
        this.titleList = titleList;
        this.imageList = imageList;
        Log.d(TAG, "Constructor ");
    

    @NonNull
    @Override
    public MemoriesAdapter.MemoriesViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) 
        View view = mInflater.inflate(R.layout.memories_cards, parent, false);
        MemoriesAdapter.MemoriesViewHolder viewHolder = new MemoriesAdapter.MemoriesViewHolder(view);
        Log.d(TAG, "onCreateViewHolder");
        return viewHolder;
    

    @Override
    public void onBindViewHolder(@NonNull MemoriesAdapter.MemoriesViewHolder holder, int position) 
        if (!(titleList.isEmpty() || imageList.isEmpty())) 
            Log.d(TAG, "Lists are not empty, proceeding.");

            String title = String.valueOf(titleList.get(position));
            holder.title.setText(title);
            // TODO: get storage ref into the imageview
        
    

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

    public class MemoriesViewHolder extends RecyclerView.ViewHolder 

        private ImageView image;
        private TextView title;

        private ImageView image2;
        private TextView title2;

        public MemoriesViewHolder(@NonNull View itemView) 
            super(itemView);
            Log.d(TAG, "ViewHolder");
            image = itemView.findViewById(R.id.memory_image_one);
            title = itemView.findViewById(R.id.memory_title);
        
    

片段

memoriesViewModel.getTitleList().observe(getViewLifecycleOwner(), titList -> 
            titleList.add(titList);
            memoriesAdapter.notifyDataSetChanged();
            Log.d(TAG, "Memories Frag " + titleList);
        );

GridLayoutManager manager = new GridLayoutManager(getContext(), 2);
        memoryRecyclerView.setHasFixedSize(true);
        memoryRecyclerView.setLayoutManager(manager);
        memoryRecyclerView.setAdapter(memoriesAdapter);

item_layout

<androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/memory_dashboard_card"
        android:layout_
        android:layout_
        android:background="@drawable/memories_card_yellow"
        >

        <ImageView
            android:id="@+id/memory_image_one"
            android:layout_
            android:layout_
            android:layout_marginTop="12dp"
            android:layout_marginStart="12dp"
            android:layout_marginEnd="12dp"
            android:layout_marginBottom="60dp"
            android:src="@drawable/unicorn"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            />

        <TextView
            android:id="@+id/memory_title"
            android:layout_
            android:layout_
            android:text="My first date was epic"
            android:textSize="16sp"
            android:textColor="#000"
            android:textStyle="bold"
            android:textAlignment="center"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/memory_image_one" />

    </androidx.constraintlayout.widget.ConstraintLayout>

布局

<androidx.recyclerview.widget.RecyclerView
        android:id="@+id/memories_recycler_view"
        android:layout_
        android:layout_
        app:spanCount="2"
        tools:listitem="@layout/memories_cards" />

如果您需要更多代码,请发表评论,如果我提供了任何不必要的细节,请进行编辑

谢谢!

编辑:我已经添加了整个适配器,我正在删除布局文件。

【问题讨论】:

在card_view中你设置了视图的宽度和高度吗?? 是的,我确实设置了高度和宽度 显示完整的适配器和项目布局 我已经完成了更改。 尝试使用 StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL); 【参考方案1】:

我知道这有点晚了,但我遇到了同样的问题并修复它确保 layout_width 和 layout_height 的值是 match_parent,我说的是你在 recyclerview 适配器中使用的 xml 布局,希望你搞定了。

【讨论】:

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