Android中的项目之间的大空间RecyclerView

Question

我使用RecyclerView从每次在EditText中点击“Enter”时填充的对象列表加载数据。但是我面临的问题是我添加的第一个项目显示OK，当我添加第二个项目时，它显示了第一个和第二个之间的很大差距，并且如果我不断添加项目，则差距会变大，适合整个屏幕。

这是我的适配器：

public class CategoryAdapter extends RecyclerView.Adapter<CategoryAdapter.MyViewHolder> { 

    private Context mContext; 
    private List<Category> categoryList; 
    private Category category; 

    public class MyViewHolder extends RecyclerView.ViewHolder { 
     public TextView title, count; 
     public EditText nameCategory; 

     public MyViewHolder(View view) { 
      super(view); 
      nameCategory = (EditText) view.findViewById(R.id.edittext_category); 
      //overflow = (ImageView) view.findViewById(R.id.overflow); 
     } 
    } 


    public CategoryAdapter(Context mContext, List<Category> categoryList) { 
     this.mContext = mContext; 
     this.categoryList = categoryList; 
    } 

    @Override 
    public CategoryAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     View itemView = LayoutInflater.from(parent.getContext()) 
       .inflate(R.layout.adapter_category, parent, false); 

     return new MyViewHolder(itemView); 
    } 

    @Override 
    public void onBindViewHolder(final CategoryAdapter.MyViewHolder holder, final int position) { 
     category = categoryList.get(position); 
     holder.nameCategory.setText(category.getCategory_name()); 
    } 


    @Override 
    public int getItemCount() { 
     return categoryList.size(); 
    } 
} 

这是适配器的XML：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <LinearLayout 
     android:layout_below="@+id/toolbar" 
     android:id="@+id/add_category_layout" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content"> 

     <ImageView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:src="@drawable/minus_red" 
      android:paddingTop="20dp" 
      android:paddingLeft="20dp" 
      android:paddingRight="20dp" 
      android:paddingBottom="20dp"/> 

     <EditText 
      android:id="@+id/edittext_category" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:hint="@string/add_new_category" 
      android:textColorHint="#b1b1b1" 
      android:textColor="@color/text_color" 
      android:textSize="@dimen/s_text_size" 
      android:paddingTop="20dp" 
      android:background="#ffffff" 
      android:maxLines="1"/> 
    </LinearLayout> 

</LinearLayout> 

这是我的活动内RecyclerView的XML代码：

<android.support.v7.widget.RecyclerView 
    android:id="@+id/recycler_view" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:clipToPadding="false" 
    android:scrollbars="vertical" 
    android:visibility="invisible" 
    android:layout_below="@id/layout_bar"/> 

这是我如何在我的活动中定义recyclerView：

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

而且我用这个代码来填充它我的活动里面还有：

edit_category.setOnKeyListener(new OnKeyListener() { 
          public boolean onKey(View v, int keyCode, KeyEvent event) { 
           // If the event is a key-down event on the "enter" button 
           if ((event.getAction() == KeyEvent.ACTION_DOWN) && 
             (keyCode == KeyEvent.KEYCODE_ENTER)) { 

            System.out.println("Entrou"); 
            Category category = new Category(); 
            category.setCategory_name(edit_category.getText().toString()); 
            categoriesList.add(category); 
            adapter = new CategoryAdapter(getApplicationContext(), categoriesList); 
            recyclerView.setAdapter(adapter); 
            recyclerView.setVisibility(View.VISIBLE); 
            edit_category.setText(""); 



            // hide virtual keyboard 
            InputMethodManager imm = 
              (InputMethodManager)getApplicationContext().getSystemService(Context.INPUT_METHOD_SERVICE); 
            imm.hideSoftInputFromWindow(edit_category.getWindowToken(), 0); 
            return true; 
           } 
           return false; 
          } 
         }); 

Answer 1

适配器与layout_height="match_parent"充气行，这意味着每行的高度将对应于RecyclerView的整个高度。也许你想用wrap_content代替：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" android:layout_width="match_parent" 
    android:layout_height="wrap_content"> 
    ...