Android 看不到我的回收视图

我似乎无法连接适配器。我正在尝试创建一个RecyclerViewCardView。但是，它不会显示在模拟器上。我收到一条错误消息：

E/RecyclerView

：未连接适配器；跳过布局

这里是我设置适配器的地方

madapter = new CardAdapter( itemList, CardviewRecycler.this );
recyclerView.setAdapter(madapter); 



          public class CardviewRecycler extends AppCompatActivity {
        // URL string to call data from myPHPAdmin localhost database.
        private static final String URL_ITEMLIST = "http://192.168.240.1/ImageJsonData.php";

        public RecyclerView recyclerView;
        //private RecyclerView.Adapter adapter;
        private  CardAdapter madapter;
        public List<ItemList> itemList;

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_cardviewrecycler);

            // Initializing ItemList Array.
            itemList = new ArrayList<>();


            //Calling the Recyclerview
            recyclerView = findViewById(R.id.recyclerview);
            recyclerView.setHasFixedSize(true);
            recyclerView.setLayoutManager(new LinearLayoutManager(this));


            //Loading the RecyclerView data.
            loadItemListData();
        }

        public void loadItemListData(){

            StringRequest stringRequest = new StringRequest(Request.Method.GET, URL_ITEMLIST,
                    new Response.Listener<String>() {

                        @Override
                        public void onResponse(String response) {
                            try {
                                //converting the string to json array object
                                JSONArray array = new JSONArray(response);

                                //traversing through all the objects
                                for (int i = 0; i < array.length(); i++) {

                                    //getting item object from json array
                                    JSONObject itemobj = array.getJSONObject(i);

                                    int id = itemobj.getInt("id");
                                    String image_title = itemobj.getString("image_title");
                                    String image_url = itemobj.getString("image_url");

                                    ItemList item = new ItemList(id, image_title, image_url);
                                    itemList.add(item);
                                }

                                //creating adapter object and setting it to recyclerview
                                madapter = new CardAdapter( itemList, CardviewRecycler.this );
                                recyclerView.setAdapter(madapter);

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }
                    },
                    new Response.ErrorListener() {
                        @Override
                        public void onErrorResponse(VolleyError error) {

                        }
                    });

            //adding our stringrequest to queue
            Volley.newRequestQueue(this).add(stringRequest);
        }

    }

这是我的cardview布局文件

        <?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/cardview1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
card_view:cardElevation="5dp"
card_view:contentPadding="5dp"
card_view:cardCornerRadius="5dp"
card_view:cardMaxElevation="5dp">

<RelativeLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="#ECEFF1">

    <ImageView
        android:id="@+id/VolleyImageView"
        android:layout_width="150dp"
        android:layout_height="100dp"
        android:layout_marginBottom="10dp"
        android:layout_marginTop="10dp"
        android:scaleType="center"
        android:src="@mipmap/ic_launcher"
        android:contentDescription="TODO" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/VolleyImageView"
        android:layout_toEndOf="@+id/VolleyImageView"
        android:layout_marginLeft="20dp"
        android:layout_marginStart="20dp"
        android:textSize="20sp"
        android:textColor="#000"
        android:text="@string/JSonImage"
        android:id="@+id/ImageNameTextView"
        android:layout_centerVertical="true"/>

</RelativeLayout>

</android.support.v7.widget.CardView>
</LinearLayout>

---

您没有正确设置列表项字段

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        ItemList itemlist = itemList.get(position);
        holder.ImageTitleTextView.setText(itemlist.getTitle()); // you were setting getImage here 
        Glide.with(context)
                .load(itemlist.getImage())
                .into(holder.VollyImageView); // you were setting image on itemView which is not an ImageView.
    }

对于列表项视图，应该使用

wrap\u content

。如果您将

匹配\u parent

，您的一个项目将覆盖所有屏幕

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" //changed this
    android:orientation="vertical">

E/RecyclerView：未连接适配器

---

这只是一个警告，你可以忽略它

在您正在获取的Itemlist中，但还需要为每个get设置-eg-public void setId（int id）{this.id=id；}在加载list之前尝试调用setAdapter，在加载数据之后尝试调用adapter.notifydatasetchanged（）。我看到了我的混乱。谢谢但我还是有同样的问题。我在方法中添加了adapter.notifydatachange（），并将setAdapter移动到onCreate。我在ItemList类中添加了setter。我对Adapter类中的项目列表进行了更正…并在布局高度上对内容进行了换行。还有其他建议吗？

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        ItemList itemlist = itemList.get(position);
        holder.ImageTitleTextView.setText(itemlist.getTitle()); // you were setting getImage here 
        Glide.with(context)
                .load(itemlist.getImage())
                .into(holder.VollyImageView); // you were setting image on itemView which is not an ImageView.
    }

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" //changed this
    android:orientation="vertical">