Question

当我在List<OrderList>中添加loadOrdersData()任何项目时，会抛出此内容：

D / ViewGroup：已调用addInArray，这= android.support.v7.widget.RecyclerView {41cab8f0 VFED .... .F .... ID 0,0-480,770＃7f0c0073 app：id / rv}调用堆栈= java.lang.Throwable中：addInArray在android.view.ViewGroup.addInArray（ViewGroup.java:3786）在android.view.ViewGroup.addViewInner（ViewGroup.java:3740）在android.view.ViewGroup.addView（ViewGroup中。 Java的：3564）在android.view.ViewGroup.addView（ViewGroup.java:3509）在android.support.v7.widget.RecyclerView $ 5.addView（RecyclerView.java:649）在android.support.v7.widget.ChildHelper。 addView（ChildHelper.java:107）在android.support.v7.widget.RecyclerView $ LayoutManager.addViewInt（RecyclerView.java:7115）在android.support.v7.widget.RecyclerView $ LayoutManager.addView（RecyclerView.java:7073）在android.support.v7.widget.RecyclerView $ LayoutManager.addView（RecyclerView.java:7061）在android.support.v7.widget.LinearLayoutManager.layoutChunk（LinearLayoutManager.java:1428）在android.support.v7.widget.LinearLayoutManager .fill伪（LinearLayoutManager.ja VA：1377）在android.support.v7.widget.LinearLayoutManager.onLayoutChildren（LinearLayoutManager.java:578）在android.support.v7.widget.RecyclerView.dispatchLayoutStep2（RecyclerView.java:3315）在android.support.v7.widget .RecyclerView.dispatchLayout（RecyclerView.java:3124）在android.support.v7.widget.RecyclerView.onLayout（RecyclerView.java:3568）在android.view.View.layout（View.java:15125）在android.view。 ViewGroup.layout（ViewGroup.java:4862）在android.support.v4.widget.DrawerLayout.onLayout（DrawerLayout.java:1197）在android.view.View.layout（View.java:15125）在android.view.ViewGroup .layout（ViewGroup.java:4862）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:515）在android.widget.FrameLayout.onLayout（FrameLayout.java:450）在android.view.View.layout（查看。的java：15125）在android.view.ViewGroup.layout（ViewGroup.java:4862）在android.support.v7.widget.ActionBarOverlayLayout.onLayout（ActionBarOverlayLayout.java:433）在android.view.View.layout（View.java ：15125）在android.vi ew.ViewGroup.layout（ViewGroup.java:4862）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:515）在android.widget.FrameLayout.onLayout（FrameLayout.java:450）在android.view.View.layout （View.java:15125）在android.view.ViewGroup.layout（ViewGroup.java:4862）在android.widget.LinearLayout.setChildFrame（LinearLayout.java:1888）在android.widget.LinearLayout.layoutVertical（LinearLayout.java： 1742）在android.widget.LinearLayout.onLayout（LinearLayout.java:1651）在android.view.View.layout（View.java:15125）在android.view.ViewGroup.layout（ViewGroup.java:4862）在机器人。 widget.FrameLayout.layoutChildren（FrameLayout.java:515）在android.widget.FrameLayout.onLayout（FrameLayout.java:450）在android.view.View.layout（View.java:15125）在android.view.ViewGroup.layout （ViewGroup.java:4862）在android.view.ViewRootImpl.performLayout（ViewRootImpl.java:2323）在android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:2029）在android.view.ViewRootImpl.doTraversal（ViewRootImpl.java： 1192）在android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:6231）在android.view.Choreographer $ CallbackRecord.run（Choreographer.java:788）在android.view.Choreographer.doCallbacks（Choreographer.java:591）在android.view.Choreographer.doFrame（Choreographer.java:560）在android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:774）在android.os.Handler.handleCallback（Handler.java:808）在android.os .Handler.dispatchMessage（Handler.java:103）在android.os.Looper.loop（Looper.java:193）在android.app.ActivityThread.main（ActivityThread.java:5305）在java.lang.reflect.Method中。 invokeNative（本地方法）在java.lang.reflect.Method.invoke（Method.java:515）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:824）在com.android.internal。 os.ZygoteInit.main（ZygoteInit.java:640）at dalvik.system.NativeStart.main（Native Method）

我尝试在adapter.notifyDataSetChanged(); setAdapter()之前添加：loadOrdersData()，但这没有任何意义。有谁看到它是由什么造成的？

以下是代码：

MainActivity：

public class CourierActivity extends AppCompatActivity {
    private TableLayout orderTable;
    private RecyclerView recyclerView;
    private RecycleAdapter adapter;
    private List<OrderListItem> listItems;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.courier_main);

        recyclerView = (RecyclerView) findViewById(R.id.rv);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(CourierActivity.this));
        adapter = new RecycleAdapter(listItems, getApplicationContext());
        recyclerView.setAdapter(adapter);
        loadOrdersData();
    }

    private void loadOrdersData() {    
        RequestQueue queue = Volley.newRequestQueue(this);
        StringRequest sr = new StringRequest(Request.Method.GET, URL, new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                listItems = new ArrayList<>();

                try {
                    String rsp = new String(response.getBytes("ISO-8859-1"), "UTF-8");
                    JSONArray orders = new JSONArray(rsp);

                    for (int i = 0; i < orders.length(); i++) {
                        OrderListItem listItem = new OrderListItem(
                                // .. 
                        );

                        listItems.add(listItem);
                    }

                    adapter = new RecycleAdapter(listItems, getApplicationContext());
                    recyclerView.setAdapter(adapter);
                } catch (JSONException | UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_SHORT);
            }
        }) {

            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                Map<String, String> params = new HashMap<String, String>();
                return params;
            }
        };

        queue.add(sr);
    }
}

OrderListItem：

public class OrderListItem {
    private String name;
    private String status;
    private String price;
    private String courier;

    public OrderListItem(String name, String status, String price, String courier) {
        this.name = name;
        this.status = status;
        this.price = price;
        this.courier = courier;
    }

    public String getName() { return name; }

    public String getStatus() { return status;}

    public String getPrice() { return price; }

    public String getCourier() { return courier; }
}

RecycleAdapter：

public class RecycleAdapter extends RecyclerView.Adapter<RecycleAdapter.ViewHolder> {

    private List<OrderListItem> listItems;
    private Context context;

    public RecycleAdapter(List<OrderListItem> listItems, Context context) {
        this.listItems = listItems;
        this.context = context;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.rv_item, parent, false);

        return new ViewHolder(v);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        OrderListItem listItem = listItems.get(position);

        holder.TextViewName.setText(listItem.getName());
        holder.TextViewStatus.setText(listItem.getStatus());
        holder.TextViewPrice.setText(listItem.getPrice());
        holder.TextViewCourier.setText(listItem.getCourier());
    }

    @Override
    public int getItemCount() {
        int count = 0;

        if (listItems != null && !listItems.isEmpty()) {
            count = listItems.size();
        }

        return count;
    }

    public class ViewHolder extends RecyclerView.ViewHolder {

        public TextView TextViewName;
        public TextView TextViewStatus;
        public TextView TextViewPrice;
        public TextView TextViewCourier;

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

            TextViewName = (TextView) itemView.findViewById(R.id.orderListName);
            TextViewStatus = (TextView) itemView.findViewById(R.id.orderListStatus);
            TextViewPrice = (TextView) itemView.findViewById(R.id.orderListPrice);
            TextViewCourier = (TextView) itemView.findViewById(R.id.orderListCourier);
        }
    }

}

@布局/ rv_item.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="wrap_content">

    <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:layout_margin="@dimen/activity_horizontal_margin"
        android:layout_height="wrap_content"
        android:layout_width="match_parent">

        <LinearLayout
            android:padding="@dimen/activity_horizontal_margin"
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/orderListName"
                android:text="Order name"
                android:textAppearance="@style/Base.TextAppearance.AppCompat.Large"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

            <TextView
                android:id="@+id/orderListStatus"
                android:text="Status"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

            <TextView
                android:id="@+id/orderListPrice"
                android:text="Price"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

            <TextView
                android:id="@+id/orderListCourier"
                android:text="Courier"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
        </LinearLayout>

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

</LinearLayout>

@布局/ main.xml中：

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context="com.example.seether.myapplication.CourierActivity"
    android:background="#fff"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/drawerLayout">


    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/rv"/>



</android.support.v4.widget.DrawerLayout>

修改即可。如果我将自定义数据输入listItems，则无需日志警告即可完美运行。

Answer 1

使用

adapter = new RecycleAdapter(listItems, CourierActivity.this);

而不是

adapter = new RecycleAdapter(listItems, getApplicationContext());

同时在RecyclerView

中添加方向

android:orientation="vertical"

更新此内容：

 String rsp = new String(response.getBytes(), "UTF-8");

Answer 2

试试这种方式

CourierActivity.java

public class RecycleAdapter extends RecyclerView.Adapter<RecycleAdapter.ViewHolder> {

    private List<OrderListItem> listItems;
    private Context context;

    public RecycleAdapter(List<OrderListItem> listItems, Context context) {
        this.listItems = listItems;
        this.context = context;
    }

    public setList(List<OrderListItem> listItems){
        //add list to parent list and notify your adapter
        this.listItems.addAll(listItems);
        notifyDataSetChanged();
    }
    ...
}

RecycleAdapter.java

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context="com.example.seether.myapplication.CourierActivity"
    android:background="#fff"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/drawerLayout">

    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/rv"/
</LinearLayout>

修改1：

main.xml中

public int getLastId() {
    int _id = 0;
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.query("calls", new String[] {BaseColumns._ID}, null, null, null, null, null);

    if (cursor.moveToLast()) {
        _id = cursor.getInt(0);
    }

    cursor.close();
    db.close();
    return _id;
}

Answer 3

我做了几处修改并写了评论。试试吧，

public class CourierActivity extends AppCompatActivity {
    private TableLayout orderTable;
    private RecyclerView recyclerView;
    private RecycleAdapter adapter;

    //********* Initialize over here **********//
    private List<OrderListItem> listItems = new ArrayList<>();
    private Context mContext;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.courier_main);

        //********** Initialize *******//
        mContext = CourierActivity.this;

        recyclerView = (RecyclerView) findViewById(R.id.rv);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(CourierActivity.this));

        //********* added class context *********//
        adapter = new RecycleAdapter(listItems, mContext);
        recyclerView.setAdapter(adapter);
        loadOrdersData();
    }

    private void loadOrdersData() {
        RequestQueue queue = Volley.newRequestQueue(this);
        StringRequest sr = new StringRequest(Request.Method.GET, URL, new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                //******** Remove this line *************//
                listItems = new ArrayList<>();

                //******** Add this line ************//
                listItems.clear();

                try {
                    String rsp = new String(response.getBytes("ISO-8859-1"), "UTF-8");
                    JSONArray orders = new JSONArray(rsp);

                    for (int i = 0; i < orders.length(); i++) {
                        OrderListItem listItem = new OrderListItem(
                                // ..
                        );

                        listItems.add(listItem);
                    }



                    //*********Remove these both lines **********//
                    adapter = new RecycleAdapter(listItems, getApplicationContext());
                    recyclerView.setAdapter(adapter);

                    //************ Add this line **********//
                    adapter.notifyDataSetChanged();

                } catch (JSONException | UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_SHORT);
            }
        }) {

            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                Map<String, String> params = new HashMap<String, String>();
                return params;
            }
        };

        queue.add(sr);
    }
}

Answer 4

Volley似乎异步获取数据，因此管理RecyclerView的最合理方法是首先使用空（但不为空）List和活动<设置适配器/ strong> context（例如Mainactivity.this）。

当Volley最终得到所有元素时，你添加了所有元素（而不是for(int i = 0; i < orders.length(); i++)你可以使用for(OrderListItem listItem : orders);），你可以调用adapter.notifyDataSetChanged()

Answer 5

而不是在ArrayList中创建新的RecyclerAdapter和onResponse()实例，我更喜欢，

清除listItems。
将所有OrderListItem个实例添加到listItems。
致电notifyDataSetChanged()的{{1}}。

例如：

adapter

并确保正确初始化@Override public void onResponse(String response) { listItems.clear(); try { //loop and add all items to listItems here adapter.notifyDataSetChanged(); } catch (JSONException | UnsupportedEncodingException e) { e.printStackTrace(); } }，因为我在RecyclerAdapter的{{1}}方法中看不到任何创建listItems的代码。

onCreate()

Answer 6

不要将列表对象从activity传递给适配器。而是在适配器中有一个单独的数组列表。将适配器构造函数更改为：

     public RecycleAdapter(List<OrderListItem> listItems, Context context) {
         this.listItems = new ArrayList<>(listItems);
         this.context = context;
    }

正如Maddy建议在适配器中使用setMethod传递listitem数组并向其添加所有项目并调用notifyDataSetChanged。

我想这可以解决您在活动和适配器中不使用相同的listitems对象时的问题。

添加

6 个答案: