java-未填充RecyclerView(getItemCount()返回零)

概述我查看了关于此的其他问题,并逐字地匹配了代码,但是我一定错过了一些东西,因为没有任何效果.getItemCount()返回零,但是我调试了数据列表,似乎可以正确添加所有数据,因此与适配器的通信出现了问题.请告诉我这里出了什么问题！下面是我的MainActivity.java代码：importandroid.con

我查看了关于此的其他问题,并逐字地匹配了代码,但是我一定错过了一些东西,因为没有任何效果. getItemCount()返回零,但是我调试了数据列表,似乎可以正确添加所有数据,因此与适配器的通信出现了问题.

请告诉我这里出了什么问题！

下面是我的MainActivity.java代码：

import androID.content.Context;import androID.content.Intent;import androID.support.v7.app.ActionBaractivity;import androID.os.Bundle;import androID.support.v7.Widget.linearlayoutmanager;import androID.support.v7.Widget.RecyclerVIEw;import androID.util.Log;import androID.vIEw.VIEw;import androID.Widget.button;import com.parse.FindCallback;import com.parse.ParseException;import com.parse.ParSEObject;import com.parse.Parsequery;import com.parse.ParseUser;import java.util.ArrayList;import java.util.List;public class Profile_Page extends ActionBaractivity {    UserLocalStore userLocalStore;    private RecyclerVIEw recyclerVIEw;    private DataAdapter adapter;    private Context context;    final linearlayoutmanager layoutManager = new linearlayoutmanager(this);    public List<information> data = new ArrayList<>();    @OverrIDe    protected voID onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_profile__page);        ParseUser currentUser = ParseUser.getCurrentUser();        String struser = currentUser.getUsername();        recyclerVIEw = (RecyclerVIEw) findVIEwByID(R.ID.recyclerVIEw);         button logoutBtn = (button) findVIEwByID(R.ID.logoutBtn);        adapter = new DataAdapter(getApplicationContext(), getData());         recyclerVIEw.setAdapter(adapter);         recyclerVIEw.setLayoutManager(new linearlayoutmanager(getApplicationContext()));   public List<information> getData(){    Parsequery <ParSEObject> query = Parsequery.getquery("ParseClassname");        query.whereEqualTo("author", ParseUser.getCurrentUser());        query.findInBackground(new FindCallback<ParSEObject>() {            @OverrIDe            public voID done(List<ParSEObject> List, ParseException e) {                 if (e == null) {                    for (ParSEObject getData : List) {                         information current = new information();                        current.thing= getData.getString("Thing");                                                                   data.add(current);                         adapter.notifyDataSetChanged();                        //for some reason, data isn't getting transferred to adapter                    }                } else {                    //something went wrong                }            }        });return data;    }    public voID logout(VIEw vIEw)    {        // logout current user        ParseUser.logout();        finish();    }}

DataAdapter的代码：

import androID.content.Context;import androID.support.v7.Widget.RecyclerVIEw;import androID.util.Log;import androID.vIEw.LayoutInflater;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import androID.Widget.button;import androID.Widget.Chronometer;import androID.Widget.EditText;import androID.Widget.TextVIEw;import java.util.ArrayList;import java.util.Collections;import java.util.List;public class DataAdapter extends RecyclerVIEw.Adapter<DataAdapter.MyVIEwHolder>{    private LayoutInflater inflater;    List<information> data = Collections.emptyList();    public DataAdapter(Context context, List<information> data)     {        inflater = LayoutInflater.from(context);        this.data= data;    }    @OverrIDe    public MyVIEwHolder onCreateVIEwHolder(VIEwGroup parent, int vIEwType)    {        VIEw vIEw = inflater.inflate(R.layout.recycler_vIEw_layout, parent, false);         MyVIEwHolder holder = new MyVIEwHolder(vIEw);         return holder;    }    @OverrIDe    public voID onBindVIEwHolder(MyVIEwHolder holder, int position)    {        information current = data.get(position);        holder.tv.setText(current.thing);    }    @OverrIDe    public int getItemCount()    {   Log.d("datasize", String.valueOf(data.size()));        return data.size();    }    class MyVIEwHolder extends RecyclerVIEw.VIEwHolder    {    TextVIEw tv;        public MyVIEwHolder(VIEw itemVIEw) {            super(itemVIEw);            tv= (TextVIEw) itemVIEw.findVIEwByID(R.ID.thingID);        }    }}

information.java

public class information{    public String thing;}

Recycler_vIEw_layout.xml

<?xml version="1.0" enCoding="utf-8"?><linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"    androID:orIEntation="horizontal" androID:layout_wIDth="match_parent"    androID:layout_height="match_parent"    >    <TextVIEw        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:text="Dummy Text"        androID:ID="@+ID/thingID"/></linearLayout>

添加了RecyclerVIEw的活动：

<relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"    xmlns:tools="http://schemas.androID.com/tools" androID:layout_wIDth="match_parent"    androID:layout_height="match_parent" androID:paddingleft="@dimen/activity_horizontal_margin"    androID:paddingRight="@dimen/activity_horizontal_margin"    androID:paddingtop="@dimen/activity_vertical_margin"    androID:paddingBottom="@dimen/activity_vertical_margin"    tools:context="com.example.androID.blah.Profile_Page"    >    <button        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:text="button"        androID:ID="@+ID/button3"        androID:layout_alignParenttop="true"        androID:layout_alignRight="@+ID/recyclerVIEw"        androID:layout_alignEnd="@+ID/recyclerVIEw" />    <button        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:text="Log out"        androID:ID="@+ID/logoutBtn"        androID:layout_below="@+ID/button3"        androID:layout_alignParentleft="true"        androID:layout_alignParentStart="true"        androID:onClick="logout"        androID:layout_margintop="85dp" />    <androID.support.v7.Widget.RecyclerVIEw        androID:layout_wIDth="match_parent"        androID:layout_height = "wrap_content"        androID:ID="@+ID/recyclerVIEw"        androID:layout_aligntop="@ID/logoutBtn" /></relativeLayout>

解决方法:

也许如果您在完成的方法中设置适配器,它将起作用.将底部插入循环.

adapter = new DataAdapter(getApplicationContext(), data); recyclerVIEw.setAdapter(adapter); recyclerVIEw.setLayoutManager(new linearlayoutmanager(getApplicationContext()));

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