firebaseRecyclerAdapter 已填充，但不会在对话框中显示任何内容 - Android Studio

Question

因此，我尝试使用 firebaseRecyclerAdapter 将 recyclerView 放入 "popup" 对话框中。我的问题是，我确定适配器已满，因为我使用 Logcat 告诉我它何时向适配器添加另一个 "user"，但它不会在对话框的回收视图中显示任何内容.

我已经遇到这个问题好几天了，还没有找到答案，很高兴你能帮我 :)

我正在使用更改片段的主屏幕，并从某个片段调用此特定对话框。

这些是我的文件： UserViewHolder - class 持有卡片视图的 "sets"：

public static class UserViewHolder extends RecyclerView.ViewHolder
    {
        View mView;
        public UserViewHolder(View itemView)
        {
            super(itemView);
            mView=itemView;
        }
        public void setName(String name)
        {
            TextView teacherName=(TextView) mView.findViewById(R.id.txtNameTea);
            teacherName.setText(name);
        }
        public void setEmail(String email)
        {
            TextView txtEmailTea=(TextView) mView.findViewById(R.id.txtEmailTea);
            txtEmailTea.setText(email);
        }
        public void setImage(final Context ctx, Uri imageUri, User cUser)
        {
            final ImageView imgProfileTea=(ImageView) mView.findViewById(R.id.imgProfileTea);

            Picasso.with(ctx).load(cUser.getImageUri()).into(imgProfileTea);
            if(imgProfileTea.getDrawable()==null) {
                StorageReference load = FirebaseStorage.getInstance().getReference().child("usersProfilePic/" + cUser.getImageName());
                load.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
                    @Override
                    public void onSuccess(Uri uri) {

                        Picasso.with(ctx).load(uri.toString()).into(imgProfileTea);
                    }
                }).addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Toast.makeText(ctx, e.getMessage(), Toast.LENGTH_LONG);
                    }

                });
            }

        }
    }

Schedules - 从其工具栏调用对话框的片段：

package com.example.android.aln4;

import android.app.ActionBar;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.github.sundeepk.compactcalendarview.CompactCalendarView;
import com.github.sundeepk.compactcalendarview.domain.Event;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.storage.FirebaseStorage;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Locale;

import static com.example.android.aln4.LoginActivity.myUser;
import static com.example.android.aln4.dataBase.mDatabaseReference;
import static com.example.android.aln4.dataBase.mFirebaseDatabase;
import static com.example.android.aln4.dataBase.mStorageRef;
import static com.example.android.aln4.navDrawerMain.firebaseRecyclerAdapter;
import static java.lang.System.in;
import static com.example.android.aln4.navDrawerMain.studentsQuery;

public class Schedules extends Fragment {

    private Toolbar ScheduleToolbar;
    private Button addEvent;
    //private TextView txt;

    private RecyclerView mRecyclerViewStudentEvent;

    private CompactCalendarView compactCalendar;
    private SimpleDateFormat dateFormatMonth = new SimpleDateFormat("MMMM-yyyy", Locale.getDefault());

    private String[] monthName = {"January", "February", "March", "April", "May", "June", "July",
            "August", "September", "October", "November", "December"};


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {
            case R.id.addEvent:
                final AlertDialog.Builder mBuilder = new AlertDialog.Builder(getContext());
                View mView = getLayoutInflater().inflate(R.layout.dialog_event_creation, null);
                mRecyclerViewStudentEvent = (RecyclerView) mView.findViewById(R.id.mRecyclerViewStudentEvent);
                mRecyclerViewStudentEvent.setHasFixedSize(true);
                mRecyclerViewStudentEvent.setLayoutManager(new LinearLayoutManager(getContext()));


                setStudentsList();
                mView = getLayoutInflater().inflate(R.layout.dialog_event_creation, null);
                final EditText edtEventTitle = (EditText) mView.findViewById(R.id.edtEventTitle);
                final TextView txtEventStartTime = (TextView) mView.findViewById(R.id.txtEventStartTime);
                final TextView txtEventEndTime = (TextView) mView.findViewById(R.id.txtEventEndTime);
                final EditText edtEventLocation = (EditText) mView.findViewById(R.id.edtEventLocation);
                Button btnOfferEvent = (Button) mView.findViewById(R.id.btnOfferEvent);
                mBuilder.setView(mView);
                final AlertDialog dialog = mBuilder.create();


                btnOfferEvent.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Calendar startTime = Calendar.getInstance();
                        Calendar endTime = Calendar.getInstance();
                        int startHour = Integer.parseInt(txtEventStartTime.getText().toString().substring(0, 2));
                        int startMinute = Integer.parseInt(txtEventStartTime.getText().toString().substring(3, 5));
                        startTime.set(Calendar.HOUR_OF_DAY, startHour);
                        startTime.set(Calendar.MINUTE, startMinute);
                        int endHour = Integer.parseInt(txtEventEndTime.getText().toString().substring(0, 2));
                        int endMinute = Integer.parseInt(txtEventEndTime.getText().toString().substring(3, 5));
                        endTime.set(Calendar.HOUR_OF_DAY, endHour);
                        endTime.set(Calendar.MINUTE, endMinute);
                        String mId =/*dataSelected+*/ String.valueOf(startHour) + String.valueOf(startMinute);//+selectedUserID
                        EventCreation newEvent = new EventCreation(mId, startTime, endTime, edtEventTitle.getText().toString(), edtEventLocation.getText().toString(), R.color.colorPrimary);
                        dialog.dismiss();
                    }
                });
                dialog.show();
                break;
            default:
                break;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        setHasOptionsMenu(true);
        ScheduleToolbar = (Toolbar) getView().findViewById(R.id.schedule_toolbar);
        // Setting toolbar as the ActionBar with setSupportActionBar() call
        ((AppCompatActivity) getActivity()).setSupportActionBar(ScheduleToolbar);

        mFirebaseDatabase = FirebaseDatabase.getInstance();
        mDatabaseReference = mFirebaseDatabase.getReference("users");
        mStorageRef = FirebaseStorage.getInstance().getReference();

        Calendar cal = Calendar.getInstance();
        String month = monthName[cal.get(Calendar.MONTH)];
        int year = cal.get(Calendar.YEAR);

        getActivity().setTitle(month + "-" + year);

        compactCalendar = (CompactCalendarView) getView().findViewById(R.id.compactcalendar_view);
        compactCalendar.setUseThreeLetterAbbreviation(true);


        long millis = System.currentTimeMillis() % 1000;
        Event ev1 = new Event(Color.RED, millis, "First try");
        compactCalendar.addEvent(ev1);

        compactCalendar.setListener(new CompactCalendarView.CompactCalendarViewListener() {
            @Override
            public void onDayClick(Date dateClicked) {
                //put events into scroll view adapter

            }

            @Override
            public void onMonthScroll(Date firstDayOfNewMonth) {
                getActivity().setTitle(dateFormatMonth.format(firstDayOfNewMonth));

            }
        });

    }


    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.schedules, container, false);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.menu_main, menu);
    }

    private void setStudentsList() {

        studentsQuery=mDatabaseReference.orderByChild("teacherNum").equalTo(myUser.getTeacherNum());
        firebaseRecyclerAdapter=new FirebaseRecyclerAdapter<User, navDrawerMain.UserViewHolder>(
                User.class,R.layout.card_view_teacher,navDrawerMain.UserViewHolder.class,studentsQuery) {
            @Override
            protected void populateViewHolder(navDrawerMain.UserViewHolder viewHolder, User model, int position) {
                viewHolder.setName(model.getFirstName() + " " + model.getLastName());
                viewHolder.setEmail(model.getEmail());
                viewHolder.setImage(getContext(), Uri.parse(model.getImageUri()), model);
            }
        };

        mRecyclerViewStudentEvent.setAdapter(firebaseRecyclerAdapter);
}


}

对话框xml文件：

<?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">
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

    </RelativeLayout>
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <ImageView
            android:layout_width="50dp"
            android:layout_height="20dp"
            android:layout_alignParentRight="true"
            android:layout_marginTop="20dp"
            android:src="@mipmap/title"/>
    <EditText
        android:id="@+id/edtEventTitle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="כותרת"
        android:layout_marginRight="50dp"/>
        <android.support.v7.widget.RecyclerView
            android:layout_marginTop="50dp"
            android:id="@+id/mRecyclerViewStudentEvent"
            android:layout_alignParentRight="true"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">

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

    </RelativeLayout>



    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:layout_marginTop="20dp"
        android:orientation="vertical">

        <ImageView
            android:layout_width="50dp"
            android:layout_height="20dp"
            android:layout_alignParentRight="true"
            android:layout_marginTop="20dp"
            android:src="@mipmap/clock"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_marginRight="50dp"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:text="שעת התחלה"
            android:textSize="20dp" />

        <TextView
            android:id="@+id/txtEventStartTime"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="50dp"
            android:layout_marginTop="5dp"
            android:text="21:00" />

        <View
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:layout_marginTop="25dp"
            android:layout_marginRight="50dp"
            android:background="@color/darkgray" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="50dp"
            android:layout_alignParentRight="true"
            android:layout_marginTop="26dp"
            android:text="שעת סיום"
            android:textSize="20dp" />

        <TextView
            android:id="@+id/txtEventEndTime"
            android:layout_width="match_parent"
            android:layout_marginRight="50dp"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_marginLeft="5dp"
            android:layout_marginTop="30dp"
            android:text="21:45" />

    </RelativeLayout>

    <RelativeLayout
        android:layout_marginTop="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <ImageView
            android:layout_width="50dp"
            android:layout_height="20dp"
            android:layout_alignParentRight="true"
            android:layout_marginTop="20dp"
            android:src="@mipmap/location"/>
        <EditText
            android:id="@+id/edtEventLocation"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="מיקום תחילת השיעור"
            android:layout_marginRight="50dp"/>

    </RelativeLayout>

    <Button
        android:id="@+id/btnOfferEvent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="100dp"
        android:layout_gravity="center_horizontal"
        android:text="הצע שיעור"/>



</LinearLayout>

我知道的另一件事是，我已经能够将用户带入其他片段中的 recyclerView。这是另一个片段中的代码：

package com.example.android.aln4;

import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.storage.FirebaseStorage;

import static com.example.android.aln4.dataBase.mDatabaseReference;
import static com.example.android.aln4.dataBase.mFirebaseDatabase;
import static com.example.android.aln4.dataBase.mStorageRef;
import static com.example.android.aln4.navDrawerMain.firebaseRecyclerAdapter;
import static com.example.android.aln4.navDrawerMain.teachersQuery;

public class TeachersList extends Fragment {

    private RecyclerView mRecyclerViewTeacher;

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        getActivity().setTitle("מורים");
        mFirebaseDatabase = FirebaseDatabase.getInstance();
        mDatabaseReference = mFirebaseDatabase.getReference("users");
        mStorageRef = FirebaseStorage.getInstance().getReference();
        mRecyclerViewTeacher=(RecyclerView) getView().findViewById(R.id.mRecyclerViewTeacher);
        mRecyclerViewTeacher.setHasFixedSize(true);
        mRecyclerViewTeacher.setLayoutManager(new LinearLayoutManager(getContext()));
        setTeachersList();


    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.teachers_list_frag,container,false);
    }

    private void setTeachersList() {
        teachersQuery=mDatabaseReference.orderByChild("type").equalTo("Teacher");
        firebaseRecyclerAdapter=new FirebaseRecyclerAdapter<User, navDrawerMain.UserViewHolder>(
                User.class,R.layout.card_view_teacher,navDrawerMain.UserViewHolder.class,teachersQuery) {
            @Override
            protected void populateViewHolder(navDrawerMain.UserViewHolder viewHolder, User model, int position) {
                viewHolder.setName(model.getFirstName()+" "+model.getLastName());
                viewHolder.setEmail(model.getEmail());
                viewHolder.setImage(getContext(), Uri.parse(model.getImageUri()),model);
            }
        };
        mRecyclerViewTeacher.setAdapter(firebaseRecyclerAdapter);

    }

}

及其 xml 文件：

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


    <android.support.v7.widget.RecyclerView
        android:id="@+id/mRecyclerViewTeacher"
        android:layout_marginTop="57dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

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




</RelativeLayout>

这是我的第一个问题，如果我遗漏了什么，我深表歉意:) 如有任何帮助，我们将不胜感激。

Answer 1

已解决。我所做的只是在 firebase 设置中重新生成 SHA1，并从 Schedules activity 中删除 setHasFixedSize 行，它工作得很好。

firebaseRecyclerAdapter 已填充，但不会在对话框中显示任何内容 - Android Studio

firebaseRecyclerAdapter gets filled, yet wont show anything in a dialog - Android Studio

android

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android-fragments

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