无法在 RecyclerView 上显示数据

Question

我正在关注这个Lapit Chat App - All Users Activity - Firebase Tutorials - Part 14 的教程。但是在从 firebase 检索数据时，我的应用程序被损坏了。对于以前的教程，一切顺利，没有错误。仅针对此主题，我的应用程序崩溃了。而且我所有的代码都和教程里的一样。

UserActivity.java

package com.bertho.chat;

import android.app.ProgressDialog;
import android.os.Bundle;
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.view.View;
import android.widget.TextView;

import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

public class UsersActivity extends AppCompatActivity {

    private Toolbar mToolbar;
    private RecyclerView mUsersList;
    private DatabaseReference mUsersDatabase;
    private ProgressDialog mDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_users);

        mDialog = new ProgressDialog(this);

        mToolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(mToolbar);
        getSupportActionBar().setTitle("User List");
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        mUsersDatabase = FirebaseDatabase.getInstance().getReference().child("Users");

        mUsersList = (RecyclerView) findViewById(R.id.users_list);
        mUsersList.setHasFixedSize(true);
        mUsersList.setLayoutManager(new LinearLayoutManager(this));

    }

    @Override
    protected void onStart() {
        super.onStart();

        showLoading("Get all user data");

        FirebaseRecyclerAdapter<Users, UsersViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Users, UsersViewHolder>(
                Users.class,
                R.layout.users_single_layout,
                UsersViewHolder.class,
                mUsersDatabase
        ) {
            @Override
            protected void populateViewHolder(UsersViewHolder usersViewHolder, Users users, int position) {
                usersViewHolder.setDisplayName(users.getName());
                mDialog.dismiss();
            }
        };

        mUsersList.setAdapter(firebaseRecyclerAdapter);
    }

    public static class UsersViewHolder extends RecyclerView.ViewHolder {

        View mView;

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

            mView = itemView;
        }

        public void setDisplayName(String name) {
            TextView userNameView = (TextView) mView.findViewById(R.id.user_single_name);
            userNameView.setText(name);
        }
    }

    private void showLoading(String s) {
        mDialog.setTitle("Please waiting");
        mDialog.setMessage(s);
        mDialog.setCanceledOnTouchOutside(false);
        mDialog.show();
    }
}

activity_users.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.bertho.chat.UsersActivity">

    <include layout="@layout/app_bar_layout"
        android:id="@+id/user_appBar">
    </include>

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

</RelativeLayout>

users_single_layout.xml

<?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:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dp"
    android:background="@color/bgAbuAbu">

    <android.support.v4.widget.CircleImageView
        android:id="@+id/user_single_image"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_margin="10dp"
        android:src="@drawable/notfound" />

    <TextView
        android:id="@+id/user_single_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/user_single_image"
        android:layout_marginTop="14dp"
        android:layout_toEndOf="@+id/user_single_image"
        android:layout_toRightOf="@+id/user_single_image"
        android:text="User default name!"
        android:textColor="@android:color/black"
        android:textSize="16sp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/user_single_status"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/user_single_name"
        android:layout_marginTop="11dp"
        android:layout_toEndOf="@+id/user_single_image"
        android:layout_toRightOf="@+id/user_single_image"
        android:text="User default status!" />

</RelativeLayout>

还有我的 错误日志 on android studio https://pastebin.com/UKhPswXQ

我的代码有什么错误或遗漏吗？请帮忙

Answer 1

你的CircularImageView 没有膨胀，有很多问题，解决方案使用替代库，如hdodenhof CircularImageView link

将此添加到您的依赖项中：

compile 'de.hdodenhof:circleimageview:2.1.0'

并像这样添加视图：

<de.hdodenhof.circleimageview.CircleImageView
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/profile_image"
    android:layout_width="96dp"
    android:layout_height="96dp"
    android:src="@drawable/profile"
    app:civ_border_width="2dp"
    app:civ_border_color="#FF000000"/>