Java 无法在RecyclerView上显示数据
我正在学习这方面的教程。但是当我从firebase检索数据时,我的应用程序被破坏了。对于以前的教程,一切顺利,没有错误。就为了这个话题,我的应用程序崩溃了。我的所有代码都与教程中的相同 UserActivity.javaJava 无法在RecyclerView上显示数据,java,android,Java,Android,我正在学习这方面的教程。但是当我从firebase检索数据时,我的应用程序被破坏了。对于以前的教程,一切顺利,没有错误。就为了这个话题,我的应用程序崩溃了。我的所有代码都与教程中的相同 UserActivity.java package com.bertho.chat; import android.app.ProgressDialog; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; imp
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();
}
}
package com.bertho.chat;
导入android.app.ProgressDialog;
导入android.os.Bundle;
导入android.support.v7.app.AppActivity;
导入android.support.v7.widget.LinearLayoutManager;
导入android.support.v7.widget.RecyclerView;
导入android.support.v7.widget.Toolbar;
导入android.view.view;
导入android.widget.TextView;
导入com.firebase.ui.database.FirebaseRecyclerAdapter;
导入com.google.firebase.database.DatabaseReference;
导入com.google.firebase.database.FirebaseDatabase;
公共类UsersActivity扩展了AppCompatActivity{
私有工具栏mToolbar;
私人回收站查看博物馆列表;
私有数据库参考mUsersDatabase;
私人住宅;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_用户);
mDialog=新建进度对话框(此对话框);
mToolbar=(工具栏)findviewbyd(R.id.Toolbar);
设置支持操作栏(mToolbar);
getSupportActionBar().setTitle(“用户列表”);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mUsersDatabase=FirebaseDatabase.getInstance().getReference().child(“用户”);
mUsersList=(RecyclerView)findViewById(R.id.users\u列表);
mUsersList.setHasFixedSize(true);
mUsersList.setLayoutManager(新的LinearLayoutManager(本));
}
@凌驾
受保护的void onStart(){
super.onStart();
显示加载(“获取所有用户数据”);
FirebaseRecyclerAdapter FirebaseRecyclerAdapter=新的FirebaseRecyclerAdapter(
用户.class,
R.layout.users\u single\u布局,
UsersViewHolder.class,
缪斯数据库
) {
@凌驾
受保护的void populateViewHolder(UsersViewHolder UsersViewHolder,Users Users,int位置){
usersViewHolder.setDisplayName(users.getName());
mDialog.discouse();
}
};
mUsersList.setAdapter(firebaseRecyclerAdapter);
}
公共静态类UsersViewHolder扩展了RecyclerView.ViewHolder{
视图视图;
公共用户查看文件夹(查看项目视图){
超级(项目视图);
mView=项目视图;
}
public void setDisplayName(字符串名称){
TextView用户名视图=(TextView)mView.findviewbyd(R.id.user\u single\u name);
userNameView.setText(名称);
}
}
私有void显示加载(字符串s){
mDialog.setTitle(“请稍候”);
mDialog.setMessage;
mDialog.SetCanceledOnTouchOut(假);
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>
我的代码有什么错误或遗漏吗?请帮助您的CircularImageView
没有膨胀,并且存在很多问题,解决方案请使用类似hdodenhof CircularImageView的替代库
将此添加到您的依赖项:
compile 'de.hdodenhof:circleimageview:2.1.0'
并添加如下视图:
<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"/>
根据堆栈跟踪,CircularImageView
无法充气。也许有帮助。
<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"/>