我正在添加firebase google和Gmail登录但是当我粘贴我的代码时 onAuthStateChanged（@NonNull FirebaseAuth firebaseAuth）方法我收到此错误
无法解析符号'AuthUI'
在AuthUI字上，所有AuthUI字都显示为红色 onAuthStateChanged（@NonNull FirebaseAuth firebaseAuth）方法。
MainActivity代码
Map.Entry<String,String>FriendlyMessage.java代码
package com.google.firebase.udacity.friendlychat;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.text.Editable;
import android.text.InputFilter;
import android.text.TextWatcher;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.ProgressBar;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
public static final String ANONYMOUS = "anonymous";
public static final int DEFAULT_MSG_LENGTH_LIMIT = 1000;
public static final int RC_SIGN_IN=1;
private ListView mMessageListView;
private MessageAdapter mMessageAdapter;
private ProgressBar mProgressBar;
private ImageButton mPhotoPickerButton;
private EditText mMessageEditText;
private Button mSendButton;
private String mUsername;
private FirebaseDatabase database;
private DatabaseReference databaserefrence;
private ChildEventListener databaselistener;
private FirebaseAuth auth;
private FirebaseAuth.AuthStateListener auhtlistener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mUsername = ANONYMOUS;
database = FirebaseDatabase.getInstance();
databaserefrence= database.getReference().child("messages");
auth= FirebaseAuth.getInstance();
// Initialize references to views
mProgressBar = (ProgressBar) findViewById(R.id.progressBar);
mMessageListView = (ListView) findViewById(R.id.messageListView);
mPhotoPickerButton = (ImageButton) findViewById(R.id.photoPickerButton);
mMessageEditText = (EditText) findViewById(R.id.messageEditText);
mSendButton = (Button) findViewById(R.id.sendButton);
// Initialize message ListView and its adapter
List<FriendlyMessage> friendlyMessages = new ArrayList<>();
mMessageAdapter = new MessageAdapter(this, R.layout.item_message, friendlyMessages);
mMessageListView.setAdapter(mMessageAdapter);
// Initialize progress bar
mProgressBar.setVisibility(ProgressBar.INVISIBLE);
// ImagePickerButton shows an image picker to upload a image for a message
mPhotoPickerButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// TODO: Fire an intent to show an image picker
}
});
// Enable Send button when there's text to send
mMessageEditText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
if (charSequence.toString().trim().length() > 0) {
mSendButton.setEnabled(true);
} else {
mSendButton.setEnabled(false);
}
}
@Override
public void afterTextChanged(Editable editable) {
}
});
mMessageEditText.setFilters(new InputFilter[]{new InputFilter.LengthFilter(DEFAULT_MSG_LENGTH_LIMIT)});
// Send button sends a message and clears the EditText
mSendButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// TODO: Send messages on click
FriendlyMessage friendlyMessage = new FriendlyMessage(mMessageEditText.getText().toString(), mUsername, null);
databaserefrence.push().setValue(friendlyMessage);
// Clear input box
mMessageEditText.setText("");
}
});
databaselistener= new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s)
{
mMessageAdapter.add(dataSnapshot.getValue(FriendlyMessage.class));
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
};
databaserefrence.addChildEventListener(databaselistener);
auhtlistener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth)
{
FirebaseUser user = firebaseAuth.getCurrentUser();
if(user!=null)
{
}
else
{
startActivityForResult(
AuthUI.getInstance()
.createSignInIntentBuilder()
.setAvailableProviders(
Arrays.asList(new AuthUI.IdpConfig.Builder(AuthUI.EMAIL_PROVIDER).build(),
new AuthUI.IdpConfig.Builder(AuthUI.PHONE_VERIFICATION_PROVIDER).build(),
new AuthUI.IdpConfig.Builder(AuthUI.GOOGLE_PROVIDER).build(),
new AuthUI.IdpConfig.Builder(AuthUI.FACEBOOK_PROVIDER).build(),
new AuthUI.IdpConfig.Builder(AuthUI.TWITTER_PROVIDER).build()))
.build(),
RC_SIGN_IN);
}
}
};
auth.addAuthStateListener(auhtlistener);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
}
邮件适配器类的代码
package com.google.firebase.udacity.friendlychat;
public class FriendlyMessage {
private String text;
private String name;
private String photoUrl;
public FriendlyMessage()
{
}
public FriendlyMessage(String text, String name, String photoUrl) {
this.text = text;
this.name = name;
this.photoUrl = photoUrl;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPhotoUrl() {
return photoUrl;
}
public void setPhotoUrl(String photoUrl) {
this.photoUrl = photoUrl;
}
}
build.gradle代码（项目：friendlyChat）
package com.google.firebase.udacity.friendlychat;
import android.app.Activity;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import java.util.List;
public class MessageAdapter extends ArrayAdapter<FriendlyMessage> {
public MessageAdapter(Context context, int resource, List<FriendlyMessage> objects) {
super(context, resource, objects);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = ((Activity) getContext()).getLayoutInflater().inflate(R.layout.item_message, parent, false);
}
ImageView photoImageView = (ImageView) convertView.findViewById(R.id.photoImageView);
TextView messageTextView = (TextView) convertView.findViewById(R.id.messageTextView);
TextView authorTextView = (TextView) convertView.findViewById(R.id.nameTextView);
FriendlyMessage message = getItem(position);
boolean isPhoto = message.getPhotoUrl() != null;
if (isPhoto) {
messageTextView.setVisibility(View.GONE);
photoImageView.setVisibility(View.VISIBLE);
Glide.with(photoImageView.getContext())
.load(message.getPhotoUrl())
.into(photoImageView);
} else {
messageTextView.setVisibility(View.VISIBLE);
photoImageView.setVisibility(View.GONE);
messageTextView.setText(message.getText());
}
authorTextView.setText(message.getName());
return convertView;
}
}
build.gradle代码（模块：应用）
buildscript {
repositories {
jcenter()
mavenLocal()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.2.2' //alrae
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
classpath 'com.google.gms:google-services:3.0.0' //already
}
}
allprojects {
repositories {
jcenter()
mavenLocal()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
答案 0 :(得分：2)
FirebaseUI Version Firebase/Play Services Version
2.3.0 11.0.4
您应该在build.gradle部分添加此内容。
compile 'com.firebaseui:firebase-ui-auth:2.3.0'
答案 1 :(得分：1)
您应该在build.gradle部分添加它。
compile 'com.github.bumptech.glide:glide:3.6.1'
compile 'com.google.firebase:firebase-core:9.6.1'
compile 'com.google.firebase:firebase-database:9.6.1'
compile 'com.google.firebase:firebase-auth:9.6.1'
compile 'com.firebaseui:firebase-ui-auth:0.6.1'
compile 'com.google.firebase:firebase-storage:9.6.1'
compile 'com.google.firebase:firebase-messaging:9.6.1'
compile 'com.google.firebase:firebase-config:9.6.1'
答案 2 :(得分：0)
这令人困惑，但您必须实现2个Firebase库才能使用UI。
implementation 'com.google.firebase:firebase-auth:16.1.0'
implementation 'com.firebaseui:firebase-ui-auth:4.1.0'
答案 3 :(得分：0)
仅需在build.gradle上添加以下行
实现'com.firebaseui：firebase-ui-auth：6.2.0'