我正在尝试使用以下教程在android studio中创建聊天应用程序： https://code.tutsplus.com/tutorials/how-to-create-an-android-chat-app-using-firebase--cms-27397
据我所知，我完全按照他说的做，但是我的应用程序在输入电子邮件后崩溃。
我检查了日志猫，但找不到任何有用的东西。
MainActivity.java
public class MainActivity extends AppCompatActivity {
private static final int SIGN_IN_REQUEST_CODE = 111;
private FirebaseListAdapter<ChatMessage> adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(FirebaseAuth.getInstance().getCurrentUser() == null) {
// Start sign in/sign up activity
startActivityForResult(AuthUI.getInstance().createSignInIntentBuilder().build(), SIGN_IN_REQUEST_CODE);
} else {
// User is already signed in. Therefore, display
// a welcome Toast
Toast.makeText(this, "Welcome " + FirebaseAuth.getInstance().getCurrentUser().getDisplayName(), Toast.LENGTH_LONG).show();
// Load chat room contents
displayChatMessages();
}
FloatingActionButton fab = findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
EditText input = findViewById(R.id.input);
// Read the input field and push a new instance
// of ChatMessage to the Firebase database
FirebaseDatabase.getInstance().getReference().push().setValue(new ChatMessage(input.getText().toString(), FirebaseAuth.getInstance().getCurrentUser().getDisplayName()));
// Clear the input
input.setText("");
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == SIGN_IN_REQUEST_CODE) {
if(resultCode == RESULT_OK) {
Toast.makeText(this, "Successfully signed in. Welcome!", Toast.LENGTH_LONG).show();
displayChatMessages();
} else {
Toast.makeText(this, "We couldn't sign you in. Please try again later.", Toast.LENGTH_LONG).show();
// Close the app
finish();
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId() == R.id.menu_sign_out) {
AuthUI.getInstance().signOut(this).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
Toast.makeText(MainActivity.this, "You have been signed out.", Toast.LENGTH_LONG).show();
// Close activity
finish();
}
});
}
return true;
}
private void displayChatMessages() {
ListView listOfMessages = findViewById(R.id.list_of_messages);
adapter = new FirebaseListAdapter<ChatMessage>(this, ChatMessage.class, R.layout.message, FirebaseDatabase.getInstance().getReference()) {
@Override
protected void populateView(View v, ChatMessage model, int position) {
// Get references to the views of message.xml
TextView messageText = v.findViewById(R.id.message_text);
TextView messageUser = v.findViewById(R.id.message_user);
TextView messageTime = v.findViewById(R.id.message_time);
// Set their text
messageText.setText(model.getMessageText());
messageUser.setText(model.getMessageUser());
// Format the date before showing it
messageTime.setText(DateFormat.format("dd-MM-yyyy (HH:mm:ss)", model.getMessageTime()));
}
};
listOfMessages.setAdapter(adapter);
}
}
ChatMessage.java
public class ChatMessage {
private String messageText;
private String messageUser;
private long messageTime;
public ChatMessage(String messageText, String messageUser) {
this.messageText = messageText;
this.messageUser = messageUser;
// Initialize to current time
messageTime = new Date().getTime();
}
public ChatMessage(){
}
public String getMessageText() {
return messageText;
}
public void setMessageText(String messageText) {
this.messageText = messageText;
}
public String getMessageUser() {
return messageUser;
}
public void setMessageUser(String messageUser) {
this.messageUser = messageUser;
}
public long getMessageTime() {
return messageTime;
}
public void setMessageTime(long messageTime) {
this.messageTime = messageTime;
}
}
Logcat
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.metalDent.mychatapp, PID: 27237
java.lang.NoSuchMethodError: No virtual method fetchProvidersForEmail(Ljava/lang/String;)Lcom/google/android/gms/tasks/Task; in class Lcom/google/firebase/auth/FirebaseAuth; or its super classes (declaration of 'com.google.firebase.auth.FirebaseAuth' appears in /data/app/com.metalDent.mychatapp-RmMfp5EHXBs_NAwFfRcLJw==/split_lib_dependencies_apk.apk)
at com.firebase.ui.auth.ui.email.CheckEmailFragment.checkAccountExists(CheckEmailFragment.java:183)
at com.firebase.ui.auth.ui.email.CheckEmailFragment.validateAndProceed(CheckEmailFragment.java:174)
at com.firebase.ui.auth.ui.email.CheckEmailFragment.onClick(CheckEmailFragment.java:262)
at android.view.View.performClick(View.java:6294)
at android.view.View$PerformClick.run(View.java:24770)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
答案 0 :(得分：1)
在build.gradle文件中添加以下依赖项：
implementation 'com.google.firebase:firebase-auth:**17.0.0**'
因为身份验证版本为17.0.0
希望您会找到解决方案。
答案 1 :(得分：0)
fetchProvidersForEmail已过时。您应该改用fetchSignInMethodsForEmail。
答案 2 :(得分：0)
我已经通过添加gradle依赖项解决了这个问题：
dependencies {
...
implementation 'com.firebaseui:firebase-ui-auth:4.3.1'
...
}