Question

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)

Answer 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。

Answer 2

fetchProvidersForEmail已过时。您应该改用fetchSignInMethodsForEmail。

Answer 3

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'
   ...
   }

java.lang.NoSuchMethodError是什么：没有虚拟方法fetchProvidersForEmail（Ljava / lang / String;）Lcom / google / android / gms / tasks / Task;意思？

3 个答案: