java - 错误:找不到符号类FirebaseInstanceIdService

    public class LoginActivity extends AppCompatActivity {

    private static final int RC_SIGN_IN = 1;

    @BindView(R.id.activity_login_google_button)
    SignInButton googleButton;
    @BindView(R.id.activity_login_progress)
    ProgressBar progress;

    private GoogleApiClient mGoogleApiClient;
    private FirebaseAuth.AuthStateListener mAuthListener;
    private FirebaseAuth mAuth;

    @State
    boolean isLoading;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        ButterKnife.bind(this);
        Icepick.restoreInstanceState(this, savedInstanceState);

        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .requestIdToken(getString(R.string.default_web_client_id))
                .build();

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build();

        mAuth = FirebaseAuth.getInstance();

        mAuthListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if (user != null) {
                    // User is signed in
                    Log.d("@@@@", "onAuthStateChanged:signed_in:" + user.getUid());
                    Intent home = new Intent(LoginActivity.this, MainActivity.class);
                    startActivity(home);
                    finish();
                } else {
                    // User is signed out
                    Log.d("@@@@", "onAuthStateChanged:signed_out");
                }
            }
        };

        displayLoadingState();
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        Icepick.saveInstanceState(this, outState);
    }

    @Override
    public void onStop() {
        super.onStop();
        if (mAuthListener != null) {
            mAuth.removeAuthStateListener(mAuthListener);
        }
    }

    @Override
    public void onStart() {
        super.onStart();
        if (mAuthListener != null) {
            mAuth.addAuthStateListener(mAuthListener);
        }
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
        if (requestCode == RC_SIGN_IN) {
            hideProgress();
            GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
            handleGoogleSignInResult(result);
        }
    }

    private void hideProgress() {
        isLoading = false;
        displayLoadingState();
    }

    private void displayLoadingState() {
        progress.setVisibility(isLoading ? VISIBLE : GONE);
        googleButton.setVisibility(!isLoading ? VISIBLE : GONE);
    }

    private void showProgress() {
        isLoading = true;
        displayLoadingState();
    }

    private void handleGoogleSignInResult(GoogleSignInResult result) {
        if (result.isSuccess()) {
            // Google Sign In was successful, authenticate with Firebase
            GoogleSignInAccount account = result.getSignInAccount();
            firebaseAuthWithGoogle(account);
        } else {
            Toast.makeText(this, R.string.error_google_sign_in, Toast.LENGTH_SHORT).show();
        }
    }

    private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
        Log.d("@@@@", "firebaseAuthWithGoogle:" + acct.getId());

        AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        Log.d("@@@@", "firebaseAuthWithGoogleComplete:" + task.isSuccessful());

                        Needle.onBackgroundThread().execute(new Runnable() {
                            @Override
                            public void run() {
                                try {
                                    FirebaseInstanceId.getInstance().deleteInstanceId();
                                } catch (IOException e) {
                                    Log.d("@@@@", "deleteInstanceIdCatch: " + e.getMessage());
                                }
                            }
                        });

                        if (!task.isSuccessful()) {
                            Log.w("@@@@", "firebaseAuthWithGoogleFailed", task.getException());
                            Toast.makeText(LoginActivity.this, R.string.error_google_sign_in, Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }

    @OnClick(R.id.activity_login_google_button)
    public void attemptGoogleSignIn() {
        Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
        startActivityForResult(signInIntent, RC_SIGN_IN);
        showProgress();
    }
}

这是登录活动代码
在其中我得到一个错误
找不到符号类FirebaseInstanceIdService
我已附上图片以供参考



这是我最后一年的项目，是一个基于聊天的应用程序
由于这个过程，我无法生成APK，但Gradle同步成功。

最佳答案

开发人员陷入了不推荐使用的FirebaseInstanceIdService的问题，那么现在该怎么办？

FirebaseInstanceIdService

此类已弃用。
支持在onNewToken中覆盖FirebaseMessagingService。一旦实现，就可以安全地删除此服务。
这意味着无需使用FirebaseInstanceIdService服务来获取FCM令牌。您可以安全地删除FirebaseInstanceIdService服务

现在我们需要@Override onNewToken()在“ FirebaseMessagingService”中获取令牌。

样例代码：

    public class MyFirebaseMessagingService extends FirebaseMessagingService {

        @Override
        public void onNewToken(String s) {
            super.onNewToken(s);
            Log.e("NEW_TOKEN",s);
        }

        @Override
        public void onMessageReceived(RemoteMessage remoteMessage) {
            super.onMessageReceived(remoteMessage);
        }
    }

在AndroidManifest.xml中

    <service
            android:name=".MyFirebaseMessagingService"
            android:stopWithTask="false">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT" />
            </intent-filter>
    </service>

在您的活动中获取令牌：如果您需要在活动中获取令牌，则不建议使用.getToken();，其用法如下：

    FirebaseInstanceId.getInstance().getInstanceId().addOnSuccessListener( MyActivity.this,  new OnSuccessListener<InstanceIdResult>() {
         @Override
         public void onSuccess(InstanceIdResult instanceIdResult) {
               String newToken = instanceIdResult.getToken();
               Log.e("newToken",newToken);

         }
     });

希望您能在这里找到解决方案。