android - 默认 FirebaseApp 未在此进程 com.example.journal 中初始化。确保首先调用 FirebaseApp.initializeApp(Context)

Question

我正在开发一个包含鸟类学应用程序的应用程序，并且我使用 Firabase 作为 BBDD。
我的问题是我收到以下错误:'java.lang.IllegalStateException:默认 FirebaseApp 未在此进程 com.example.journal 中初始化。确保首先调用 FirebaseApp.initializeApp(Context)。
我有一个第一个屏幕，它有一个 ImageView，它与一个 OnClickListenner() 相关联，负责将您发送到登录屏幕。当应用程序尝试顶部发送您崩溃。
我也在应用程序中使用导航组件，但与崩溃无关。
FirtsScreen.class

public class FirtsScreen extends AppCompatActivity {

    private ImageView img;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_firts_screen);

        img = (ImageView) findViewById(R.id.imgInicio);

        img.setImageResource(R.drawable.inicio);

        img.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getApplicationContext(), "WELCOME TO BIRD-LAND !", Toast.LENGTH_LONG).show();
                Intent miIntent = new Intent(getApplicationContext(), Login.class);
                startActivity(miIntent);

            }
        });


    }
}

MainActivity.class

public class MainActivity extends AppCompatActivity implements FilterDialog.FilterDialogListener {




    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        BottomNavigationView navView = findViewById(R.id.nav_view);

        AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(
                R.id.navigation_home, R.id.navigation_search, R.id.navigation_journal, R.id.navigation_account, R.id.navigation_capture)
                .build();
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
        NavigationUI.setupWithNavController(navView, navController);

        //Inicializo Firebase.
        FirebaseApp.initializeApp(getApplicationContext());
    }



    @Override
    public void getFilters(ArrayList<String> regions) {
        SearchFragment fragment = (SearchFragment) getSupportFragmentManager().findFragmentById(R.id.navigation_search);
        fragment.receiveRegions(regions);
        int i = 0;
        i++;
    }
}

登录类

public class Login extends AppCompatActivity {

    private EditText EtUser;
    private EditText EtPass;
    private ImageButton btnLogin;
    private String user;
    private String pass;
    private Usuario usuario;
    private FirebaseAuth mAuth;
    private FirebaseUser current_user;
    private ImageButton btnGoogle;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        FirebaseApp.initializeApp(getApplicationContext());
//Todo:Explota aqui porque pide que inicializes FirebaseApp con la linea de arriba, pero aun asi no va.
//Here is the where crash the App.
        mAuth = FirebaseAuth.getInstance();

        EtUser = (EditText) findViewById(R.id.EtLoginUser);
        EtPass = (EditText) findViewById(R.id.EtLoginPass);

        btnLogin = (ImageButton) findViewById(R.id.btnLogin);

        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                user = EtUser.getText().toString();
                pass = EtPass.getText().toString();

                usuario = new Usuario(user, pass);

                if(!user.isEmpty() && !pass.isEmpty()){

                    usuario = new Usuario(user, pass);


                    current_user = FirebaseAuth.getInstance().getCurrentUser();
                    if (current_user != null) {
                        // Name, email address, and profile photo Url
                        String name = current_user.getDisplayName();
                        String email = current_user.getEmail();
                        Uri photoUrl = current_user.getPhotoUrl();

                        // Check if user's email is verified
                        boolean emailVerified = current_user.isEmailVerified();

                        // The user's ID, unique to the Firebase project. Do NOT use this value to
                        // authenticate with your backend server, if you have one. Use
                        // FirebaseUser.getIdToken() instead.
                        String uid = current_user.getUid();
                    }



                }else{
                    Toast.makeText(getApplicationContext(), "Es necesario completar los datos requeridos.", Toast.LENGTH_LONG).show();
                }
            }
        });

        btnGoogle = (ImageButton) findViewById(R.id.btnGoogle);
        btnGoogle.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                current_user = FirebaseAuth.getInstance().getCurrentUser();
                firebaseAuthWithGoogle(current_user.getUid());


            }
        });

    }

    private void firebaseAuthWithGoogle(String uid) {
        AuthCredential credential = GoogleAuthProvider.getCredential(uid, null);
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            // Sign in success, update UI with the signed-in user's information
                            Log.d(TAG, "signInWithCredential:success");
                            FirebaseUser user = mAuth.getCurrentUser();
                            // Redireccionar a HomeFragment
                            Navigation.findNavController(btnGoogle).navigate(R.id.fragmentHome);
                        } else {
                            // If sign in fails, display a message to the user.
                            Log.w(TAG, "signInWithCredential:failure", task.getException());
                            Toast.makeText(Login.this, "Authentication Failed.", Toast.LENGTH_SHORT).show();

                        }

                    }
                });
    }
    @Override
    protected void onStart() {
        super.onStart();

        FirebaseUser currentUser = mAuth.getCurrentUser();


    }

    private void loginUser(Usuario usuario) {
        //TODO:Añadir Firebase Auth.


        mAuth.signInWithEmailAndPassword(usuario.getUser(), usuario.getPass()).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {

                if(task.isSuccessful()){

                    startActivity(new Intent(getApplicationContext(), MainActivity.class));
                    finish();

                }else{

                    Toast.makeText(getApplicationContext(), "No se pudo iniciar sesión. Compruebe sus datos", Toast.LENGTH_SHORT).show();

                }
            }
        });


        //Envio de datos al mainActivity para informar del usuario registrado.
        Bundle datos = new Bundle();
        datos.putSerializable("User", usuario);
        Intent miIntent = new Intent(getApplicationContext(), MainActivity.class);
        startActivity(miIntent);

        Toast.makeText(getApplicationContext(), "Usuario registrado correctamente", Toast.LENGTH_LONG).show();

    }
}

如果您知道错误的来源，请提前感谢!
[编辑]
从错误 logcat 添加堆栈跟踪:

Caused by: java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.example.journal. Make sure to call FirebaseApp.initializeApp(Context) first.
        at com.google.firebase.FirebaseApp.getInstance(FirebaseApp.java:183)
        at com.google.firebase.auth.FirebaseAuth.getInstance(com.google.firebase:firebase-auth@@20.0.2:1)
        at com.example.journal.Login.onCreate(Login.java:49)
        at android.app.Activity.performCreate(Activity.java:7802)
        at android.app.Activity.performCreate(Activity.java:7791)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016) 
        at android.os.Handler.dispatchMessage(Handler.java:107) 
        at android.os.Looper.loop(Looper.java:214) 
        at android.app.ActivityThread.main(ActivityThread.java:7356) 

Answer 1

你可能错过了这一行检查你的 build.gadle

apply plugin: 'com.google.gms.google-services'

那为我修好了。