android - FirebaseAuth 为空

Question

我的代码中的 FirebaseAuth.getInstance 返回 null，导致我的应用无法运行。这是我的主要内容:

public class MainActivity extends AppCompatActivity {
    //Firebase Auth
    public static final int RC_SIGN_IN = 1;
    //Cloud vision
    private static final String CLOUD_VISION_API_KEY = "AIzaSyBHgLORJOy0BAp6PYL5DqX0hwQYAv8-3xE";
    public static final String FILE_NAME = "temp.jpg";
    private static final String ANDROID_CERT_HEADER = "X-Android-Cert";
    private static final String ANDROID_PACKAGE_HEADER = "X-Android-Package";
    //Cloud vision
    private static final String TAG = MainActivity.class.getSimpleName();
    private static final int GALLERY_PERMISSIONS_REQUEST = 0;
    private static final int GALLERY_IMAGE_REQUEST = 1;
    public static final int CAMERA_PERMISSIONS_REQUEST = 2;
    public static final int CAMERA_IMAGE_REQUEST = 3;
    //Cloud vision
    private TextView mImageDetails;
    private ImageView mMainImage;
    //Firebase instance variables
    //DATABASE
    /*
    private FirebaseDatabase mFirebaseDatabase;
    private DatabaseReference mPhotosDatabaseReference;
    private DatabaseReference mVisionOutputDatabaseReference;
    private DatabaseReference mUserFeedbackDatabaseReference;
    */
    //AUTH
    private FirebaseAuth mFirebaseAuth;
    private FirebaseAuth.AuthStateListener mAuthStateListener;

    //Cloud vision
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //Cloud vision
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        //Initialize Firebase
        //Database
        //mFirebaseDatabase = FirebaseDatabase.getInstance();
        //Auth
        mFirebaseAuth = FirebaseAuth.getInstance();

最后一行是我得到空返回的地方。

干杯。

Answer 1

如果您没有互联网连接，您可能会得到一个空值。如果连接速度较慢，则可能无法立即可用。