Question

我想知道即使用户未经过身份验证，我是否可以从Firebase数据库获取数据。我没有理由这样做。其中之一是用户首次注册并将其数据保存在FirebaseDatabase上。一旦他退出并想再次登录，我想跳过MainActivity的注册活动。

以下是代码示例

  public class FireBaseLoginActivity extends AppCompatActivity {
    private FirebaseUser currentUser;
    private DatabaseReference refToUsers;
    private static final int RC_SIGN_IN = 1;


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


      currentUser = FirebaseAuth.getInstance().getCurrentUser();
      refToUsers = 
   FirebaseDatabase.getInstance().getReference().child(Params.USERS);

          startSignIn();
     }
  }


      public void startSignIn(){
    List<AuthUI.IdpConfig> providers = Arrays.asList(
            new AuthUI.IdpConfig.Builder(AuthUI.GOOGLE_PROVIDER)
                    .setPermissions(Arrays.asList(Scopes.PROFILE,Scopes.EMAIL)).build(),
            new AuthUI.IdpConfig.Builder(AuthUI.EMAIL_PROVIDER).build());
    //new AuthUI.IdpConfig.Builder(AuthUI.FACEBOOK_PROVIDER).build());
    Intent intent = AuthUI.getInstance()
            .createSignInIntentBuilder()
            .setAvailableProviders(providers).build();
    startActivityForResult(intent,RC_SIGN_IN);
}


protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if(requestCode == RC_SIGN_IN){
        IdpResponse idpResponse = IdpResponse.fromResultIntent(data);
        if(idpResponse != null && resultCode == RESULT_OK){
          //  Log.d("currentuser",currentUser.getUid().toString());
            //check if the user is exists by userUID. if he is it jumps to main activity
            refToUsers.addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    if(dataSnapshot.hasChild(currentUser.getUid())){

                        Intent mainActivity = new Intent(getApplicationContext(), MainActivity.class);
                        mainActivity.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        startActivity(mainActivity);
                    }else{
                        //if the user is not exists it will move to register activity
                        Intent registerActivity = new Intent(getApplicationContext(), RegisterActivity.class);
                        registerActivity.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        startActivity(registerActivity);
                    }
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });



        }else if (idpResponse.getErrorCode() == ErrorCodes.NO_NETWORK) {
            errorToast("No internet connection");

        }else if (idpResponse.getErrorCode() == ErrorCodes.UNKNOWN_ERROR) {
            errorToast("Unknown Error");
        }
    }
}

在这里，我使用FirebaseUI登录。 refToUsers是对用户列表的引用，我检查userUID是否存在。如果是，它将跳过注册活动。如果没有，它会跳转到RegisterActivity。由于某种原因没有任何反应它只是跳过整个refToUser事件监听器。我不知道是什么原因。

也许你们有更好的解决方案给我？

我还要在FirebaseDatabase中显示存储在那里的RecyclerView中的数据。如果用户已登录，则应该生效

Android Firebase - 在用户未经过身份验证时获取数据

0 个答案: