Android Firebase 数据库错误:权限被拒绝

问题描述

我正在开发一个需要用户电子邮件和密码身份验证的 android 项目.详细信息存储在 firebase 数据库中.每当我尝试使用电子邮件和密码再次登录时就会出现问题.在我的 logcat 中，错误消息是:

I am working on an android project that requires user email and pwd authentication. The details are stored in the firebase database.The problem occurs whenever I try logging in again with the email and password. In my logcat the error message is:

W/SyncTree: Listen at / failed: DatabaseError: Permission denied

看看我下面的代码:

public class LoginUser extends AppCompatActivity {

private RelativeLayout relativeLayout;

private EditText et_email, et_password;
private Button loginBtn;

private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener authStateListener;
private DatabaseReference databaseReference;

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

    mAuth = FirebaseAuth.getInstance();
    databaseReference = FirebaseDatabase.getInstance().getReference();
    databaseReference.keepSynced(true);

    relativeLayout = (RelativeLayout) findViewById(R.id.activity_login_user);

    et_email = (EditText) findViewById(R.id.emailField);
    et_password = (EditText) findViewById(R.id.pwdField);
    loginBtn = (Button) findViewById(R.id.loginBtn);

    loginBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            initLogin();
        }
    });

    authStateListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            if (firebaseAuth.getCurrentUser() != null){
                initLogin();
            }
            else {
                startActivity(new Intent(LoginUser.this,RegisterFireBase.class));
            }
        }
    };

}

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

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

private void initLogin() {

    String email = et_email.getText().toString().trim();
    String pass = et_password.getText().toString().trim();

    if (!TextUtils.isEmpty(email) && !TextUtils.isEmpty(pass)){
        mAuth.signInWithEmailAndPassword(email,pass).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {

                checkForUser();

            }
        });
    }
    else {
        Toast.makeText(this, "Some fields are empty", Toast.LENGTH_SHORT).show();
    }

}

private void checkForUser() {

    final String userId = mAuth.getCurrentUser().getUid();
    databaseReference.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            if (dataSnapshot.hasChild(userId)){

                Intent loginIntent =  new Intent(LoginUser.this, FireProfile.class);
                loginIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(loginIntent);

                Snackbar.make(relativeLayout,"Log In Successful",Snackbar.LENGTH_LONG).show();

            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
}

}

这可能是什么原因造成的?

What could be causing this?

推荐答案

可能的原因是:您没有对数据库的读写访问权限.用于启用读写访问:

Possible reason could be : you dont have read and write access on your database.For enabling read and write access :

转到 firebase 控制台并启用对数据库的读写操作.

Go to firebase console and enable read and write operations on your database.

Firebase 控制台 -> 数据库(开发)-> 规则

Firebase Console -> Database(develop) -> RULES

{
  "rules": {
    ".read": "true",
    ".write": "true"
  }
}

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