Android Tutorial => Sign In Firebase user with email and password

Example

public class LoginActivity extends BaseAppCompatActivity {

    @BindView(R.id.tIETLoginEmail)
    EditText mEditEmail;
    @BindView(R.id.tIETLoginPassword)
    EditText mEditPassword;

    @Override
    protected void onResume() {
        super.onResume();
        FirebaseUser firebaseUser = mFirebaseAuth.getCurrentUser();
        if (firebaseUser != null)
            startActivity(new Intent(this, HomeActivity.class));
    }

    @Override
    protected int getLayoutResourceId() {
        return R.layout.activity_login;
    }

    @OnClick(R.id.btnLoginLogin)
    void onSignInClick() {

        FormValidationUtils.clearErrors(mEditEmail, mEditPassword);

        if (FormValidationUtils.isBlank(mEditEmail)) {
            FormValidationUtils.setError(null, mEditEmail, "Please enter email");
            return;
        }

        if (!FormValidationUtils.isEmailValid(mEditEmail)) {
            FormValidationUtils.setError(null, mEditEmail, "Please enter valid email");
            return;
        }

        if (TextUtils.isEmpty(mEditPassword.getText())) {
            FormValidationUtils.setError(null, mEditPassword, "Please enter password");
            return;
        }

        signInWithEmailAndPassword(mEditEmail.getText().toString(), mEditPassword.getText().toString());
    }

    private void signInWithEmailAndPassword(String email, String password) {
        DialogUtils.showProgressDialog(this, "", getString(R.string.sign_in), false);
        mFirebaseAuth
                .signInWithEmailAndPassword(email, password)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {

                        DialogUtils.dismissProgressDialog();

                        if (task.isSuccessful()) {
                            Toast.makeText(LoginActivity.this, "Login Successful", Toast.LENGTH_SHORT).show();
                            startActivity(new Intent(LoginActivity.this, HomeActivity.class));
                            finish();
                        } else {
                            Toast.makeText(LoginActivity.this, task.getException().getMessage(),
                                    Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }

    @OnClick(R.id.btnLoginSignUp)
    void onSignUpClick() {
        startActivity(new Intent(this, SignUpActivity.class));
    }


    @OnClick(R.id.btnLoginForgotPassword)
    void forgotPassword() {
        startActivity(new Intent(this, ForgotPasswordActivity.class));
    }
}

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Android

Android Firebase Sign In Firebase user with email and password

Fastest Entity Framework Extensions

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