从活动到片段的signInWithEmailAndPassword

Question

我是Android开发的新手，我在将firebase auth从SignInActivity传递到HomeFragment上有一个问题。代码是这样的

公共类SignInActivity扩展AppCompatActivity

private EditText inputEmail, inputPassword;
private FirebaseAuth auth;
private ProgressBar progressBar;
private Button btnSignIn, btnResetPassword;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //Get Firebase Auth Instance
    auth = FirebaseAuth.getInstance();

    setContentView(R.layout.activity_sign_in);

    inputEmail = (EditText) findViewById(R.id.email);
    inputPassword = (EditText) findViewById(R.id.password);
    progressBar = (ProgressBar) findViewById(R.id.progressBar);
    btnSignIn = (Button) findViewById(R.id.action_sign_in_button);
    btnResetPassword = (Button) findViewById(R.id.intent_reset_password_button);

    btnSignIn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String email = inputEmail.getText().toString();
            final String password = inputPassword.getText().toString();

            if (TextUtils.isEmpty(email)) {
                Toast.makeText(getApplicationContext(), "Enter Email Address", Toast.LENGTH_SHORT).show();
                return;
            }
            if (TextUtils.isEmpty(password)) {
                Toast.makeText(getApplicationContext(), "Enter Password", Toast.LENGTH_SHORT).show();
                return;
            }

            progressBar.setVisibility(View.VISIBLE);

            //Authenticate User
            auth.signInWithEmailAndPassword(email, password)
                    .addOnCompleteListener(SignInActivity.this, new OnCompleteListener<AuthResult>() {
                        @Override
                        public void onComplete(@NonNull Task<AuthResult> task) {
                            // If sign in fails, display a message to the user. If sign in succeeds
                            // the auth state listener will be notified and logic to handle the
                            // signed in user can be handled in the listener.
                            progressBar.setVisibility(View.GONE);
                            if (!task.isSuccessful()) {
                                //There was an Error
                                if (password.length() < 6) {
                                    inputPassword.setError(getString(R.string.minimum_password));
                                } else {
                                    Toast.makeText(SignInActivity.this, getString(R.string.auth_failed), Toast.LENGTH_SHORT).show();
                                }
                            } else {
                                HomeFragment fragment = new HomeFragment();
                                FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
                                transaction.replace(R.id.home_fragment, fragment);
                                transaction.commit();
                            }
                        }
                    });
        }
    });
}

}

这是HomeFragment片段

公共类HomeFragment扩展Fragment{

public HomeFragment() {
    // Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_home, container, false);
}

}

这是logcat

致命异常：主进程:clouwiko.dev.prasiku，PID:30462 java.lang.runtimeException:clouwiko.dev.prasiku.activity.signinActivity@3039242e必须在clouwiko.dev.prasiku.fragment.homefragment.onattach（homefragment.java：84）在Android.support.v4.app.fragmentManagerimpl.moveTostate（fragmentManager.java：1363）在entTransition.java:1070)在Android.support.v4.app.fragmentTransition.startTransitions(FragmentTransition.java:115)在Android.support.v4.app.fragmentManagerImpl.ExecuteOptoGether(FragmentManager.java:2374)在Android.support.v4.app.fragmentManagerImpl.RemoveredUntAntOperationSandExecute(FragmentManager.java:2332)在00）在Android.os.handler.handleCallback（handler.java:739)在Android.os.handler.dispatchMessage（handler.java:95)在Android.os.handler.dispatchMessage（handler.java:145)在Android.app.activitythread.loop（looper.java:145)在Android.app.activitythread.main（activitythread.java:5942)在java.lang.reflect.Method.invoke（原生方法）在init.main(zygoteinit.java:1195)

我点击登录后应用程序总是崩溃，你能帮帮我吗？谢谢。

Answer 1

你的问题很清楚：

clouwiko.dev.prasiku.activity.SigninActivity@3039242e必须实现OnFragmentInteractionListener

您需要实现一种到您的片段和活动进行通信的方法。医生解释了你应该怎么做。此外，这个家伙详细解释了你如何做到这一点。