片段无法转换为 java.util.concurrent.Executor 错误答案

【问题标题】：Fragment cannot be cast to java.util.concurrent.Executor error片段无法转换为 java.util.concurrent.Executor 错误
【发布时间】：2021-08-01 10:08:04
【问题描述】：

我正在尝试使用片段登录或注册，在成功登录/注册后，HomeActivity 应该会加载。问题是，当我单击登录/注册按钮时，它会返回到同一片段，而不是转到 HomeActivity.class。应用程序的初始化页面称为 LoginRegistrationActivity.class，它将在其中调用 SignIn 片段。我确认登录/注册运行良好，但在成功验证后我无法导航到HomeActivity.class。我不确定 AndroidManifest.xml 文件是否存在问题。

单击登录后出现此 logcat 错误：

java.lang.ClassCastException：com.fyp.selfzen.fragments.O_LoginRegistration.SignIn 无法转换为 java.util.concurrent.Executor 在 com.fyp.selfzen.fragments.O_LoginRegistration.SignIn.login(SignIn.java:124) 在 com.fyp.selfzen.fragments.O_LoginRegistration.SignIn$1.onClick(SignIn.java:87) 在 android.view.View.performClick(View.java:7448) 在 android.view.View.performClickInternal(View.java:7425) 在 android.view.View.access$3600(View.java:810) 在 android.view.View$PerformClick.run(View.java:28305) 在 android.os.Handler.handleCallback(Handler.java:938) 在 android.os.Handler.dispatchMessage(Handler.java:99) 在 android.os.Looper.loop(Looper.java:223) 在 android.app.ActivityThread.main(ActivityThread.java:7656) 在 java.lang.reflect.Method.invoke（本机方法）在 com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

SignIn.java 片段

public class SignIn extends Fragment{
    private EditText editText_email, editText_password;
    private String email, password;
    private FirebaseAuth firebaseAuth;
    private ProgressDialog progressDialog;

LoginRegisrationActivity loginRegistration;

public SignIn(LoginRegisrationActivity loginRegistration) {
    this.loginRegistration = loginRegistration;
}

public static SignIn newInstance(LoginRegisrationActivity loginRegistration) {
    SignIn fragment = new SignIn(loginRegistration);
    return fragment;
}

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

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

    progressDialog = new ProgressDialog(getContext());
    firebaseAuth = FirebaseAuth.getInstance();
    editText_email = view.findViewById(R.id.editText_email_login_activity);
    editText_password = view.findViewById(R.id.editText_password_login_activity);
    TextView button_login = view.findViewById(R.id.button_login_activity);
    TextView textView_signup_login = view.findViewById(R.id.textView_signup_login);
    final SmoothCheckBox checkBox = view.findViewById(R.id.checkbox_login_activity);
    checkBox.setChecked(false);


    button_login.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            email = editText_email.getText().toString();
            password = editText_password.getText().toString();

            editText_email.clearFocus();
            editText_password.clearFocus();

            login(email, password);
        }
    });

    textView_signup_login.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            SignUp f2 = SignUp.newInstance(loginRegistration);
            loginRegistration.loadFrag(f2, getResources().getString(R.string.regis));
        }
    });
    return view;
}

public void login(String email, String password) {

    editText_email.setError(null);
    editText_password.setError(null);

    if (!isValidMail(email) || email.isEmpty()) {
        editText_email.requestFocus();
        editText_email.setError(getResources().getString(R.string.please_enter_email));
    }
    else if(password.isEmpty()){
        editText_password.requestFocus();
        editText_password.setError(getResources().getString(R.string.please_enter_password));
    }
    else {
        progressDialog.setMessage("Please wait...");
        progressDialog.show();
        progressDialog.setCanceledOnTouchOutside(false);

        firebaseAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener((Executor) this, new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                if (task.isSuccessful()) {
                    Toast.makeText(getContext(), "Successfully sign in!", Toast.LENGTH_LONG).show();
                  // Intent i = new Intent(loginRegistration, HomeActivity.class); //First try to go to HomeActivity
                    Intent i = new Intent(getContext(), HomeActivity.class); //Second try 
                    startActivity(i);
                    //loginRegistration.finish();
                } else {
                    Toast.makeText(getContext(), "Sign in failed", Toast.LENGTH_LONG).show();
                }
                progressDialog.dismiss();
            } //onComplete
        }); // firebaseAuth
    }// else
} // login end
}

SignUp.java 片段

public class SignUp extends Fragment{
    private EditText editText_name, editText_email, editText_password, editText_phoneNo;
    private String name, email, password, phoneNo;
    private ProgressDialog progressDialog;
    private FirebaseAuth firebaseAuth;

LoginRegisrationActivity loginRegistration;

public SignUp(LoginRegisrationActivity loginRegistration) {
    this.loginRegistration = loginRegistration;
    // Required empty public constructor
}

public static SignUp newInstance(LoginRegisrationActivity loginRegistration) {
    SignUp fragment = new SignUp(loginRegistration);
    return fragment;
}

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

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

    progressDialog = new ProgressDialog(getContext());
    firebaseAuth = FirebaseAuth.getInstance();
    editText_name = view.findViewById(R.id.editText_name_register);
    editText_email = view.findViewById(R.id.editText_email_register);
    editText_password = view.findViewById(R.id.editText_password_register);
    editText_phoneNo = view.findViewById(R.id.editText_phoneNo_register);
    TextView button_submit = view.findViewById(R.id.button_submit);
    TextView textView_login = view.findViewById(R.id.textView_login_register);


    // Go to login page
    textView_login.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            SignIn f1 = SignIn.newInstance(loginRegistration);
            loginRegistration.loadFrag(f1, getResources().getString(R.string.login));
        }
    });


    button_submit.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            name = editText_name.getText().toString();
            email = editText_email.getText().toString();
            password = editText_password.getText().toString();
            phoneNo = editText_phoneNo.getText().toString();

            form();
        }
    });
    return view;
}


private boolean isValidMail(String email) {
    return android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches();
}

public void form() {

    editText_name.setError(null);
    editText_email.setError(null);
    editText_password.setError(null);
    editText_phoneNo.setError(null);

    if (name.equals("") || name.isEmpty()) {
        editText_name.requestFocus();
        editText_name.setError(getResources().getString(R.string.please_enter_name));
    }
    else if (!isValidMail(email) || email.isEmpty()) {
        editText_email.requestFocus();
        editText_email.setError(getResources().getString(R.string.please_enter_email));
    }
    else if (password.equals("") || password.isEmpty()) {
        editText_password.requestFocus();
        editText_password.setError(getResources().getString(R.string.please_enter_password));
    }
    else if (phoneNo.equals("") || phoneNo.isEmpty()) {
        editText_phoneNo.requestFocus();
        editText_phoneNo.setError(getResources().getString(R.string.please_enter_phone));
    }
    else {
        editText_name.clearFocus();
        editText_email.clearFocus();
        editText_password.clearFocus();
        editText_phoneNo.clearFocus();
    }
    progressDialog.setMessage("Please wait...");
    progressDialog.show();
    progressDialog.setCanceledOnTouchOutside(false);
    firebaseAuth.createUserWithEmailAndPassword(email,password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            if(task.isSuccessful()){
                Toast.makeText(getContext(), "Successfully registered!", Toast.LENGTH_LONG).show();
                //Intent i = new Intent(loginRegistration, HomeActivity.class);
                Intent i = new Intent(getActivity(), HomeActivity.class);
                startActivity(i);
                //loginRegistration.finish();
            }
            else{
                Toast.makeText(getContext(), "Sign up failed", Toast.LENGTH_LONG).show();
            }
            progressDialog.dismiss();
        }
    });
} // end of form
}

LoginRegistrationActivity.class

public class LoginRegisrationActivity extends AppCompatActivity {
    private String curent;
    VideoView vide;

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

        vide = findViewById(R.id.vide);
        String video_url = "android.resource://" + getPackageName() + "/" + R.raw.login_video;
        Uri videoUri = Uri.parse(video_url);
        vide.setVideoURI(videoUri);
        vide.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mp) {
                mp.setLooping(true);
                vide.requestFocus();
                vide.start();
            }
        });

        SignIn f1 = SignIn.newInstance(this);
        loadFrag(f1, getResources().getString(R.string.login));    
    }


    public void loadFrag(Fragment f1, String name) {

        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();

        if(!name.equals(curent)){
            curent =name;
            ft.replace(R.id.frame_layout, f1, name);
        }

        ft.commitAllowingStateLoss();

    }


}

AndroidManifest.xml

    <activity
        android:name="com.fyp.selfzen.activities.LoginRegisrationActivity"
        android:screenOrientation="portrait" />
    <activity
        android:name="com.fyp.selfzen.activities.HomeActivity"
        android:label="@string/title_activity_home"
        android:launchMode="singleTop"
        android:screenOrientation="portrait"
        android:windowSoftInputMode="adjustPan">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>

        <meta-data
            android:name="android.app.searchable"
            android:resource="@xml/searchable" />
    </activity>

【问题讨论】：

标签： android-studio android-intent android-activity fragment

【解决方案1】：

在 SignIn.java 和 SignUp.java 片段中，为 firebaseAuth 添加 addOnCompleteListener()。因此，在其中传递参数，

而不是，

firebaseAuth.createUserWithEmailAndPassword(email,password).addOnCompleteListener((Executor) this, new OnCompleteListener<AuthResult>() {}

致，

firebaseAuth.createUserWithEmailAndPassword(email,password).addOnCompleteListener(getContext(), new OnCompleteListener<AuthResult>() {}

如果，getContext() 不起作用然后尝试编写 getActivity()。

【讨论】：

嗨！我只是将我的代码更新为firebaseAuth.createUserWithEmailAndPassword(email,password).addOnCompleteListener(new OnCompleteListener<AuthResult>()。我刚刚删除了(Executor) this,。但是在成功登录/注册后，我仍然会重定向回登录页面。
当您单击登录按钮时，您将获得准确的吐司。 “注册成功！”还是“注册失败”？如果您看不到 toast，那么只需在您的日志中打印并检查。
"注册成功！"是显示然后登录页面再次显示。
我尝试使用除HomeActivity.class 之外的其他类来加载，但得到的结果仍然相同。它加载回登录页面。
你调试了吗？？你在哪一行出错了？？并且可以发布您的家庭活动吗？