单击工具栏中的 ImageView 时，我的应用程序崩溃了 - Fragments

Question

以下是我的依赖项

implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'com.google.android.material:material:1.3.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'

下面是我的 HomeFragment.java

package com.example.practice.fragments;

import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.fragment.app.Fragment;

import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;
import com.denzcoskun.imageslider.ImageSlider;
import com.denzcoskun.imageslider.models.SlideModel;
import com.example.practice.MainActivity;
import com.example.practice.R;
import com.example.practice.activities.SettingsActivity;
import com.example.practice.activities.login_n_register.LoginActivity;
import com.example.practice.activities.login_n_register.ProfileActivity;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.FirebaseApp;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.firestore.CollectionReference;
import com.google.firebase.firestore.DocumentReference;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.EventListener;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.FirebaseFirestoreException;
import com.shashank.sony.fancytoastlib.FancyToast;
import com.thefinestartist.finestwebview.FinestWebView;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

import de.hdodenhof.circleimageview.CircleImageView;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link HomeFragment#newInstance} factory method to
 * create an instance of this fragment.
 */
public class HomeFragment extends Fragment {
    private FirebaseFirestore firebaseFirestore;
    private FirebaseAuth mAuth;
    private String current_user_id;
    private FirebaseUser user;
    private String userName,name,email;
    private String userid;
    Dialog myDialog;
    String currentUserImage;
    CircleImageView currentUserImageCV;
    private static final String TAG = "MainActivity";
    final String PREFS_NAME = "MyPrefsFile";

    private FirebaseFirestore db = FirebaseFirestore.getInstance();
    private CollectionReference notebookRef = db.collection("Users");

    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

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

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment HomeFragment.
     */
    // TODO: Rename and change types and number of parameters
    public static HomeFragment newInstance(String param1, String param2) {
        HomeFragment fragment = new HomeFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
        setHasOptionsMenu(true);
    }

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

        Toolbar mToolbar = (Toolbar) view.findViewById(R.id.home_toolbar);
        if (mToolbar != null) {
            ((AppCompatActivity)getActivity()).setSupportActionBar(mToolbar);
            ((AppCompatActivity)getActivity()).getSupportActionBar().setTitle("");
        }
        mToolbar.setTitle(null);

        ImageSlider imageSlider = view.findViewById(R.id.image_slider);

        List<SlideModel> slideModels = new ArrayList<>();

        slideModels.add(new SlideModel("SomeImageURL"));
        slideModels.add(new SlideModel("SomeImageURL"));
        slideModels.add(new SlideModel("SomeImageURL"));
        slideModels.add(new SlideModel("SomeImageURL"));
        slideModels.add(new SlideModel("SomeImageURL"));
        slideModels.add(new SlideModel("SomeImageURL"));

        imageSlider.setImageList(slideModels, true);

        currentUserImageCV = view.findViewById(R.id.currentUserImageCV);
        myDialog = new Dialog(getActivity().getApplicationContext());

        FirebaseApp.initializeApp(getActivity().getApplicationContext());
        mAuth = FirebaseAuth.getInstance();
        firebaseFirestore = FirebaseFirestore.getInstance();
        SharedPreferences settings = this.getActivity().getSharedPreferences(PREFS_NAME, 0);
        user = FirebaseAuth.getInstance().getCurrentUser();

        if(user!=null)
        {
            userid = FirebaseAuth.getInstance().getCurrentUser().getUid();
            final DocumentReference docRef = db.collection("Users").document(userid);
            docRef.addSnapshotListener(new EventListener<DocumentSnapshot>() {
                @Override
                public void onEvent(@Nullable DocumentSnapshot snapshot,
                                    @Nullable FirebaseFirestoreException e) {
                    if (snapshot.exists()){
                        userName = snapshot.getString("username");
                        name = snapshot.getString("name");
                        email = snapshot.getString("email");
                        currentUserImage = snapshot.getString("image");

                        Glide.with(getActivity().getApplicationContext())
                                .load(currentUserImage)
                                .diskCacheStrategy(DiskCacheStrategy.RESOURCE)
                                .centerCrop()
                                .placeholder(R.drawable.default_profile)
                                .into(currentUserImageCV);
                    } else {
                        FancyToast.makeText(getActivity().getApplicationContext(), getString(R.string.things_gone_bad), FancyToast.LENGTH_LONG, FancyToast.ERROR,false).show();
                    }
                }
            });

            userid = FirebaseAuth.getInstance().getCurrentUser().getUid();
            firebaseFirestore.collection("Users").document(userid).get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
                @Override
                public void onComplete(@NonNull Task<DocumentSnapshot> task) {
                    if(task.isSuccessful()){
                        if(task.getResult().exists()){
                            userName = task.getResult().getString("username");
                            name = task.getResult().getString("name");
                            email= task.getResult().getString("email");
                            currentUserImage = task.getResult().getString("image");

                            Glide.with(getActivity().getApplicationContext())
                                    .load(currentUserImage)
                                    .diskCacheStrategy(DiskCacheStrategy.RESOURCE)
                                    .centerCrop()
                                    .placeholder(R.drawable.default_profile)
                                    .into(currentUserImageCV);

                        }
                    } else {
                        String error = task.getException().getMessage();
                        FancyToast.makeText(getActivity().getApplicationContext(),"500 Server Retrieve Error: " + error, FancyToast.LENGTH_LONG, FancyToast.ERROR,false).show();
                    }
                }
            });
        }

        currentUserImageCV.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ShowPopup(v);
            }
        });

        return view;
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.main_menu, menu);
        super.onCreateOptionsMenu(menu,inflater);
    }
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {

            case R.id.action_settings:
                startActivity(new Intent(getActivity().getApplicationContext(), SettingsActivity.class));
                return true;
        }
        return false;
    }

    public void ShowPopup(View v) {
        TextView userName;
        CircleImageView manageAcc_userImage;
        Button manageAccountBtn,signoutBtn,privacyBtn,termsBtn;
        myDialog.setContentView(R.layout.manage_acc_popup);
        manageAcc_userImage = myDialog.findViewById(R.id.manageAcc_userImage);
        userName =(TextView) myDialog.findViewById(R.id.manageAcc_userEmail);
        userName.setText(email);
        manageAccountBtn = (Button) myDialog.findViewById(R.id.button);
        signoutBtn = (Button) myDialog.findViewById(R.id.signoutBtn);
        privacyBtn = (Button) myDialog.findViewById(R.id.privacyBtn);
        termsBtn = (Button) myDialog.findViewById(R.id.termsBtn);

        signoutBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myDialog.dismiss();
                logout();
            }
        });

        privacyBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myDialog.dismiss();

                new FinestWebView.Builder(getActivity().getApplicationContext()).theme(R.style.FinestWebViewTheme)
                        .titleDefault(getString(R.string.privacy_policy))
                        .toolbarScrollFlags(0)
                        .statusBarColorRes(R.color.colorPrimary)
                        .toolbarColorRes(R.color.colorPrimary)
                        .titleColorRes(R.color.colorWhiteText)
                        .urlColorRes(R.color.colorWhiteText)
                        .iconDefaultColorRes(R.color.colorWhiteText)
                        .theme(R.style.webview)
                        .progressBarColorRes(R.color.colorPrimaryDark)
                        .swipeRefreshColorRes(R.color.colorPrimaryLight)
                        .menuSelector(R.drawable.selector_dark_theme)
                        .menuTextGravity(Gravity.CENTER_VERTICAL | Gravity.RIGHT)
                        .menuTextPaddingRightRes(R.dimen.defaultMenuTextPaddingLeft)
                        .dividerHeight(0)
                        .gradientDivider(false)
                        .setCustomAnimations(R.anim.slide_left_in, R.anim.hold, R.anim.hold,
                                R.anim.slide_right_out)
                        .disableIconBack(true)
                        .disableIconClose(false)
                        .disableIconForward(true)
                        .disableIconMenu(false)
                        .show("https://www.habbo.com/playing-habbo/safety");

            }
        });

        termsBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myDialog.dismiss();

                new FinestWebView.Builder(getActivity().getApplicationContext()).theme(R.style.FinestWebViewTheme)
                        .titleDefault(getString(R.string.terms_of_service))
                        .toolbarScrollFlags(0)
                        .statusBarColorRes(R.color.colorPrimary)
                        .toolbarColorRes(R.color.colorPrimary)
                        .titleColorRes(R.color.colorWhiteText)
                        .urlColorRes(R.color.colorWhiteText)
                        .iconDefaultColorRes(R.color.colorWhiteText)
                        .theme(R.style.webview)
                        .progressBarColorRes(R.color.colorPrimaryDark)
                        .swipeRefreshColorRes(R.color.colorPrimaryLight)
                        .menuSelector(R.drawable.selector_dark_theme)
                        .menuTextGravity(Gravity.CENTER_VERTICAL | Gravity.RIGHT)
                        .menuTextPaddingRightRes(R.dimen.defaultMenuTextPaddingLeft)
                        .dividerHeight(0)
                        .gradientDivider(false)
                        .setCustomAnimations(R.anim.slide_left_in, R.anim.hold, R.anim.hold,
                                R.anim.slide_right_out)
                        .disableIconBack(true)
                        .disableIconClose(false)
                        .disableIconForward(true)
                        .disableIconMenu(false)
                        .show("https://nft.habbo.com/terms");

            }
        });

        Glide.with(getActivity().getApplicationContext())
                .load(currentUserImage)
                .diskCacheStrategy(DiskCacheStrategy.RESOURCE)
                .centerCrop()
                .placeholder(new ColorDrawable(Color.GRAY))
                .into(manageAcc_userImage);

        manageAccountBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent profileIntent = new Intent(getActivity().getApplicationContext(), ProfileActivity.class);
                startActivity(profileIntent);
                getActivity().overridePendingTransition(R.anim.slide_from_right, R.anim.slide_to_left);
            }
        });
        myDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        myDialog.setCancelable(true);
        myDialog.show();
    }

    private void logout() {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity().getApplicationContext(),R.style.MyCustomAlert);
        builder.setTitle(getString(R.string.logoutBtn));
        builder.setMessage(getString(R.string.are_you_sure_logout));
        builder.setPositiveButton(getString(R.string.yes), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                mAuth.signOut();
                sendToLoginPage();
            }
        });

        builder.setNegativeButton(getString(R.string.no), new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        AlertDialog alertDialog = builder.create();
        alertDialog.show();

    }

    private void sendToLoginPage() {
        Intent intent = new Intent(getActivity().getApplicationContext(), LoginActivity.class);
        startActivity(intent);
        getActivity().finish();
        getActivity().overridePendingTransition(R.anim.slide_from_left, R.anim.slide_to_right);
    }

}

上面的代码对我来说很好。 将其从 MainActivity.java 中移出并在片段内部进行了一些更改，但现在我不明白为什么会发生以下情况

当我单击也作为按钮工作的 ImageView 时，我的应用程序崩溃了。

我收到以下错误：

2022-03-10 00:50:47.012 16503-16503/com.example.practice E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.practice, PID: 16503
    android.view.InflateException: Binary XML file line #2 in com.example.practice:layout/manage_acc_popup: Binary XML file line #2 in com.example.practice:layout/manage_acc_popup: Error inflating class com.google.android.material.card.MaterialCardView
    Caused by: android.view.InflateException: Binary XML file line #2 in com.example.practice:layout/manage_acc_popup: Error inflating class com.google.android.material.card.MaterialCardView
    Caused by: java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Constructor.newInstance0(Native Method)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
        at android.view.LayoutInflater.createView(LayoutInflater.java:852)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1004)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:959)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:657)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:532)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:479)
        at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:455)
        at android.app.Dialog.setContentView(Dialog.java:569)
        at com.example.practice.fragments.HomeFragment.ShowPopup(HomeFragment.java:237)
        at com.example.practice.fragments.HomeFragment$3.onClick(HomeFragment.java:210)
        at android.view.View.performClick(View.java:7448)
        at android.view.View.performClickInternal(View.java:7425)
        at android.view.View.access$3600(View.java:810)
        at android.view.View$PerformClick.run(View.java:28305)
        at android.os.Handler.handleCallback(Handler.java:938)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
     Caused by: java.lang.IllegalArgumentException: The style on this component requires your app theme to be Theme.MaterialComponents (or a descendant).
        at com.google.android.material.internal.ThemeEnforcement.checkTheme(ThemeEnforcement.java:243)
        at com.google.android.material.internal.ThemeEnforcement.checkMaterialTheme(ThemeEnforcement.java:217)
        at com.google.android.material.internal.ThemeEnforcement.checkCompatibleTheme(ThemeEnforcement.java:145)
        at com.google.android.material.internal.ThemeEnforcement.obtainStyledAttributes(ThemeEnforcement.java:76)
        at com.google.android.material.card.MaterialCardView.<init>(MaterialCardView.java:124)
        at com.google.android.material.card.MaterialCardView.<init>(MaterialCardView.java:114)
        at java.lang.reflect.Constructor.newInstance0(Native Method) 
        at java.lang.reflect.Constructor.newInstance(Constructor.java:343) 
        at android.view.LayoutInflater.createView(LayoutInflater.java:852) 
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1004) 
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:959) 
        at android.view.LayoutInflater.inflate(LayoutInflater.java:657) 
        at android.view.LayoutInflater.inflate(LayoutInflater.java:532) 
        at android.view.LayoutInflater.inflate(LayoutInflater.java:479) 
        at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:455) 
        at android.app.Dialog.setContentView(Dialog.java:569) 
        at com.example.practice.fragments.HomeFragment.ShowPopup(HomeFragment.java:237) 
        at com.example.practice.fragments.HomeFragment$3.onClick(HomeFragment.java:210) 
        at android.view.View.performClick(View.java:7448) 
        at android.view.View.performClickInternal(View.java:7425) 
        at android.view.View.access$3600(View.java:810) 
        at android.view.View$PerformClick.run(View.java:28305) 
        at android.os.Handler.handleCallback(Handler.java:938) 
        at android.os.Handler.dispatchMessage(Handler.java:99) 
        at android.os.Looper.loop(Looper.java:223) 
        at android.app.ActivityThread.main(ActivityThread.java:7656) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947) 
2022-03-10 00:50:47.013 16503-16503/com.example.practice E/CustomActivityOnCrash: App has crashed, executing CustomActivityOnCrash's UncaughtExceptionHandler
    android.view.InflateException: Binary XML file line #2 in com.example.practice:layout/manage_acc_popup: Binary XML file line #2 in com.example.practice:layout/manage_acc_popup: Error inflating class com.google.android.material.card.MaterialCardView
    Caused by: android.view.InflateException: Binary XML file line #2 in com.example.practice:layout/manage_acc_popup: Error inflating class com.google.android.material.card.MaterialCardView
    Caused by: java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Constructor.newInstance0(Native Method)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
        at android.view.LayoutInflater.createView(LayoutInflater.java:852)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1004)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:959)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:657)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:532)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:479)
        at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:455)
        at android.app.Dialog.setContentView(Dialog.java:569)
        at com.example.practice.fragments.HomeFragment.ShowPopup(HomeFragment.java:237)
        at com.example.practice.fragments.HomeFragment$3.onClick(HomeFragment.java:210)
        at android.view.View.performClick(View.java:7448)
        at android.view.View.performClickInternal(View.java:7425)
        at android.view.View.access$3600(View.java:810)
        at android.view.View$PerformClick.run(View.java:28305)
        at android.os.Handler.handleCallback(Handler.java:938)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
     Caused by: java.lang.IllegalArgumentException: The style on this component requires your app theme to be Theme.MaterialComponents (or a descendant).
        at com.google.android.material.internal.ThemeEnforcement.checkTheme(ThemeEnforcement.java:243)
        at com.google.android.material.internal.ThemeEnforcement.checkMaterialTheme(ThemeEnforcement.java:217)
        at com.google.android.material.internal.ThemeEnforcement.checkCompatibleTheme(ThemeEnforcement.java:145)
        at com.google.android.material.internal.ThemeEnforcement.obtainStyledAttributes(ThemeEnforcement.java:76)
        at com.google.android.material.card.MaterialCardView.<init>(MaterialCardView.java:124)
        at com.google.android.material.card.MaterialCardView.<init>(MaterialCardView.java:114)
        at java.lang.reflect.Constructor.newInstance0(Native Method) 
        at java.lang.reflect.Constructor.newInstance(Constructor.java:343) 
        at android.view.LayoutInflater.createView(LayoutInflater.java:852) 
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1004) 
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:959) 
        at android.view.LayoutInflater.inflate(LayoutInflater.java:657) 
        at android.view.LayoutInflater.inflate(LayoutInflater.java:532) 
        at android.view.LayoutInflater.inflate(LayoutInflater.java:479) 
        at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:455) 
        at android.app.Dialog.setContentView(Dialog.java:569) 
        at com.example.practice.fragments.HomeFragment.ShowPopup(HomeFragment.java:237) 
        at com.example.practice.fragments.HomeFragment$3.onClick(HomeFragment.java:210) 
        at android.view.View.performClick(View.java:7448) 
        at android.view.View.performClickInternal(View.java:7425) 
        at android.view.View.access$3600(View.java:810) 
        at android.view.View$PerformClick.run(View.java:28305) 
        at android.os.Handler.handleCallback(Handler.java:938) 
        at android.os.Handler.dispatchMessage(Handler.java:99) 
        at android.os.Looper.loop(Looper.java:223) 
        at android.app.ActivityThread.main(ActivityThread.java:7656) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947) 

Answer 1

从您的异常堆栈跟踪中，

android.view.InflateException: Binary XML file line #2 in com.example.practice:layout/manage_acc_popup: Binary XML file line #2 in com.example.practice:layout/manage_acc_popup: Error inflating class com.google.android.material.card.MaterialCardView

然后，查看第三行“Caused by...”，即

Caused by: java.lang.IllegalArgumentException: The style on this component requires your app theme to be Theme.MaterialComponents (or a descendant).

因此，使用堆栈跟踪，您应该将Application或Activity主题的样式设置为带有前缀Theme.MaterialComponents.*的任何样式，

这是示例：

1. 在res/value/style.xml中，

    <style name="Theme.MaterialAppTheme" parent="Theme.MaterialComponents.DayNight.DarkActionBar"> <!-- Custom item configurations --> </style>

2. 在AndroidManifest.xml中，

    <application... android:theme="@style/Theme.MaterialAppTheme">

   要么

   <activity... android:theme="@style/Theme.MaterialAppTheme">

Answer 2

尝试这个 -

在 style.xml/theme.xml 中更改您的 Base 应用程序主题父级

将当前父主题替换为

parent="Theme.MaterialComponents.DayNight.NoActionBar"

Answer 3

这是问题所在： myDialog = new Dialog(getActivity().getApplicationContext());

– 不要在那里使用应用程序Context ，因为它没有主题。 你想要的是Activity ； 例如，只是new Dialog(getActivity()) 。 如果此Fragment位于此代码最初工作的MainActivity中，那么如果我正确地遵循您的描述，那么您需要更改的就是这些。 否则，您可能需要查看您的主题设置，如以下答案所示。

这个答案摘自Mike M.对这个问题的评论——谢谢，这是解决问题的唯一真正办法。