Question

在回收器视图中加载列表时遇到问题，该视图位于具有自定义布局的警报对话框中。问题是第一项重复了两次，我不明白为什么。

如果有人可以帮助我和社区理解为什么会发生这种情况并给出一个很好的解释？

问题截图：

AccountActivity 女巫调用对话：

public class AccountActivity extends AppCompatActivity {

    private Context context;
    private Gson gson = new Gson();
    private SharedPreferences sharedPreferences;
    List<UserAvatar> userAvatarList = new ArrayList<>();

    private User user;
    private UserAvatar userAvatar;

    private TextView textViewAccountUsername;
    private TextView textViewAccountFollowersNumber;
    private TextView textViewAccountFollowingNumber;
    private TextView textViewAccountDescription;

    private ImageButton imageButtonAccountBackArrow;
    private ImageView imageViewAccountAvatar;

    private AlertDialog alertDialogChooseAvatar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_account);
        context = getApplicationContext();
        sharedPreferences = context.getSharedPreferences(Constants.sharedPreferencesDocName, Context.MODE_PRIVATE);
        bindUI();
        setListeners();
        getLocalData();
        getUserAvatar();
    }

    private void bindUI(){
        textViewAccountUsername = findViewById(R.id.textViewAccountUsername);
        textViewAccountFollowersNumber = findViewById(R.id.textViewAccountFollowersNumber);
        textViewAccountFollowingNumber = findViewById(R.id.textViewAccountFollowingNumber);
        textViewAccountDescription = findViewById(R.id.textViewAccountDescription);
        imageButtonAccountBackArrow = findViewById(R.id.imageButtonAccountBackArrow);
        imageViewAccountAvatar = findViewById(R.id.imageViewAccountAvatar);
    }

    private void setListeners(){
        imageButtonAccountBackArrow.setOnClickListener(v -> onBackPressed());
        imageViewAccountAvatar.setOnClickListener(v -> showChooseAvatarDialog());
    }

    @Override
    public void onBackPressed() {
        Intent intent = new Intent(AccountActivity.this, MainActivity.class);
        startActivity(intent);
        finish();
    }

    private void getLocalData(){
        user = gson.fromJson(sharedPreferences.getString("user", ""), User.class);
        if(user != null){
            setLocalData();
        }else{
            Toast.makeText(context, getString(R.string.generic_error), Toast.LENGTH_SHORT).show();
        }
    }

    private void getUserAvatar() {
        Thread thread = new Thread() {
            @Override
            public void run() {
                Response response;
                try {
                    response = UserAvatarRequests.getAvatar(context, user.getAvatar_id());
                    String responseBody = Objects.requireNonNull(response.body()).string();
                    responseBody = responseBody.replace("\r\n", "");
                    if (response.code() == 200) {
                        UserAvatar userAvatar = gson.fromJson(responseBody, UserAvatar.class);
                        sharedPreferences.edit().putString("userAvatar", gson.toJson(userAvatar)).apply();
                        getAvatars();
                    }
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        };
        thread.start();
    }

    private void getAvatars(){
        Thread threadGetAvatars = new Thread() {
            @Override
            public void run() {
                Response response;
                try {
                    response = UserAvatarRequests.getAvatars(context);
                    String responseBody = Objects.requireNonNull(response.body()).string();
                    if (response.code() == 200) {
                        userAvatarList.clear();
                        JSONArray responseArray = new JSONArray(responseBody);
                        for (int i = 0; i < responseArray.length(); i++) {
                            String jsonObjectString = responseArray.getJSONObject(i).toString();
                            userAvatarList.add(gson.fromJson(jsonObjectString, UserAvatar.class));
                        }
                        sharedPreferences.edit().putString("userAvatars", gson.toJson(userAvatarList)).apply();
                        getApiData();
                    }
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        };
        threadGetAvatars.start();
    }

    private void getApiData(){
        Thread threadGetUserById = new Thread() {
            @Override
            public void run() {
                Response response;
                try {
                    response = UserRequests.getUserById(context, user.getId());
                    String responseBody = Objects.requireNonNull(response.body()).string();
                    responseBody = responseBody.replace("\r\n", "");
                    if (response.code() == 200) {
                        user = gson.fromJson(responseBody, User.class);
                        sharedPreferences.edit().putString("user", gson.toJson(user)).apply();
                        setApiData();
                    }
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        };
        threadGetUserById.start();
    }

    private void setLocalData(){
        textViewAccountUsername.setText(user.getUsername());
        textViewAccountDescription.setText(user.getDescription());
    }

    private void setApiData(){
        Thread thread = new Thread() {
            public void run() {
                runOnUiThread(() -> {
                    textViewAccountUsername.setText(user.getUsername());
                    textViewAccountDescription.setText(user.getDescription());
                    userAvatar = userAvatarList.get(user.getAvatar_id());
                    Picasso.get().load(userAvatar.getAvatar_url()).into(imageViewAccountAvatar);
                });
            }
        };
        thread.start();
    }

    private void showChooseAvatarDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(AccountActivity.this);
        builder.setTitle(getString(R.string.change_avatar));
        final View customLayout = getLayoutInflater().inflate(R.layout.alert_dialog_choose_avatar, null);
        builder.setView(customLayout);
        alertDialogChooseAvatar = builder.create();
        ChooseAvatarAdapter chooseAvatarAdapter = new ChooseAvatarAdapter(AccountActivity.this, userAvatarList, alertDialogChooseAvatar, imageViewAccountAvatar);
        RecyclerView recyclerViewChooseAvatar = customLayout.findViewById(R.id.recyclerViewChooseAvatar);
        recyclerViewChooseAvatar.setLayoutManager(new GridLayoutManager(context, 3));
        recyclerViewChooseAvatar.setAdapter(chooseAvatarAdapter);
        alertDialogChooseAvatar.show();
    }
}

警报对话框布局：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="5dp">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerViewChooseAvatar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Recyclerview 项目 XML：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="16dp">

    <ImageView
        android:id="@+id/imageViewChooseAvatar"
        android:layout_width="50sp"
        android:layout_height="50sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

RecyclerView 适配器：

    public class ChooseAvatarAdapter extends RecyclerView.Adapter<ChooseAvatarAdapter.ChooseAvatarAdapterViewHolder> {

    private final Context context;
    private final List<UserAvatar> userAvatarList;
    private final AlertDialog alertDialogAvatar;
    private final ImageView imageViewAvatar;

    public ChooseAvatarAdapter(Context context, List<UserAvatar> userAvatarList, AlertDialog alertDialogAvatar, ImageView imageViewAvatar) {
        this.context = context;
        this.userAvatarList = userAvatarList;
        this.alertDialogAvatar = alertDialogAvatar;
        this.imageViewAvatar = imageViewAvatar;
    }

    @NonNull
    @NotNull
    @Override
    public ChooseAvatarAdapter.ChooseAvatarAdapterViewHolder onCreateViewHolder(@NonNull @NotNull ViewGroup parent, int viewType) {
        return new ChooseAvatarAdapterViewHolder(LayoutInflater.from(context).inflate(R.layout.alert_dialog_choose_avatar_item, parent, false));
    }

    @Override
    public void onBindViewHolder(@NonNull @NotNull ChooseAvatarAdapter.ChooseAvatarAdapterViewHolder holder, int position) {
        Picasso.get()
                .load(userAvatarList.get(position).getAvatar_url())
                .into(holder.imageViewChooseAvatar);
        holder.imageViewChooseAvatar.setOnClickListener(v -> {
            alertDialogAvatar.dismiss();
            AlertDialog.Builder builder = new AlertDialog.Builder(context);
            builder.setMessage(context.getString(R.string.confirm_avatar_change))
                    .setPositiveButton(context.getString(R.string.yes), (dialog, which) -> {
                        Gson gson = new Gson();
                        SharedPreferences sharedPreferences = context.getSharedPreferences(Constants.sharedPreferencesDocName, Context.MODE_PRIVATE);
                        User user = gson.fromJson(sharedPreferences.getString("user", ""), User.class);
                        user.setAvatar_id(position);
                        sharedPreferences.edit().putString("user", gson.toJson(user)).apply();
                        Thread thread = new Thread() {
                            @Override
                            public void run() {
                                Response response;
                                try {
                                    response = UserRequests.editUserAvatar(context, user.getId(), position);
                                    if (response.code() == 200) {
                                        dialog.dismiss();
                                        ((AccountActivity) context).runOnUiThread(() -> Picasso.get()
                                                .load(userAvatarList.get(position).getAvatar_url())
                                                .into(imageViewAvatar));
                                    }
                                } catch (Exception ex) {
                                    ex.printStackTrace();
                                }
                            }
                        };
                        thread.start();
                    })
                    .setNegativeButton(context.getString(R.string.no), (dialog, which) -> dialog.cancel())
                    .create()
                    .show();
        });
    }

    @Override
    public int getItemCount() {
        return userAvatarList.size();
    }

    public static class ChooseAvatarAdapterViewHolder extends RecyclerView.ViewHolder {
        ImageView imageViewChooseAvatar;

        public ChooseAvatarAdapterViewHolder(View itemView) {
            super(itemView);
            imageViewChooseAvatar = itemView.findViewById(R.id.imageViewChooseAvatar);
        }
    }
}

重复回收站视图中的第一项

0 个答案: