Toast 未在 android 工作室中显示

Question

你好，我正在尝试做一个小项目，但我有一个错误，当我点击一个按钮时，它没有执行预期的操作，即显示祝酒词，并且没有错误，这让我感到困惑一个初学者并尝试使用调试器进行调试但没有任何帮助所以我希望你能帮助我并谢谢你

活动：

public class Book_Actvity extends AppCompatActivity {
    private static final String TAG = "Book_Actvity";
    public static final String BOOK_ID = "bookId";
    private ImageView imgBook;
    private TextView txtBookName, txtAuthor, txtPages, txtShortDescreption, txtLongDescreption;
    private Button btnCurrentlyReading, btnWantToRead, btnAlreadyRead, btnAddToFavorites;
    boolean exist;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.book_actvity);
        initViews();
        Intent intent = getIntent();
        if (intent != null) {
            int bookId = intent.getIntExtra(BOOK_ID, 0);
            if (bookId != 0) {
                Book book1 = Utils.getInstance().getBookById(bookId);
                if (null != book1) {
                    setData(book1);
                    addToALreadyReady(book1); } } } }

    private void initViews() {
        imgBook = findViewById(R.id.imgBookInTheBookActvity);
        txtBookName = findViewById(R.id.bookName);
        txtAuthor = findViewById(R.id.txtAuthorNameInBookActivity);
        txtPages = findViewById(R.id.txtPagesNum);
        txtShortDescreption = findViewById(R.id.txtDescreptionInBookActivity);
        txtLongDescreption = findViewById(R.id.txtLongDescreption);
        btnCurrentlyReading = findViewById(R.id.btnCurrentlyReading);
        btnWantToRead = findViewById(R.id.btnWantToReadInBookActvity);
        btnAlreadyRead = findViewById(R.id.btnAlreadyReadinBookActvity);
        btnAddToFavorites = findViewById(R.id.btnAddToFavoritesInBookActvity); }

    private void setData(Book book) {
        txtBookName.setText(book.getName());
        txtAuthor.setText(book.getAuthor());
        txtPages.setText(String.valueOf(book.getPages()));
        txtShortDescreption.setText(book.getShortDesc());
        txtLongDescreption.setText(book.getLongDesc());
        Glide.with(this).asBitmap().load(book.getImageUrl()).into(imgBook); }

    private void addToALreadyReady(final Book book) {
        ArrayList<Book> ArrayListAlreadyReadBook = Utils.getInstance().getAlreadyReadArrayList();
        exist = false;
        for (Book b : ArrayListAlreadyReadBook) {
            if (b.getId() == book.getId()) {
                exist = true; }
            if (exist) {
                btnAlreadyRead.setEnabled(false);
            } else {
                btnAlreadyRead.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        if (Utils.getInstance().addToAlreadyReadBooks(book)) {
                            Toast.makeText(Book_Actvity.this, "BOOK ADDED", Toast.LENGTH_SHORT).show();
                            System.out.println("DONE");
                        } else {
                            Toast.makeText(Book_Actvity.this, "SOMTHING WRONG",       Toast.LENGTH_SHORT).show();
                            System.out.println("NOT DONE");
                        }
                    }}); } }}}

还有 Utils Class:

    package com.example.newbookstoreplzwork;

import java.util.ArrayList;

public class Utils {
    public static Utils instance;
    private static ArrayList<Book> allBooksArrayList;
    private static ArrayList<Book> currentlyReadingArrayList;
    private static ArrayList<Book> AlreadyReadArrayList;
    private static ArrayList<Book> wishListArrayList;
    private static ArrayList<Book> favoritesArrayList;

    private Utils() {
        if (null == allBooksArrayList) {
            allBooksArrayList = new ArrayList<>();
            initData();
        }
        if (currentlyReadingArrayList == null) {
            currentlyReadingArrayList = new ArrayList<>();

        }
        if (AlreadyReadArrayList == null) {
            AlreadyReadArrayList = new ArrayList<>();

        }
        if (wishListArrayList == null) {
            wishListArrayList = new ArrayList<>();

        }
        if (favoritesArrayList == null) {
            favoritesArrayList = new ArrayList<>();

        }
    }


    private void initData() {
        allBooksArrayList.add(new Book(1, "wimpy kid", "karam Shadi", 134, "https://kbimages1-a.akamaihd.net/a93f1391-68be-478b-acb0-63cd7881aed8/1200/1200/False/the-getaway-diary-of-a-wimpy-kid-book-12.jpg",
                "asdfasd", "jhkjhkhkjhkjghjghgfg"));
        allBooksArrayList.add(new Book(2, "majduddin Book", "majduddin", 90, "https://s3images.coroflot.com/user_files/individual_files/702459_am5ekrun22pd6wav_kbesce8q.png ", "long", "dodo"));

    }

    public static Utils getInstance() {
        if (instance != null) {

            return instance;
        } else {
            instance = new Utils();
            return instance;
        }
    }

    public static ArrayList<Book> getAllBooksArrayList() {
        return allBooksArrayList;
    }

    public static ArrayList<Book> getCurrentlyReadingArrayList() {
        return currentlyReadingArrayList;
    }

    public static ArrayList<Book> getAlreadyReadArrayList() {
        return AlreadyReadArrayList;
    }

    public static ArrayList<Book> getWishListArrayList() {
        return wishListArrayList;
    }

    public static ArrayList<Book> getFavoritesArrayList() {
        return favoritesArrayList;
    }

    public Book getBookById(int id) {
        for (Book b : allBooksArrayList) {
            if (b.getId() == id) {
                return b;
            }
        }
        return null;
    }

    public boolean addToAlreadyReadBooks(Book book) {
        return AlreadyReadArrayList.add(book);
    }
}

XML:

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Book_Actvity">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <RelativeLayout
            android:id="@+id/componentsRealtiveLayout"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <ImageView
                android:id="@+id/imgBookInTheBookActvity"
                android:layout_width="150dp"
                android:layout_height="200dp"
                android:layout_centerHorizontal="false"
                android:layout_marginLeft="30dp"
                android:layout_marginTop="30dp"
                android:padding="16dp"
                android:src="@mipmap/ic_launcher" />

            <Button
                android:id="@+id/btnCurrentlyReading"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="false"
                android:layout_marginLeft="300dp"
                android:layout_marginTop="120dp"
                android:text="Currently Reading" />

            <Button
                android:id="@+id/btnWantToReadInBookActvity"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/btnCurrentlyReading"
                android:layout_marginLeft="300dp"
                android:layout_marginTop="24dp"
                android:text="Want To Read" />

            <Button
                android:id="@+id/btnAlreadyReadinBookActvity"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/btnWantToReadInBookActvity"
                android:layout_marginLeft="300dp"
                android:layout_marginTop="24dp"

                android:text="Already Read" />

            <Button
                android:id="@+id/btnAddToFavoritesInBookActvity"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/btnAlreadyReadinBookActvity"
                android:layout_marginLeft="300dp"
                android:layout_marginTop="24dp"

                android:text="Add to Favorites" />

            <TextView
                android:id="@+id/txtPages"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/txtAuthorInBookActivity"
                android:layout_marginTop="24dp"
                android:text="Pages" />

            <TextView
                android:id="@+id/bookName"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/imgBookInTheBookActvity"
                android:layout_marginTop="130dp"
                android:text="Book Name" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/imgBookInTheBookActvity"
                android:layout_marginLeft="24dp"
                android:layout_marginTop="130dp"
                android:layout_toRightOf="@id/bookName"
                android:text="Wimpy Kid" />

            <TextView
                android:id="@+id/txtAuthorInBookActivity"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/bookName"
                android:layout_marginTop="24dp"
                android:text="Author" />

            <TextView
                android:id="@+id/txtDescreptionInBookActivity"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/txtPages"
                android:layout_marginTop="24dp"
                android:text="Descreption" />

            <TextView
                android:id="@+id/txtLongDescreption"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/txtDescreptionInBookActivity"
                android:layout_marginTop="24dp"
                android:text="Long Descreption" />

            <TextView
                android:id="@+id/txtAuthorNameInBookActivity"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/bookName"
                android:layout_marginLeft="50dp"
                android:layout_marginTop="24dp"
                android:layout_toRightOf="@id/txtAuthorInBookActivity"
                android:text="Jeff Kinney" />

            <TextView
                android:id="@+id/txtPagesNum"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@id/txtAuthorInBookActivity"
                android:layout_marginLeft="20dp"
                android:layout_marginTop="25dp"
                android:layout_toRightOf="@id/bookName"
                android:text="150" />
        </RelativeLayout>

    </ScrollView>


    
</RelativeLayout>

感谢所有试图提供帮助的人

Answer 1

试试这个来了解问题：

private void addToALreadyReady(final Book book) {
        ArrayList<Book> ArrayListAlreadyReadBook = Utils.getInstance().getAlreadyReadArrayList();
        exist = false;
        for (Book b : ArrayListAlreadyReadBook) {
            if (b.getId() == book.getId()) {
                exist = true; 
                break;
            }
            
        }

        btnAlreadyRead.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(!exist) {
                    if (Utils.getInstance().addToAlreadyReadBooks(book)) {
                        Toast.makeText(Book_Actvity.this, "BOOK ADDED", Toast.LENGTH_SHORT).show();
                        System.out.println("DONE");
                    } else {
                        Toast.makeText(Book_Actvity.this, "SOMTHING WRONG", Toast.LENGTH_SHORT).show();
                        System.out.println("NOT DONE");
                    }
                }else {
                    Toast.makeText(Book_Actvity.this, "EXIST TRUE", Toast.LENGTH_SHORT).show();
                    System.out.println("EXISTS");
                }
            }
        });
        
    }

Toast 未在 android 工作室中显示

Toast not showing in android studio

java

xml

android

toast

android-studio