Android ArrayList无法强制转换为Parcelable

我发现以下错误：

• Key com..BookStatus应为Parcelable，但值为ArrayList
• ClassCastException:无法将ArrayList转换为Parcelable ->和therafter:无法启动活动-NullPointerException
• ArrayList确实具有BookStatus对象的值（listToPass）
  • Key com.example.books.BookStatus应为Parcelable，但值为java.util.ArrayList。返回了默认值
  • 尝试强制转换生成的内部异常：
  • java.lang.ClassCastException:java.util.ArrayList不能强制转换为android.os.Parcelable
  • 在com.example.books4locals.SearchActivity.onCreate（SearchActivity.java:46）->这是bundle.getparcelable方法

我能做什么

HomeActivity.java

    ArrayList<BookStatus> listToPass = new ArrayList<BookStatus>(); // fill with smthg

        protected void onPostExecute(String result) {

            if (listToPass != null) {

                Intent i = new Intent(getApplicationContext(),
                        SearchActivity.class);
                //              ArrayList<BookStatus> bs = new ArrayList<BookStatus> (Arrays.asList(bArr));

                i.putParcelableArrayListExtra("com.example.books.BookStatus", listToPass);
                startActivity(i);

          protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.searchactivity_main);

            Bundle bundle = getIntent().getExtras();
            ArrayList<BookStatus> bookStatus = bundle
                    .getParcelable("com.example.books.BookStatus");

         public class BookStatus implements Parcelable {

        public BookStatus() {
        }

        public BookStatus(Parcel in) {
            this.bookId=in.readInt();

            this.address=in.readString();
            this.name=in.readString();
            this.author=in.readString();
            this.lenderUserId=in.readInt();
            this.isbn=in.readInt();
            this.postcode=in.readString();
            this.town=in.readString();
            this.telnumber=in.readString();
            this.mail=in.readString();
            this.duration=in.readInt();
            }
                        @Override
            public int describeContents() {
                // TODO Auto-generated method stub
                return 0;
            }

            @Override
            public void writeToParcel(Parcel dest, int flags) {
                dest.writeInt(this.bookId);

                dest.writeString(this.address);
                dest.writeString(this.name);
                dest.writeString(this.author);
                dest.writeInt(this.lenderUserId);
                dest.writeInt(this.isbn);
                dest.writeString(this.postcode);
                dest.writeString(this.town);
                dest.writeString(this.telnumber);
                dest.writeString(this.mail);
                dest.writeInt(this.duration);

            }

             public void readFromParcel(Parcel parcel){
                    this.bookId = parcel.readInt();
                    this.address = parcel.readString();

                    this.name = parcel.readString();
                    this.author = parcel.readString();
                    this.lenderUserId = parcel.readInt();
                    this.isbn = parcel.readInt();
                    this.postcode = parcel.readString();
                    this.town = parcel.readString();
                    this.telnumber = parcel.readString();
                    this.mail = parcel.readString();
                    this.duration = parcel.readInt();
                  }




            public static final Parcelable.Creator<BookStatus> CREATOR = new Parcelable.Creator<BookStatus>() {

                 public BookStatus createFromParcel(Parcel in) {
             return new BookStatus(in);
         }

                 public BookStatus[] newArray(int size) {
             return new BookStatus[size];
         }
        };

ArrayList listToPass=new ArrayList（）；//填充smthg
受保护的void onPostExecute（字符串结果）{
如果（listToPass！=null）{
意图i=新意图（getApplicationContext（），
搜索活动（类）；
//ArrayList bs=新的ArrayList（Arrays.asList（bArr））；
i、 putParcelableArrayListExtra（“com.example.books.BookStatus”，listToPass）；
星触觉（i）；

SearchActivity.java

    ArrayList<BookStatus> listToPass = new ArrayList<BookStatus>(); // fill with smthg

        protected void onPostExecute(String result) {

            if (listToPass != null) {

                Intent i = new Intent(getApplicationContext(),
                        SearchActivity.class);
                //              ArrayList<BookStatus> bs = new ArrayList<BookStatus> (Arrays.asList(bArr));

                i.putParcelableArrayListExtra("com.example.books.BookStatus", listToPass);
                startActivity(i);

          protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.searchactivity_main);

            Bundle bundle = getIntent().getExtras();
            ArrayList<BookStatus> bookStatus = bundle
                    .getParcelable("com.example.books.BookStatus");

         public class BookStatus implements Parcelable {

        public BookStatus() {
        }

        public BookStatus(Parcel in) {
            this.bookId=in.readInt();

            this.address=in.readString();
            this.name=in.readString();
            this.author=in.readString();
            this.lenderUserId=in.readInt();
            this.isbn=in.readInt();
            this.postcode=in.readString();
            this.town=in.readString();
            this.telnumber=in.readString();
            this.mail=in.readString();
            this.duration=in.readInt();
            }
                        @Override
            public int describeContents() {
                // TODO Auto-generated method stub
                return 0;
            }

            @Override
            public void writeToParcel(Parcel dest, int flags) {
                dest.writeInt(this.bookId);

                dest.writeString(this.address);
                dest.writeString(this.name);
                dest.writeString(this.author);
                dest.writeInt(this.lenderUserId);
                dest.writeInt(this.isbn);
                dest.writeString(this.postcode);
                dest.writeString(this.town);
                dest.writeString(this.telnumber);
                dest.writeString(this.mail);
                dest.writeInt(this.duration);

            }

             public void readFromParcel(Parcel parcel){
                    this.bookId = parcel.readInt();
                    this.address = parcel.readString();

                    this.name = parcel.readString();
                    this.author = parcel.readString();
                    this.lenderUserId = parcel.readInt();
                    this.isbn = parcel.readInt();
                    this.postcode = parcel.readString();
                    this.town = parcel.readString();
                    this.telnumber = parcel.readString();
                    this.mail = parcel.readString();
                    this.duration = parcel.readInt();
                  }




            public static final Parcelable.Creator<BookStatus> CREATOR = new Parcelable.Creator<BookStatus>() {

                 public BookStatus createFromParcel(Parcel in) {
             return new BookStatus(in);
         }

                 public BookStatus[] newArray(int size) {
             return new BookStatus[size];
         }
        };

创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.searchactivity_main）；
Bundle Bundle=getIntent（）.getExtras（）；
ArrayList bookStatus=bundle
.getParcelable（“com.example.books.BookStatus”）；

BookStatus.java

    ArrayList<BookStatus> listToPass = new ArrayList<BookStatus>(); // fill with smthg

        protected void onPostExecute(String result) {

            if (listToPass != null) {

                Intent i = new Intent(getApplicationContext(),
                        SearchActivity.class);
                //              ArrayList<BookStatus> bs = new ArrayList<BookStatus> (Arrays.asList(bArr));

                i.putParcelableArrayListExtra("com.example.books.BookStatus", listToPass);
                startActivity(i);

          protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.searchactivity_main);

            Bundle bundle = getIntent().getExtras();
            ArrayList<BookStatus> bookStatus = bundle
                    .getParcelable("com.example.books.BookStatus");

         public class BookStatus implements Parcelable {

        public BookStatus() {
        }

        public BookStatus(Parcel in) {
            this.bookId=in.readInt();

            this.address=in.readString();
            this.name=in.readString();
            this.author=in.readString();
            this.lenderUserId=in.readInt();
            this.isbn=in.readInt();
            this.postcode=in.readString();
            this.town=in.readString();
            this.telnumber=in.readString();
            this.mail=in.readString();
            this.duration=in.readInt();
            }
                        @Override
            public int describeContents() {
                // TODO Auto-generated method stub
                return 0;
            }

            @Override
            public void writeToParcel(Parcel dest, int flags) {
                dest.writeInt(this.bookId);

                dest.writeString(this.address);
                dest.writeString(this.name);
                dest.writeString(this.author);
                dest.writeInt(this.lenderUserId);
                dest.writeInt(this.isbn);
                dest.writeString(this.postcode);
                dest.writeString(this.town);
                dest.writeString(this.telnumber);
                dest.writeString(this.mail);
                dest.writeInt(this.duration);

            }

             public void readFromParcel(Parcel parcel){
                    this.bookId = parcel.readInt();
                    this.address = parcel.readString();

                    this.name = parcel.readString();
                    this.author = parcel.readString();
                    this.lenderUserId = parcel.readInt();
                    this.isbn = parcel.readInt();
                    this.postcode = parcel.readString();
                    this.town = parcel.readString();
                    this.telnumber = parcel.readString();
                    this.mail = parcel.readString();
                    this.duration = parcel.readInt();
                  }




            public static final Parcelable.Creator<BookStatus> CREATOR = new Parcelable.Creator<BookStatus>() {

                 public BookStatus createFromParcel(Parcel in) {
             return new BookStatus(in);
         }

                 public BookStatus[] newArray(int size) {
             return new BookStatus[size];
         }
        };

公共类BookStatus实现可包裹{
公共图书状态（）{
}
公共图书状态（包裹中）{
this.bookId=in.readInt（）；
this.address=in.readString（）；
this.name=in.readString（）；
this.author=in.readString（）；
this.lenderUserId=in.readInt（）；
this.isbn=in.readInt（）；
this.postcode=in.readString（）；
this.town=in.readString（）；
this.telnumber=in.readString（）；
this.mail=in.readString（）；
this.duration=in.readInt（）；
}
@凌驾
公共int描述内容（）{
//TODO自动生成的方法存根
返回0；
}
@凌驾
公共无效写入包裹（包裹目的地，内部标志）{
目的写入（此bookId）；
目的地记录（本地址）；
目的地记录（此名称）；
目的地书面限制（该作者）；
目的地写入（this.lenderUserId）；
目的地写入（本isbn）；
目的地写网线（此邮政编码）；
目的地（本镇）；
目的地writeString（此电话号码）；
目的地书面限制（本邮件）；
目的写入（此持续时间）；
}
公共无效readFromParcel（地块）{
this.bookId=parcel.readInt（）；
this.address=parcel.readString（）；
this.name=parcel.readString（）；
this.author=parcel.readString（）；
this.lenderUserId=parcel.readInt（）；
this.isbn=parcel.readInt（）；
this.postcode=parcel.readString（）；
this.town=parcel.readString（）；
this.telnumber=parcel.readString（）；
this.mail=parcel.readString（）；
this.duration=parcel.readInt（）；
}
public static final Parcelable.Creator=新建Parcelable.Creator（）{
公共图书状态createFromParcel（包裹中）{
返回新的BookStatus（in）；
}
public BookStatus[]新数组（整数大小）{
返回新的BookStatus[大小]；
}
};

尝试更改

 i.putParcelableArrayListExtra("com.example.books.BookStatus", listToPass);

到

及

到

---

它应该是getParcelableArrayListExtra，而不是getParcelableArrayList。