Question

固定：在底部回答

我正在为一个项目编写一个Android应用程序，我试图使用parcelable对象。我有2个可分类的课程。第一个是只有2个参数的普通类。第二个是具有附加属性的类，以及具有第一个类中的类型的列表以及它的附加对象。

每次我尝试将第二个类的对象传递给另一个Activity时，我得到android.os.BadParcelableException：解组时的ClassNotFoundException

，应用程序关闭。

我现在搜索了几个小时，尝试了多种解决方案，但没有任何帮助。当我只将第一个类的对象传递给另一个活动时，错误才会出现。

这是我的代码：

package de.softwareproject.v3.testclasses;

import android.os.Parcel;
import android.os.Parcelable;

public class Cart implements Parcelable {

private String name;
private Integer priceInCents;

public Cart() {}

public Cart(Parcel in){
    readFromParcel(in);
}

public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public Integer getPriceInCents() {
    return priceInCents;
}
public void setPriceInCents(Integer priceInCents) {
    this.priceInCents = priceInCents;
}

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

            @Override
            public Cart createFromParcel(Parcel source) {
                return new Cart(source);
            }

            @Override
            public Cart[] newArray(int size) {
                return new Cart[size];
            }
};

@Override
public int describeContents() {
    // TODO Auto-generated method stub
    return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(name);
    dest.writeInt(priceInCents);
}

private void readFromParcel(Parcel in) {
    name = in.readString();
    priceInCents = in.readInt();
}
}

我的第二课：

package de.softwareproject.v3.testclasses;

import java.util.ArrayList;
import java.util.List;
import android.os.Parcel;
import android.os.Parcelable;

public class CurrentUser implements Parcelable {

private String username;
private String eMail;
private String password;
private List<Cart> carts;
private Cart activeCart;

public CurrentUser() {}

public CurrentUser(Parcel in) {
    readFromParcel(in);
}

private void readFromParcel(Parcel in) {
    username = in.readString();
    eMail = in.readString();
    password = in.readString();
    activeCart = in.readParcelable(de.softwareproject.v3.testclasses.Cart.class.getClassLoader());
    if (carts == null){ carts = new ArrayList<Cart>(); }
    in.readTypedList(carts, Cart.CREATOR);
}

public String getUsername() {
    return username;
}
public void setUsername(String username) {
    this.username = username;
}
public String geteMail() {
    return eMail;
}
public void seteMail(String eMail) {
    this.eMail = eMail;
}
public String getPassword() {
    return password;
}
public void setPassword(String password) {
    this.password = password;
}
public List<Cart> getCarts() {
    return carts;
}
public void setCarts(List<Cart> carts) {
    this.carts = carts;
}
public Cart getActiveCart() {
    return activeCart;
}
public void setActiveCart(Cart activeCart) {
    this.activeCart = activeCart;
}

@Override
public int describeContents() {
    // TODO Auto-generated method stub
    return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(username);
    dest.writeString(eMail);
    dest.writeString(password);
    dest.writeTypedList(carts);
    dest.writeParcelable(activeCart, flags);
}

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

    @Override
    public CurrentUser createFromParcel(Parcel in) {
        return new CurrentUser(in);
    }

    @Override
    public CurrentUser[] newArray(int size) {
        return new CurrentUser[size];
    }
};
}

请帮帮我。

编辑：这里是我的Logcat

    03-15 16:24:08.139: E/Parcel(689): Class not found when unmarshalling: ??, e: java.lang.ClassNotFoundException: ??
    03-15 16:24:08.149: D/AndroidRuntime(689): Shutting down VM
    03-15 16:24:08.149: W/dalvikvm(689): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
    03-15 16:24:08.229: E/AndroidRuntime(689): FATAL EXCEPTION: main
    03-15 16:24:08.229: E/AndroidRuntime(689): java.lang.RuntimeException: Unable to start activity ComponentInfo{de.softwareproject.v3/de.softwareproject.v3.Startpage}: android.os.BadParcelableException: ClassNotFoundException when unmarshalling: ??
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.app.ActivityThread.access$600(ActivityThread.java:122)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.os.Handler.dispatchMessage(Handler.java:99)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.os.Looper.loop(Looper.java:137)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.app.ActivityThread.main(ActivityThread.java:4340)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at java.lang.reflect.Method.invokeNative(Native Method)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at java.lang.reflect.Method.invoke(Method.java:511)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at dalvik.system.NativeStart.main(Native Method)
    03-15 16:24:08.229: E/AndroidRuntime(689): Caused by: android.os.BadParcelableException: ClassNotFoundException when unmarshalling: ??
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.os.Parcel.readParcelable(Parcel.java:1966)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at de.softwareproject.v3.testclasses.CurrentUser.readFromParcel(CurrentUser.java:26)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at de.softwareproject.v3.testclasses.CurrentUser.<init>(CurrentUser.java:19)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at de.softwareproject.v3.testclasses.CurrentUser$1.createFromParcel(CurrentUser.java:80)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at de.softwareproject.v3.testclasses.CurrentUser$1.createFromParcel(CurrentUser.java:1)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.os.Parcel.readParcelable(Parcel.java:1992)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.os.Parcel.readValue(Parcel.java:1854)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.os.Parcel.readMapInternal(Parcel.java:2094)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.os.Bundle.unparcel(Bundle.java:223)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.os.Bundle.getParcelable(Bundle.java:1158)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at de.softwareproject.v3.Startpage.onCreate(Startpage.java:34)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.app.Activity.performCreate(Activity.java:4465)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
    03-15 16:24:08.229: E/AndroidRuntime(689):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
    03-15 16:24:08.229: E/AndroidRuntime(689):  ... 11 more
    03-15 16:24:10.289: I/Process(689): Sending signal. PID: 689 SIG: 9

FIX 我终于找到了这个错误，我只是不敢相信它！

搜索差不多1 1/2天，所需要的只是在readFromParcel或writeToParcel中切换最后两个方法，因为它们的顺序不完全相同!!

无法相信，但现在它有效。对于每个遇到同样错误的人，请检查writeToParcel和readFromParcel的顺序。 Thay必须按照相同的顺序。

祝你有个美好的一天，基督徒**

Answer 1

FIX我终于找到了这个错误，我只是不能相信它!!! ...

搜索差不多1 1/2天，所需要的只是在readFromParcel或writeToParcel中切换最后两个方法，因为它们的顺序不完全相同!!

无法相信，但现在它有效。对于每个遇到同样错误的人，请检查writeToParcel和readFromParcel的顺序。 Thay必须按照相同的顺序。

（Christian Risch自己解决了这个问题。不过，我相信这个网站的整洁。也许他会自己解决问题）

Answer 2

对于任何偶然发现此问题的人，以上答案对我来说都是有效的，但不完全是。我的问题是我的字段初始化器的顺序不正确。

代码如下：

protected Shop(Parcel in) {
    id = in.readInt();
    contactInfo = in.readParcelable(ShopContactInfo.class.getClassLoader());
    name = in.readString();
}

在我的课堂上，这些字段按以下顺序声明：

@SerializedName("Id")
public int id;

@SerializedName("Name")
public String name;

@SerializedName("ContactInfo")
public ShopContactInfo contactInfo;

注意

name = in.readString();

在

下

contactInfo = in.readParcelable(ShopContactInfo.class.getClassLoader());

以下代码对其进行了修复：

protected Shop(Parcel in) {
    id = in.readInt();
    name = in.readString();
    contactInfo = in.readParcelable(ShopContactInfo.class.getClassLoader());
}

Answer 3

@覆盖 public void writeToParcel（Parcel dest，int flags）{ //也可以先捆绑......

    dest.writeString(songs_id);
    dest.writeInt(check_song_favorite);
    dest.writeString(name);
    dest.writeString(track_image);
    dest.writeString(created_date);
    dest.writeString(status);
    dest.writeString(track);
    dest.writeString(artist_name);
    dest.writeString(uploader_name);
    dest.writeString(play_count);
    dest.writeString(share_count);
    dest.writeString(favorite_count);
    dest.writeString(genre);
    dest.writeString(user_id);
    dest.writeString(offline_download);
    dest.writeString(slug);
}

/**
 * Creates ArtistParcelable model from Parcel.
 */
public static final Parcelable.Creator<PlayerData> CREATOR = new Creator<PlayerData>() {
    @Override
    public PlayerData createFromParcel(Parcel source) {
        String songs_id = source.readString();
        int check_song_favorite = source.readInt();
        String name = source.readString();
        String track_image = source.readString();
        String created_date = source.readString();
        String status = source.readString();
        String track = source.readString();
        String artist_name = source.readString();
        String uploader_name = source.readString();
        String play_count = source.readString();
        String share_count = source.readString();
        String favorite_count = source.readString();
        String genre = source.readString();
        String user_id = source.readString();
        String offline_download = source.readString();
        String slug = source.readString();

        return new PlayerData(check_song_favorite,songs_id, name, created_date, track_image, status, track,
                artist_name, uploader_name, play_count, share_count, favorite_count,genre,user_id,offline_download,slug);
    }

    @Override
    public PlayerData[] newArray(int size) {
        return new PlayerData[size];
    }
};

尝试以相同的方式管理writeToParcel和readFromParcel。解决了我的问题。

解组时ClassNotFoundException并且真的不知道为什么

3 个答案: