解组时出现ClassNotFoundException，真的不知道为什么

问题描述 投票：0回答：3

已修复：答案在底部

我正在为一个项目编写一个android应用程序，我正在尝试使用parcelable对象。 我有 2 个可分享的课程。第一个是只有 2 个参数的普通类。 第二个是一个具有附加属性的类和一个包含第一个类类型的列表及其附加对象。

每次我尝试将第二类的对象传递给另一个 Activity 时，解组时都会收到 android.os.BadParcelableException: ClassNotFoundException

应用程序关闭。

我现在搜索了几个小时并尝试了多种解决方案，但没有任何帮助。 当我只将第一类的对象传递给另一个活动时，不会出现错误..

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();
}
}

我的第二堂课：

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];
    }
};
}

请帮助我。

编辑：这是我的 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

修复 我终于发现了错误，我简直不敢相信！

搜索了近 1 1/2 天，所需要的只是切换 readFromParcel 或 writeToParcel 中的最后两个方法，因为它们的顺序不完全相同！！

简直不敢相信，但现在它起作用了。 对于每一个遇到同样错误的人，检查 writeToParcel 和 readFromParcel 的顺序。 它们必须处于相同的顺序。

祝你有美好的一天，克里斯蒂安**

android unmarshalling parcelable
3个回答
46
投票

修复我终于发现了错误，我简直不敢相信！！！

搜索了近 1 1/2 天，所需要的只是切换 readFromParcel 或 writeToParcel 中的最后两个方法，因为它们的顺序不完全相同！！

简直不敢相信，但现在它起作用了。对于每一个遇到同样错误的人，检查 writeToParcel 和 readFromParcel 的顺序。它们必须处于相同的顺序。

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

2
投票

对于偶然发现这个问题的人来说，上面的答案对我有用，但不完全正确。 我的问题是我的字段初始值设定项的顺序不正确。

代码是这样的：

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

在我的班级中，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());

以下代码修复了它：

protected Shop(Parcel in) {
    id = in.readInt();
    name = in.readString();
    contactInfo = in.readParcelable(ShopContactInfo.class.getClassLoader());
}
1
投票
@Override
public void writeToParcel(Parcel dest, int flags) {
    // could alternatively bundle first...

    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。

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