26

固定：底部的答案

我正在为一个项目编写一个 android 应用程序，并且我正在尝试使用 parcelable 对象。我有2个parcalable类。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和具有第一个类的类型和它的附加对象的列表。

每次我尝试将第二类的对象传递给另一个 Activity 时，我都会在解组时得到 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，错误不会出现..

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 我终于找到了错误，我简直不敢相信！！！

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

不敢相信，但现在它起作用了。对于每一个遇到相同错误的人，请检查 writeToParcel 和 readFromParcel 的顺序。Thay 的顺序必须相同。

祝你有美好的一天，克里斯蒂安**

4

3 回答 3

44

FIX 我终于找到了错误，我简直不敢相信！！！

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

不敢相信，但现在它起作用了。对于每一个遇到相同错误的人，请检查 writeToParcel 和 readFromParcel 的顺序。Thay 的顺序必须相同。

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

于 2013-03-15T22:32:31.520 回答
1

@Override 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。

于 2017-05-12T08:11:28.560 回答
1

对于偶然发现这个问题的人来说，上面的答案对我有用，但并不完全正确。我的问题是我的字段初始化程序的顺序不正确。

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，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();

在下面

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());
}
于 2020-05-08T22:08:07.863 回答