传递 Parcelable 对象的 ArrayList 会引发错误

Question

我有一个带有几个字符串的对象，一个 int 和另一个有 4 个内部对象的对象。他们都实现了 Parcelable。为了生成样板代码，我使用了 Android Studio 的 Parcelable 插件。

尽管所有对象都是可打包的，但我收到以下错误：android.os.BadParcelableException: ClassNotFoundException when unmarshalling: AlbumTrackResponse

POJO 的外观如下：

主要对象：

public class AlbumTrackResponse implements Parcelable {

private String id;
private String albumId;
private String position;
private String title;
private int rate;
private AllServices services;

public AllServices getServices() {
    return services;
}

public void setServices(AllServices services) {
    this.services = services;
}

public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id;
}

public String getAlbumId() {
    return albumId;
}

public void setAlbumId(String albumId) {
    this.albumId = albumId;
}

public String getPosition() {
    return position;
}

public void setPosition(String position) {
    this.position = position;
}

public String getTitle() {
    return title;
}

public void setTitle(String title) {
    this.title = title;
}

public int getRate() {
    return rate;
}

public void setRate(int rate) {
    this.rate = rate;
}


protected AlbumTrackResponse(Parcel in) {
    id = in.readString();
    albumId = in.readString();
    position = in.readString();
    title = in.readString();
    rate = in.readInt();
    services = (AllServices) in.readValue(AllServices.class.getClassLoader());
}

@Override
public int describeContents() {
    return 0;
}

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(id);
    dest.writeString(albumId);
    dest.writeString(position);
    dest.writeString(title);
    dest.writeInt(rate);
    dest.writeValue(services);
}

@SuppressWarnings("unused")
public static final Parcelable.Creator<AlbumTrackResponse> CREATOR = new Parcelable.Creator<AlbumTrackResponse>() {
    @Override
    public AlbumTrackResponse createFromParcel(Parcel in) {
        return new AlbumTrackResponse(in);
    }

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

}

4 个对象的内部对象

public class AllServices implements Parcelable {

private GigRevService gigrev;
private AppleService apple;
private GoogleService google;
private SpotifyService spotify;

protected AllServices(Parcel in) {
    gigrev = (GigRevService) in.readValue(GigRevService.class.getClassLoader());
    apple = (AppleService) in.readValue(AppleService.class.getClassLoader());
    google = (GoogleService) in.readValue(GoogleService.class.getClassLoader());
    spotify = (SpotifyService) in.readValue(SpotifyService.class.getClassLoader());
}

@Override
public int describeContents() {
    return 0;
}

public GigRevService getGigrev() {
    return gigrev;
}

public void setGigrev(GigRevService gigrev) {
    this.gigrev = gigrev;
}

public AppleService getApple() {
    return apple;
}

public void setApple(AppleService apple) {
    this.apple = apple;
}

public GoogleService getGoogle() {
    return google;
}

public void setGoogle(GoogleService google) {
    this.google = google;
}

public SpotifyService getSpotify() {
    return spotify;
}

public void setSpotify(SpotifyService spotify) {
    this.spotify = spotify;
}

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeValue(gigrev);
    dest.writeValue(apple);
    dest.writeValue(google);
    dest.writeValue(spotify);

}

@SuppressWarnings("unused")
public static final Parcelable.Creator<AllServices> CREATOR = new Parcelable.Creator<AllServices>() {
    @Override
    public AllServices createFromParcel(Parcel in) {
        return new AllServices(in);
    }

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

}

这里的内部对象只包含字符串项。

以下是我将 ArrayList 传递给捆绑包的方法：

    bundle.putParcelableArrayList(MediaPlayerService.TRACK_LIST, trackList);

我将项目从活动传递到服务。任何想法为什么我会收到此错误？

编辑：服务类的实现

public class GoogleService implements Parcelable {

private String name;
private String uri;

public String getUri() {
    return uri;
}

public void setUri(String uri) {
    this.uri = uri;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

protected GoogleService(Parcel in) {
    name = in.readString();
    uri = in.readString();
}

@Override
public int describeContents() {
    return 0;
}

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeString(name);
    dest.writeString(uri);
}

@SuppressWarnings("unused")
public static final Parcelable.Creator<GoogleService> CREATOR = new Parcelable.Creator<GoogleService>() {
    @Override
    public GoogleService createFromParcel(Parcel in) {
        return new GoogleService(in);
    }

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

}

Answer 1

这看起来非常奇怪

this.services = in.readParcelable(getClass().getClassLoader());

您指出了错误的类加载器。你必须像这样使用它

this.services = (AllServices)in.readParcelable(AllServices.class.getClassLoader());

除此之外，我总是使用这个网站http://www.parcelabler.com/ 来快速生成我的 Parceables。或者你可以这样使用它

services = (AllServices) in.readValue(AllServices.class.getClassLoader());

Answer 2

这里：

protected AllServices(Parcel in) { this.gigrev = in.readParcelable(getClass().getClassLoader()); 
this.apple = in.readParcelable(getClass().getClassLoader()); 
this.google = in.readParcelable(getClass().getClassLoader()); 
this.spotify = in.readParcelable(getClass().getClassLoader()); }

替换为

protected AllServices(Parcel in) { this.gigrev = in.readParcelable(GigRevService.class.getClassLoader()); 
this.apple = in.readParcelable(AppleService.class.getClassLoader()); 
this.google = in.readParcelable(GoogleService.class.getClassLoader()); 
this.spotify = in.readParcelable(SpotifyService.class.getClassLoader()); }

并替换：

 this.services = in.readParcelable(getClass().getClassLoader());

与：

this.services = in.readParcelable(AllServices.class.getClassLoader());

您还可以显示 GoogleService 等类吗？每个内部对象的类也必须有一个 Parcelable 创建者并实现 Parcelable 接口。