Question

如何在ArrayList之间传递ArrayList<ArrayList<CustomObject>>类型的activites？我已经使用Parcelable模型类实现了customObject。当我像intent.putParcelableArrayListExtra("catVideoList", categoriesVideoList)那样传递时，它会给出错误。我知道如何将ArrayList传递给ArrayList<CustomObject>。

以下是我的模特课程：

public class VideoContentModel implements Parcelable {
    String videoId;
    String videoUrl;
    String videoTitle;
    String videoDescription;
    String videoThumbnailUrl;
    String videoDuration;
    String videoBitrate;
    String videoPublishDate;
    String videoCreateDate;
    String videoUpdateDate;
    String videoChannelId;
    String videoChannelName;
    String videoFeedType;

    public VideoContentModel(String videoId, String videoUrl, String videoTitle,
                             String videoThumbnailUrl, String videoDuration,
                             String videoBitrate, String videoPublishDate, String videoCreateDate,
                             String videoUpdateDate, String videoChannelId, String videoChannelName,
                             String videoFeedType, String videoDescription) 
    {
        this.videoId = videoId;
        this.videoUrl = videoUrl;
        this.videoTitle = videoTitle;
        this.videoThumbnailUrl = videoThumbnailUrl;
        this.videoDuration = videoDuration;
        this.videoBitrate = videoBitrate;
        this.videoPublishDate = videoPublishDate;
        this.videoCreateDate = videoCreateDate;
        this.videoUpdateDate = videoUpdateDate;
        this.videoChannelId = videoChannelId;
        this.videoChannelName = videoChannelName;
        this.videoFeedType = videoFeedType;
        this.videoDescription = videoDescription;
    }

    public String getVideoId() {
        return videoId;
    }

    public String getVideoUrl() {
        return videoUrl;
    }

    public String getVideoTitle() {
        return videoTitle;
    }

    public String getVideoDescription() {
        return videoDescription;
    }

    public String getVideoThumbnailUrl() {
        return videoThumbnailUrl;
    }

    public String getVideoDuration() {
        return videoDuration;
    }

    public String getVideoBitrate() {
        return videoBitrate;
    }

    public String getVideoPublishDate() {
        return videoPublishDate;
    }

    public String getVideoCreateDate() {
        return videoCreateDate;
    }

    public String getVideoUpdateDate() {
        return videoUpdateDate;
    }

    public String getVideoChannelId() {
        return videoChannelId;
    }

    public String getVideoChannelName() {
        return videoChannelName;
    }

    public String getVideoFeedType() {
        return videoFeedType;
    }

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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(this.videoId);
        dest.writeString(this.videoUrl);
        dest.writeString(this.videoTitle);
        dest.writeString(this.videoDescription);
        dest.writeString(this.videoThumbnailUrl);
        dest.writeString(this.videoDuration);
        dest.writeString(this.videoBitrate);
        dest.writeString(this.videoPublishDate);
        dest.writeString(this.videoCreateDate);
        dest.writeString(this.videoUpdateDate);
        dest.writeString(this.videoChannelId);
        dest.writeString(this.videoChannelName);
        dest.writeString(this.videoFeedType);
    }

    protected VideoContentModel(Parcel in) {
        this.videoId = in.readString();
        this.videoUrl = in.readString();
        this.videoTitle = in.readString();
        this.videoDescription = in.readString();
        this.videoThumbnailUrl = in.readString();
        this.videoDuration = in.readString();
        this.videoBitrate = in.readString();
        this.videoPublishDate = in.readString();
        this.videoCreateDate = in.readString();
        this.videoUpdateDate = in.readString();
        this.videoChannelId = in.readString();
        this.videoChannelName = in.readString();
        this.videoFeedType = in.readString();
    }

    public static final Parcelable.Creator<VideoContentModel> CREATOR = new Parcelable.Creator<VideoContentModel>() {
        @Override
        public VideoContentModel createFromParcel(Parcel source) {
            return new VideoContentModel(source);
        }

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

Answer 1

这里不需要Parcelable，因为您使用的是简单对象（String）。 ArrayList实现了Serializable，你的CustomObject也是如此。更改后，您可以使用

intent.putExtra("name", yourArrayList);

或

Bundle bundle = new Bundle();
bundle.putSerializable("name", yourArrayList);

Intent intent = new Intent(context, yourActivity.class);
intent.putExtras(bundle);

并在第二项活动中检索它。

Answer 2

您可以使用Gson库，无需实现parcelable。

假设你的arraylist是：

ArrayList<ArrayList<CustomObject>> outer = new ArrayList<>();

填充后，您可以将其添加到意图中，如下所示：

Intent i = new Intent(Activity1.this, Activity2.class);
i.putExtra("randomdata", new Gson().toJson(outer));

您可以稍后在Activity2中检索此内容，如下所示：

String extra = getIntent().getStringExtra("randomdata");
ArrayList<ArrayList<CustomObject>> list = new Gson().fromJson(extra, new TypeToken<ArrayList<ArrayList<CustomObject>>>(){}.getType());

希望它有所帮助。

如何传递ArrayList <arraylist <customtype>＆gt;活动之间

2 个答案: