Android 实现具有 hashmap 的 Parcelable 对象 [英] Android implement Parcelable object which has hashmap

问题描述

我有这样的课程.

public class RateData  {
    Map<String, List<RateDTO>> rateMap;
}

public class RateDTO {

     private String code;

     private String name;

     private String value;
}

现在我需要可打包这个 RateData 类.我认为我们不能把这个 rateMap 打包成普通变量.

Now I need parcelable this RateData class. I think we can not parcel this rateMap as normal variable.

请给我一个如何做到这一点的例子.

Please give me an example how to do this.

推荐答案

你应该使 DateRTO Parcelable - 这应该是微不足道的.然后，

You should make DateRTO Parcelable - this should be trivial. Then,

Map<String, List<RateDTO>> map;

public void writeToParcel(Parcel out, int flags) {
    out.writeInt(map.size());

    for (Map.Entry<String, List<RateDTO>> entry : map.entrySet()) {
        out.writeString(entry.getKey());

        final List<RateDTO> list = entry.getValue();
        final int listLength = list.size();

        out.writeInt(listLength);

        for (RateDTO item: list) {
            out.writeParcelable(item, 0);
        }
    }
}

private MyParcelable(Parcel in) {
    final int size = in.readInt();

    for (int i = 0; i < size; i++) {
        final String key = in.readString();
        final int listLength = in.readInt();

        final List<RateDTO> list = new ArrayList<RateDTO>(listLength);
        for (int j = 0; j < listLength; j++) {
            final RateDTO value = in.readParcelable(ParentClass.class.getClassLoader());
            list.add(value);
        }

        map.put(key, list);
    }
}

我还没有测试过代码，但我相信它应该接近 OK.请注意，如果您的地图相对较大，则此解决方案不是特别好.

I haven't tested the code, but I believe it should be close to OK. Note that this solution is not particularly good if your map is relatively large.

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