Question

我在HashMap onSaveInstanceState()中的SupportMapFragment捆绑onSaveInstanceState()时遇到问题。

logcat消息如下：

E / AndroidRuntime（12445）：android.os.BadParcelableException：解组时的ClassNotFoundException：com.myapp.model.StationHashMap

已经尝试了一些解决方案：

在bundle.setClassLoader(getClass().getClassLoader());中，添加onSaveInstanceState()
在bundle.putSerializable(SAVE_INSTANCE_KEY_SATION_MAP, mStationMap);中，使用SupportMapFragment直接将 HashMap 放入捆绑包中，但logcat消息会更改为 com.myapp.model.Station 。

以下代码：

MapFragment.java ：扩展onSaveInstanceState()，我想在Parcelable中保存以前的状态数据
StationHashMap.java ：存储HashMap，实现Parcelable
Station.java ：存储所有电台数据，同时实施private HashMap<String, Station> mStationMap; ... @Override public void onSaveInstanceState(Bundle outState) { StationHashMap stationHashMap = new StationHashMap(); stationHashMap.setStationMap(mStationMap); outState.putParcelable(SAVE_INSTANCE_KEY_SATION_MAP, stationHashMap); }

MapFragment.java

public class StationHashMap implements Parcelable {
    private HashMap<String, Station> mStationMap = new HashMap<String, Station>();

    public StationHashMap() {
    }

    public void setStationMap(HashMap<String, Station> stationMap) {
        mStationMap = stationMap;
    }

    public HashMap<String, Station> getStationMap() {
        return mStationMap;
    }

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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        Log.d(this.toString(), "in writeToParcel()");

        final int mapSize = mStationMap.size();

        dest.writeInt(mapSize);

        if (mapSize > 0) {
            for (Map.Entry<String, Station> entry : mStationMap.entrySet()) {
                dest.writeString(entry.getKey());

                Station station = entry.getValue();

                dest.writeInt(station.getId());
                dest.writeInt(station.getNo());
                dest.writeString(station.getName());
                dest.writeString(station.getAddress());
                dest.writeDouble(station.getLat());
                dest.writeDouble(station.getLng());
                dest.writeString(station.getDesc());
                dest.writeInt(station.getBikeNum());
                dest.writeInt(station.getEmptyNum());
            }
        }

    }

    public static final Creator<StationHashMap> CREATOR = new Creator<StationHashMap>() {

        @Override
        public StationHashMap createFromParcel(Parcel source) {
            return new StationHashMap(source);
        }

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

    };

    private StationHashMap(Parcel source) {
        Log.d(this.toString(), "in StationHashMap()");

        final int mapSize = source.readInt();

        for (int i = 0; i < mapSize; i++) {
            String key = source.readString();
            Station station = new Station();

            station.setId(source.readInt());
            station.setNo(source.readInt());
            station.setName(source.readString());
            station.setAddress(source.readString());
            station.setLat(source.readDouble());
            station.setLng(source.readDouble());
            station.setDesc(source.readString());
            station.setBikeNum(source.readInt());
            station.setEmptyNum(source.readInt());

            mStationMap.put(key, station);
        }
    }
}

StationHashMap.java 中的方式来自：[问题]：Android:Passing a hash map between Activities

StationHashMap.java

public class Station implements Parcelable {
    private int mId;
    private int mNo;
    private String mName;

    public Station() {

    }

  // getters and setters...

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

    private void readFromParcel(Parcel in) {
        mId = in.readInt();
        mNo = in.readInt();
        mName = in.readString();
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(mId);
        dest.writeInt(mNo);
    }

    private Station(Parcel in) {
        readFromParcel(in);
    }

    public static final Parcelable.Creator<Station> CREATOR = new Parcelable.Creator<Station>() {

        @Override
        public Station createFromParcel(Parcel source) {
            return new Station(source);
        }

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

}

Station.java

{{1}}

使用自定义对象捆绑HashMap

0 个答案: