Android使用包含另一个hashmap的hashmap实现Parcelable对象

public class MyParcelable implements Parcelable {
    private HashMap<String, HashMap<String, String>> data;

    public MyParcelable(HashMap<String, HashMap<String, String>> data) {
        this.data = data;
    }

    protected MyParcelable(Parcel in) {
        // 从Parcel中读取数据并构建HashMap
        int size = in.readInt();
        data = new HashMap<>();
        for (int i = 0; i < size; i++) {
            String key = in.readString();
            HashMap<String, String> innerMap = new HashMap<>();
            int innerSize = in.readInt();
            for (int j = 0; j < innerSize; j++) {
                String innerKey = in.readString();
                String innerValue = in.readString();
                innerMap.put(innerKey, innerValue);
            }
            data.put(key, innerMap);
        }
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        // 将HashMap写入Parcel
        dest.writeInt(data.size());
        for (Map.Entry<String, HashMap<String, String>> entry : data.entrySet()) {
            dest.writeString(entry.getKey());
            HashMap<String, String> innerMap = entry.getValue();
            dest.writeInt(innerMap.size());
            for (Map.Entry<String, String> innerEntry : innerMap.entrySet()) {
                dest.writeString(innerEntry.getKey());
                dest.writeString(innerEntry.getValue());
            }
        }
    }

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

    public static final Creator<MyParcelable> CREATOR = new Creator<MyParcelable>() {
        @Override
        public MyParcelable createFromParcel(Parcel in) {
            return new MyParcelable(in);
        }

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

HashMap<String, HashMap<String, String>> outerMap = new HashMap<>();
HashMap<String, String> innerMap = new HashMap<>();
innerMap.put("key1", "value1");
innerMap.put("key2", "value2");
outerMap.put("outerKey", innerMap);

MyParcelable myParcelable = new MyParcelable(outerMap);

Intent intent = new Intent(this, AnotherActivity.class);
intent.putExtra("myParcelable", myParcelable);
startActivity(intent);

MyParcelable myParcelable = getIntent().getParcelableExtra("myParcelable");
HashMap<String, HashMap<String, String>> data = myParcelable.getData();

// 使用数据
HashMap<String, String> innerMap = data.get("outerKey");
String value = innerMap.get("key1");