java - 在 Intent 之间发送自定义模型列表

Question

我在 SO 上找到了很多答案，但没有一个对我有用。我有一个 List<MyModel> myList我想通过 Intents 传递和检索。
MyModel 实现了 Parcelable 及其实现。
我正在使用 intent.putExtra("my_key",(Parcelable) myList);
运行时抛出异常

java.util.ArrayList cannot be cast to android.os.Parcelable

如果我使用 putParcelableArrayListExtra然后它说第二个参数类型错误。
任何解释或其他方式都会有帮助
编辑:我的模型类是:

public class Filter {

    private String categoryId;

    public List<PrimaryFilterData> getPrimaryFilterDataList() {
        return primaryFilterDataList;
    }

    public void setPrimaryFilterDataList(List<PrimaryFilterData> primaryFilterDataList) {
        this.primaryFilterDataList = primaryFilterDataList;
    }

    public String getCategoryName() {
        return categoryName;
    }

    public void setCategoryName(String categoryName) {
        this.categoryName = categoryName;
    }

    public String getCategoryId() {
        return categoryId;
    }

    public void setCategoryId(String categoryId) {
        this.categoryId = categoryId;
    }

    private String categoryName;

    private List<PrimaryFilterData> primaryFilterDataList;


    public static class PrimaryFilterData implements Parcelable
    {
        private String filterId;

        protected PrimaryFilterData(Parcel in) {
            filterId = in.readString();
            filterName = in.readString();
        }

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

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

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

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

        public String getFilterName() {
            return filterName;
        }

        public void setFilterName(String filterName) {
            this.filterName = filterName;
        }

        public String getFilterId() {
            return filterId;
        }

        public void setFilterId(String filterId) {
            this.filterId = filterId;
        }

        public List<SecondaryFilterData> getSecondaryFilterDataList() {
            return secondaryFilterDataList;
        }

        public void setSecondaryFilterDataList(List<SecondaryFilterData> secondaryFilterDataList) {
            this.secondaryFilterDataList = secondaryFilterDataList;
        }

        private String filterName;

        private List<SecondaryFilterData> secondaryFilterDataList;

    }

    public static class SecondaryFilterData implements Parcelable {
        private String secFilterName;
        private String secFilterId;
        private boolean isChecked=false;

        public SecondaryFilterData(){}

        protected SecondaryFilterData(Parcel in) {
            secFilterName = in.readString();
            secFilterId = in.readString();
            isChecked = in.readByte() != 0;
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            dest.writeString(secFilterName);
            dest.writeString(secFilterId);
            dest.writeByte((byte) (isChecked ? 1 : 0));
        }

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

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

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

        public boolean isChecked() {
            return isChecked;
        }

        public void setIsChecked(boolean isChecked) {
            this.isChecked = isChecked;
        }

        public String getSecFilterName() {
            return secFilterName;
        }

        public void setSecFilterName(String secFilterName) {
            this.secFilterName = secFilterName;
        }

        public String getSecFilterId() {
            return secFilterId;
        }

        public void setSecFilterId(String secFilterId) {
            this.secFilterId = secFilterId;
        }
    }
}

现在我希望将一个 Activity 的主要数据列表发送给其他 Activity

Answer 1

您可以使用 Bundle 实现这一点。

// Important - use array list not regular list.
// MyModel must implement Parcelable
ArrayList<MyModel> myList;

Bundle bundle = new Bundle();
bundle.putParcelableArrayList("my_key", myList);
intent.putExtras(bundle);

如果您的列表必须是 List 类型，您可以在最后一刻转换它。

bundle.putParcelableArrayList("my_key", new ArrayList<MyModel>(myList));

然后在接收 Activity 中。

List<MyModel> myList = getIntent().getParcelableArrayListExtra("my_key");