在kotlin中，如何从Parcelable父级(并实现了嵌套的Builder类)生成派生类

Question

有了一个使用Builder模式的基类(它是可Parceable的)，现在想创建一个派生自它的子类，以便覆盖默认的customFunc_1和customFunc_2函数实现。

如果只是从基类派生，

class DerivedDataConfig : BaseDataConfig {
override open fun customFunc_1(context: Context, savedInstanceState: Bundle?,
onElementClickListener: ElementClickListener? = null) : FrameLayout? {
// differnt than base
Log.i("+++", "+++, customFunc_1 called in derived class")
return android.widget.FrameLayout(context)
}
override fun customFunc_2(viewToBind: View, content: IData, position: Int) {
Log.i("+++", "+++, customFunc_2 called in derived class")
}
}  

放入包裹并从包裹中获取包裹后，

bundle.putParcelable(KEY_DATA_CONFIG, derivedDataConfig)
var derivedDataConfig.getParcelable(KEY_DATA_CONFIG)

它返回基类(丢失了派生类的重写函数实现)

如何在kotlin中从Praceable的基类派生

如果没有办法重用基类的构建器，这是可以的，但从可Parcelable的父类派生似乎有问题。

有人知道怎么做吗？

open class BaseDataConfig() : Parcelable {
var param_1 = false
var param_2 = ArrayList<DataDescriptor>()
private constructor(parcel: Parcel) : this() {
param_1 = parcel.readByte() != 0.toByte()
parcel.readList(param_1, DataDescriptor::class.java.classLoader)
}
open fun customFunc_1(context: Context, savedInstanceState: Bundle?,
onElementClickListener: ElementClickListener? = null) : FrameLayout? {
return null
}
open fun customFunc_2(viewToBind: View, content: IData, position: Int) {
}
class Builder {
private var param_1 = false
private var param_2 = ArrayList<DataDescriptor>()
fun setParam_1(b: Boolean) = apply { this.param_1 = b }
fun setParam_2(type: String, id: Int) = apply { this.param_2.add(DataDescriptor(type, id)) }
fun build() : DataConfig {
return DataConfig().also {
it.param_1 = param_1
it.param_1_2 = param_2
}
}
}
override fun writeToParcel(dest: Parcel, flags: Int) {
dest.writeByte(if (param_1) 1 else 0)
dest.writeList(param_2)
}
override fun describeContents(): Int {
return 0
}
companion object {
@JvmField
val CREATOR: Parcelable.Creator<DataConfig> = object : Parcelable.Creator<DataConfig> {
override fun createFromParcel(parcel: Parcel): DataConfig {
return DataConfig(parcel)
}
override fun newArray(size: Int): Array<DataConfig?> {
return arrayOfNulls(size)
}
}
}
}
class DataDescriptor(val type: String, val id: Int)

Answer 1

在此处查找从Parcelable父类派生的解决方案复制此处以供参考：

class SavedState extends BaseSavedState {
int stateToSave;
SavedState(Parcelable superState) {
super(superState);
}
private SavedState(Parcel in) {
super(in);
this.stateToSave = in.readInt();
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeInt(this.stateToSave);
}
//required field that makes Parcelables from a Parcel
public static final Parcelable.Creator<SavedState> CREATOR =
new Parcelable.Creator<SavedState>() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}

我想对于Builder来说，它可能必须在派生类中添加一个嵌套的Builder类。或者有谁有更好的办法？