如何使用ArrayList <Parcelable>正确实现Parcelable？

Question

我上课时遇到了麻烦Parcelable.麻烦的是,我正在尝试写一个包中的一个成员作为一个ArrayList<Parcelable>对象.的ArrayList是Serializable,和对象(ZigBeeDev)在列表中的Parcelable.

这是相关代码:

package com.gnychis.coexisyst;

import java.util.ArrayList;
import java.util.Iterator;

import android.os.Parcel;
import android.os.Parcelable;

public class ZigBeeNetwork implements Parcelable {

    public String _mac;             // the source address (of the coordinator?)
    public String _pan;             // the network address
    public int _band;               // the channel
    ArrayList<Integer> _lqis;       // link quality indicators (to all devices?)
    ArrayList<ZigBeeDev> _devices;  // the devices in the network

    public void writeToParcel(Parcel out, int flags) {
        out.writeString(_mac);
        out.writeString(_pan);
        out.writeInt(_band);
        out.writeSerializable(_lqis);
        out.writeParcelable(_devices, 0);  // help here
    }

    private ZigBeeNetwork(Parcel in) {
        _mac = in.readString();
        _pan = in.readString();
        _band = in.readInt();
        _lqis = (ArrayList<Integer>) in.readSerializable();
        _devices = in.readParcelable(ZigBeeDev.class.getClassLoader());  // help here
    }

    public int describeContents() {
        return this.hashCode();
    }

    public static final Parcelable.Creator<ZigBeeNetwork> CREATOR = 
            new Parcelable.Creator<ZigBeeNetwork>() {
        public ZigBeeNetwork createFromParcel(Parcel in) {
            return new ZigBeeNetwork(in);
        }

        public ZigBeeNetwork[] newArray(int size) {
            return new ZigBeeNetwork[size];
        }
    };

    //...
}

我已经标记了两个"// help here",以了解如何正确地写入包裹以及如何重建它.如果ZigBeeDev是Parcelable(很好的测试),我怎么做这正常吗？

Answer 1

你几乎得到了它!

你只需要这样做:

public void writeToParcel(Parcel out, int flags) {
    out.writeString(_mac);
    out.writeString(_pan);
    out.writeInt(_band);
    out.writeSerializable(_lqis);
    out.writeTypedList(_devices);
}

private ZigBeeNetwork(Parcel in) {
    _mac = in.readString();
    _pan = in.readString();
    _band = in.readInt();
    _lqis = (ArrayList<Integer>) in.readSerializable();
    in.readTypedList(_devices, ZigBeeDev.CREATOR);
}

就这样!

对于您的Integer列表,您还可以:

out.writeList(_lqis);
_lqis = new ArrayList<>();
in.readList(_lqis Integer.class.getClassLoader());

它应该工作.

Answer 2

在我的情况in.readTypedList(_devices, ZigBeeDev.CREATOR);给我一个NullPointerException上_devices.所以我用过这个:

_devices = in.createTypedArrayList(ZigBeeDev.CREATOR);

Answer 3

您应该使用writeList(List l)作为整数列表,使用writeTypedList(List val)作为ZigBeeDevices列表