使用Parcelable传递Arraylist<CustomObject>，传递null

@Override
public void writeToParcel(Parcel dest, int flags) {
    if (customObject == null) {
        dest.writeInt(0); // 写入一个特殊标志，表示对象为null
    } else {
        dest.writeInt(1); // 写入一个标志，表示对象不为null
        dest.writeParcelable(customObject, flags);
    }
}

private CustomObject(Parcel in) {
    if (in.readInt() == 1) {
        customObject = in.readParcelable(CustomObject.class.getClassLoader());
    } else {
        customObject = null;
    }
}

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

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

Intent intent = new Intent();
intent.putParcelableArrayListExtra("customObjects", customObjectList);

ArrayList<CustomObject> customObjectList = getIntent().getParcelableArrayListExtra("customObjects");