我正在使用Parcelable在片段之间进行通信。一切都运行良好,但有时当Android杀死应用程序进程以释放内存并且用户返回应用程序时,Parcelable从数组中获取大量项目,例如数百万项而不是2-3项,当然它会抛出OOM。 我想CREATOR有些不对劲,但是我无法处理它。 parcelable的代码由超类和子类以及我感兴趣的项类组成:
基类:
public abstract class BaseRs implements Parcelable {
private String token;
private String msgAlert;
private String simpleMsg;
private AdsObj adsObj;
private Map<String, String> mapSettings;
//getters & setters
public BaseRs() {
}
protected BaseRs(Parcel in) {
token = in.readString();
msgAlert = in.readString();
simpleMsg = in.readString();
adsObj = in.readParcelable(AdsObj.class.getClassLoader());
mapSettings = MapParcelable.readParcelable(in);
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(token);
dest.writeString(msgAlert);
dest.writeString(simpleMsg);
dest.writeParcelable(adsObj, flags);
MapParcelable.writeToParcel(dest, mapSettings);
}
}
儿童班
public class GetSalesItemsRs extends BaseRs {
private SaleCoinItem[] coinPacksArray;
//getters+ setters
protected GetSalesItemsRs(Parcel in) {
super(in);
coinPacksArray = in.createTypedArray(SaleCoinItem.CREATOR);
}
@Override
public void writeToParcel(Parcel dest, int flags) {
super.writeToParcel(dest, flags);
dest.writeTypedArray(coinPacksArray, flags);
}
@Override
public int describeContents() {
return 0;
}
public static final Creator<GetSalesItemsRs> CREATOR = new Creator<GetSalesItemsRs>() {
@Override
public GetSalesItemsRs createFromParcel(Parcel in) {
return new GetSalesItemsRs(in);
}
@Override
public GetSalesItemsRs[] newArray(int size) {
return new GetSalesItemsRs[size];
}
};
}
和我感兴趣的对象
public class SaleCoinItem implements Parcelable {
private int amount;
private double price;
private int sortOrder;
//getters & setters
protected SaleCoinItem(Parcel in) {
amount = in.readInt();
price = in.readDouble();
sortOrder = in.readInt();
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(amount);
dest.writeDouble(price);
dest.writeInt(sortOrder);
}
@Override
public int describeContents() {
return 0;
}
public static final Creator<SaleCoinItem> CREATOR = new Creator<SaleCoinItem>() {
@Override
public SaleCoinItem createFromParcel(Parcel in) {
return new SaleCoinItem(in);
}
@Override
public SaleCoinItem[] newArray(int size) {
return new SaleCoinItem[size];
}
};
}
包裹地图的功能 - 可能在这里是错误;)
public class MapParcelable {
public static void writeToParcel(Parcel out, Map<String, String> map) {
if (map != null) {
out.writeInt(map.size());
for (Map.Entry<String, String> entry : map.entrySet()) {
out.writeString(entry.getKey());
out.writeString(entry.getValue());
}
}
}
public static Map<String, String> readParcelable(Parcel parcel) {
Map<String, String> map = new HashMap<String, String>();
int size = parcel.readInt();
for (int i = 0; i < size; i++) {
String key = parcel.readString();
String value = parcel.readString();
map.put(key, value);
}
return map;
}
}
我在onCreateView
方法中获得了parcelable obj:
GetSalesItemsRs mGetSalesItemsRs = getArguments().getParcelable(KEY_PARCEL);
答案 0 :(得分:1)
我认为问题在于,如果Map为null,则不会将大小字段写入Parcel,但是当您读取它时,您总是会读取size字段,并且最终可能会读取一些随机值。所以或者你将代码更改为
if (map != null) {
out.writeInt(map.size());
for (Map.Entry<String, String> entry : map.entrySet()) {
out.writeString(entry.getKey());
out.writeString(entry.getValue());
}
}else{
out.writeInt(0);
}
并且在重新创建类时永远不会获得空值,或者您创建另一个布尔字段&#34; hasMap&#34;并且总是写一个