序列化parcelable问题:RuntimeException的:Parcelable遇到IOException异常写入序列化对象 [英] Serializable parcelable issue: RuntimeException: Parcelable encountered IOException writing serializable object
问题描述
伙计们,我有最简单的,我想成为Parcelable类。我做它在下列方式:
公共类MyField的实现Serializable,Parcelable
{ 公共MyField的()
{
}
// ************
// Parcelable方法
// ************
公众诠释describeContents(){返回0; }; 公共无效writeToParcel(包裹出来,诠释标志)
{
out.writeInt(this.describeContents());
out.writeSerializable(本);
} @燮pressWarnings(多余)
公共Parcelable.Creator<&MyField的GT; CREATOR
=新Parcelable.Creator<&MyField的GT;()
{
公共MyField的createFromParcel(包裹中)
{
int描述= in.readInt();
Serializable接口S = in.readSerializable();
开关(介绍)
{
情况下0:
返回(MyField的)S;
默认:
返回null;
}
} 公共MyField的[] newArray(INT大小)
{
返回新MyField的【尺寸】;
}
};
}
简单,嘿?是的,看起来像。但是,当我尝试我的类对象发送到另一个活动像包裹对象:
=意图意图新(活动,SendMessageActivity.class);
MyField的FLD =新MyField的();
intent.putExtra(到,(Parcelable)FLD);
activity.startActivity(意向);
我收到以下异常:
了java.lang.RuntimeException:Parcelable遇到IOException异常写入序列化对象(名称= ru.ivanovpv.android.storage.MyField)
在android.os.Parcel.writeSerializable(Parcel.java:1131)
在ru.ivanovpv.android.storage.MyField.writeToParcel(MyField.java:58)
在android.os.Parcel.writeParcelable(Parcel.java:1106)
在android.os.Parcel.writeValue(Parcel.java:1029)
在android.os.Parcel.writeMapInternal(Parcel.java:469)
在android.os.Bundle.writeToParcel(Bundle.java:1445)
在android.os.Parcel.writeBundle(Parcel.java:483)
在android.content.Intent.writeToParcel(Intent.java:5237)
在android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:1204)
在android.app.Instrumentation.execStartActivity(Instrumentation.java:1373)
在android.app.Activity.startActivityForResult(Activity.java:2749)
在android.app.Activity.startActivity(Activity.java:2855)
在ru.ivanovpv.android.storage.BulkContact.doContextItemSelected(BulkContact.java:105)
在ru.ivanovpv.android.cellmessenger.ContactsActivity.onContextItemSelected(ContactsActivity.java:188)
在android.app.Activity.onMenuItemSelected(Activity.java:2174)
在com.android.internal.policy.impl.PhoneWindow$ContextMenuCallback.onMenuItemSelected(PhoneWindow.java:2731)
在com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:139)
在com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:855)
在com.android.internal.view.menu.MenuDialogHelper.onClick(MenuDialogHelper.java:129)
在com.android.internal.app.AlertController $ AlertParams $ 3.onItemClick(AlertController.java:884)
在android.widget.AdapterView.performItemClick(AdapterView.java:284)
在android.widget.ListView.performItemClick(ListView.java:3285)
在android.widget.AbsListView $ PerformClick.run(AbsListView.java:1640)
在android.os.Handler.handleCallback(Handler.java:587)
在android.os.Handler.dispatchMessage(Handler.java:92)
在android.os.Looper.loop(Looper.java:123)
在android.app.ActivityThread.main(ActivityThread.java:4363)
在java.lang.reflect.Method.invokeNative(本机方法)
在java.lang.reflect.Method.invoke(Method.java:521)
在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:860)
在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
在dalvik.system.NativeStart.main(本机方法)
java.io.NotSerializableException:引起ru.ivanovpv.android.storage.MyField $ 1
在java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1547)
在java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1854)
在java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1696)
在java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1660)
在java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:1153)
在java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:420)
在java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1251)
在java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1587)
在java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1854)
在java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1696)
在java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1660)
在android.os.Parcel.writeSerializable(Parcel.java:1126)
... 31更多
不能真正理解什么是这里是不可序列化的?
一切是pretty简单:在Parcelable实行创造者应该是公共静态最后的场 - 不只是公。 p>
通过让创造者现场只是公你让了MyField的类的成员。而作为创造者不是序列化 - 当系统尝试序列化MyField的类的所有成员,使你得到一个崩溃
Folks, I have simplest class which I want to be Parcelable. I'm doing it in following way:
public class MyField implements Serializable, Parcelable
{
public MyField()
{
}
//************************************************
// Parcelable methods
//************************************************
public int describeContents() {return 0; };
public void writeToParcel(Parcel out, int flags)
{
out.writeInt(this.describeContents());
out.writeSerializable(this);
}
@SuppressWarnings("redundant")
public Parcelable.Creator<MyField> CREATOR
= new Parcelable.Creator<MyField>()
{
public MyField createFromParcel(Parcel in)
{
int description=in.readInt();
Serializable s=in.readSerializable();
switch(description)
{
case 0:
return (MyField )s;
default:
return null;
}
}
public MyField[] newArray(int size)
{
return new MyField[size];
}
};
}
Simple, heh? Yes, looks like. But when I try to send my class object to another activity as parcel object like:
intent=new Intent(activity, SendMessageActivity.class);
MyField fld=new MyField();
intent.putExtra("to", (Parcelable )fld);
activity.startActivity(intent);
I'm getting following exception:
java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = ru.ivanovpv.android.storage.MyField)
at android.os.Parcel.writeSerializable(Parcel.java:1131)
at ru.ivanovpv.android.storage.MyField.writeToParcel(MyField.java:58)
at android.os.Parcel.writeParcelable(Parcel.java:1106)
at android.os.Parcel.writeValue(Parcel.java:1029)
at android.os.Parcel.writeMapInternal(Parcel.java:469)
at android.os.Bundle.writeToParcel(Bundle.java:1445)
at android.os.Parcel.writeBundle(Parcel.java:483)
at android.content.Intent.writeToParcel(Intent.java:5237)
at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:1204)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1373)
at android.app.Activity.startActivityForResult(Activity.java:2749)
at android.app.Activity.startActivity(Activity.java:2855)
at ru.ivanovpv.android.storage.BulkContact.doContextItemSelected(BulkContact.java:105)
at ru.ivanovpv.android.cellmessenger.ContactsActivity.onContextItemSelected(ContactsActivity.java:188)
at android.app.Activity.onMenuItemSelected(Activity.java:2174)
at com.android.internal.policy.impl.PhoneWindow$ContextMenuCallback.onMenuItemSelected(PhoneWindow.java:2731)
at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:139)
at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:855)
at com.android.internal.view.menu.MenuDialogHelper.onClick(MenuDialogHelper.java:129)
at com.android.internal.app.AlertController$AlertParams$3.onItemClick(AlertController.java:884)
at android.widget.AdapterView.performItemClick(AdapterView.java:284)
at android.widget.ListView.performItemClick(ListView.java:3285)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:1640)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4363)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.io.NotSerializableException: ru.ivanovpv.android.storage.MyField$1
at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1547)
at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1854)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1696)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1660)
at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:1153)
at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:420)
at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1251)
at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1587)
at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1854)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1696)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1660)
at android.os.Parcel.writeSerializable(Parcel.java:1126)
... 31 more
Can't really understand what's here is unserializable?
Everything is pretty simple: "CREATOR" in the Parcelable implementation should be the "public static final" field - not just "public".
By leaving the "CREATOR" field just "public" you're making it a member of the MyField class. And as "CREATOR" is not "Serializable" - so you're getting a crash while system attempts to serialize all members of the MyField class.
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