java – 自定义对象是通过值传递的还是通过引用在片段和活动中传

我有一个名为Room_Structure的类,它实现了Serializable.这个类有一个名为currentRoom的对象.

如果我将两个片段之间的对象放在两个片段之间,将其放在一个bundle中,它的工作正常,令人惊讶的是它被引用传递.我不知道为什么会这样.它不应该这样做. btw我正在使用Android支持库？

但是,如果我正在使用一个捆绑包将活动之间的currentRoom对象传递给一个意图,那么当我尝试使用该意图开始一个新的活动时,我会遇到崩溃.

更多说明这是代码

public class Room_Structure implements Serializable {


    private static final long serialVersionUID = 1L;
    private String Rname;
    private ArrayList<Message_Pattern> msg_list;
    private MultiUserChat XmppSession;
    private boolean Background;
    private boolean Modified;
    private boolean Destroyed;
}

上面的类有构造函数,以及getter和setter.

现在这是我在做什么：

考虑一下currentRoom对象已经被填充了,这里是我如何将它传递给Fragment

Bundle b = new Bundle();
    b.putSerializable("RoomObject",currentRoom);
    Fragment_Chat newChat = new Fragment_Chat();
    newChat.setArguments(b);
    FragmentManager fm = getChildFragmentManager();
    FragmentTransaction ft = fm.beginTransaction();
    ft.replace(R.id.fl_chatFragment,newChat);
    ft.addToBackStack(null);
    ft.commit();

从Fragment_Chat OnActivityCreated()方法中检索它

Bundle extras = getArguments();
Room_Structure recievedRoom = (Room_Structure) extras.getSerializable("RoomObject");

现在这个上面的代码正在为片段工作.唯一的问题是将对象的引用传递给新的片段.哪个不是应该真正的行为.它应该只是发送值不参考.

这是我如何知道对象通过引用传递

Sending Object : com.software.chat.Classes.Room_Structure@425585e8
Recieved Object: com.software.chat.Classes.Room_Structure@425585e8

都有相同的参考或地址.在调试过程中检查出来

现在我不能在活动中复制这个行为

我有一个Activity,其中包含一个ExpandibleListView.我已经通过从BaseExpandableListAdapter扩展该扩展名列表实现了适配器.此适配器类名称为Websites_ListAdapter.java.它也在其构造函数中传递了活动的上下文.
我已经在列表中点击了布局.而当我点击时我想开始一个活动.请不要问为什么我这样做是一个漫长的故事.
我正在从这个Websites_ListAdapter发送这个对象

Intent i=new Intent(ActivityContext,ChatScreen.class);
    Bundle b = new Bundle();
    b.putSerializable("RoomObject",currentRoom);
    i.putExtras(b);
    i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    ActivityContext.startActivity(i);

但是我在Logcat中收到这个错误这一次当我调用ActivityContext.startActivity(i)

04-25 15:38:07.474: E/AndroidRuntime(10250): FATAL EXCEPTION: main
04-25 15:38:07.474: E/AndroidRuntime(10250): java.lang.RuntimeException: Parcelable encountered IOException writing 

serializable object (name = com.software.chat.Classes.Room_Structure)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.os.Parcel.writeSerializable(Parcel.java:1279)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.os.Parcel.writeValue(Parcel.java:1233)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.os.Parcel.writeMapInternal(Parcel.java:591)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.os.Bundle.writeToParcel(Bundle.java:1619)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.os.Parcel.writeBundle(Parcel.java:605)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.content.Intent.writeToParcel(Intent.java:6814)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.app.ActivityManagerProxy.startActivity

(ActivityManagerNative.java:1910)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.app.Instrumentation.execStartActivity(Instrumentation.java:1415)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.app.Activity.startActivityForResult(Activity.java:3446)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.app.Activity.startActivityForResult(Activity.java:3407)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.support.v4.app.FragmentActivity.startActivityForResult

(FragmentActivity.java:817)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.app.Activity.startActivity(Activity.java:3617)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.app.Activity.startActivity(Activity.java:3585)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at com.software.chat.Adapters.Websites_ListAdapter$1.onClick

(Websites_ListAdapter.java:211)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.view.View.performClick(View.java:4211)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.view.View$PerformClick.run(View.java:17267)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.os.Handler.handleCallback(Handler.java:615)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.os.Handler.dispatchMessage(Handler.java:92)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.os.Looper.loop(Looper.java:137)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.app.ActivityThread.main(ActivityThread.java:4898)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at java.lang.reflect.Method.invokeNative(Native Method)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at java.lang.reflect.Method.invoke(Method.java:511)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run

(ZygoteInit.java:1006)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at dalvik.system.NativeStart.main(Native Method)
04-25 15:38:07.474: E/AndroidRuntime(10250): Caused by: java.io.NotSerializableException: 

org.jivesoftware.smackx.muc.MultiUserChat
04-25 15:38:07.474: E/AndroidRuntime(10250):    at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1364)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at java.io.ObjectOutputStream.writeObjectInternal

(ObjectOutputStream.java:1671)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at java.io.ObjectOutputStream.defaultWriteObject

(ObjectOutputStream.java:368)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at java.io.ObjectOutputStream.writeObjectInternal

(ObjectOutputStream.java:1671)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481)
04-25 15:38:07.474: E/AndroidRuntime(10250):    at android.os.Parcel.writeSerializable(Parcel.java:1274)
04-25 15:38:07.474: E/AndroidRuntime(10250):    ... 24 more

我知道有很多方法可以在活动之间传递对象,但我想知道为什么会这样发生,什么是可序列化在后台执行？

任何关于此事的帮助都非常感激.