我对Serializable和Parcelable很新。我很难将此对象的实例从应用程序传递到远程服务：
public class Event implements Parcelable, Cloneable {
/** Defines under what Bundle's key architecture events are stored */
public static final String BUNDLE_KEY = "ZKEvent";
/** Defines which messages are architecture's events */
public static final int MSG_WHAT = 0xDEFECABE;
/** Defines a key to store map under a Bundle to put into a Parcel (oh yeah!) */
private static final String MAP_KEY = "MAP";
/** Indicates this event ID. This ID should be the same in the event answer if any */
private int idEvent = 0;
/** Indicates this event priority */
private int priority = EventPriority.EVENT_PRIORITY_LOW;
/** ID for this event's sender */
private int idSource = 0;
/** ID for this event's destination */
private int idDestination = 0;
/** Action to be performed */
private int action = EventAction.DEFAULT;
public static final Parcelable.Creator<Event> CREATOR =
new Parcelable.Creator<Event>() {
public Event createFromParcel(Parcel in) {
return new Event(in);
}
public Event[] newArray(int size) {
return new Event[size];
}
};
/**
* Event's data
* Represented as
* key -> parameter;
* value -> data
*/
private Map<String, Object> data = new HashMap<String, Object>();
/** Default constructor */
public Event() {};
/** Contructor with ID of the event */
public Event(int id) {
idEvent = id;
}
/** Constructor for Parcelable */
public Event(Parcel in) {
readFromParcel(in);
}
/** Gets event's priority */
public int getPriority() {
return priority;
}
/** Sets this event's priority */
public void setPriority(int priority) {
this.priority = priority;
}
/** Gets the ID of this event's sender */
public int getIdSource() {
return idSource;
}
/** Sets the ID of this event's sender */
public void setIdSource(int idSource) {
this.idSource = idSource;
}
/** Gets the ID of this event's destination */
public Integer getIdDestination() {
return idDestination;
}
/** Sets the ID of this event's destination */
public void setIdDestination(Integer idDestination) {
this.idDestination = idDestination;
}
/** Gets the action of this event */
public int getAction() {
return action;
}
/** Sets the action of this event */
public void setAction(int action) {
this.action = action;
}
/** Gets the data of this event */
public Object getData(String key) {
return data.get(key);
}
/** Sets the data of this event */
public void addData(String key, Object data) {
this.data.put(key, data);
}
/** Gets the ID of this event */
public int getIdEvent() {
return idEvent;
}
/** Sets the ID of this event */
public void setIdEvent(int idEvent) {
this.idEvent = idEvent;
}
@Override
public Object clone() {
Event clone = new Event();
clone.action = this.action;
clone.idDestination = this.idDestination;
clone.idEvent = this.idEvent;
clone.idSource = this.idSource;
clone.priority = this.priority;
for(Entry<String,Object> entry: this.data.entrySet()) {
clone.data.put(entry.getKey(), entry.getValue());
}
return clone;
}
@Override
public int describeContents() {
// TODO Nothing here
return 0;
}
@Override
public void writeToParcel(Parcel out, int flags) {
out.writeInt(idEvent);
out.writeInt(priority);
out.writeInt(idSource);
out.writeInt(idDestination);
out.writeInt(action);
Bundle mapBundle = new Bundle();
mapBundle.putSerializable(MAP_KEY, (Serializable) data);
out.writeBundle(mapBundle);
}
/** Restoring this object from a Parcel */
public void readFromParcel(Parcel in) {
idEvent = in.readInt();
priority = in.readInt();
idSource = in.readInt();
idDestination = in.readInt();
action = in.readInt();
Bundle mapBundle = in.readBundle();
data = (Map<String, Object>) mapBundle.getSerializable(MAP_KEY);
}
}
所以我创建了这个Event类的新实例，并将其传递给服务，如下所示：
/** Register with service */
private void registerWithService() {
Event registerEvent = EventFactory.getEvent();
registerEvent.setAction(EventAction.REGISTER);
registerEvent.setIdSource(1);
Bundle data = new Bundle();
data.putParcelable(Event.BUNDLE_KEY, registerEvent);
Message msg = new Message();
msg.setData(data); // Exception thrown here in the Service
msg.what = Event.MSG_WHAT;
try {
outMessenger.send(msg);
} catch (RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
在远程服务中抛出异常的位置：
public void handleMessage(Message msg) {
if (msg.what == Event.MSG_WHAT) {
// Get the data bundle
Bundle bundle = msg.getData();
// Extract the event from the message
Event event = (Event) bundle.get(Event.BUNDLE_KEY); // Exception thrown here
sendEvent(event);
} else {
Log.i(TAG, "Received non architecture message, dropping...");
}
}
堆栈跟踪：
07-09 12:38:10.947: E/AndroidRuntime(2234): FATAL EXCEPTION: main
07-09 12:38:10.947: E/AndroidRuntime(2234): android.os.BadParcelableException: ClassNotFoundException when unmarshalling: com.blabla.android.core.event.Event
07-09 12:38:10.947: E/AndroidRuntime(2234): at android.os.Parcel.readParcelable(Parcel.java:1958)
07-09 12:38:10.947: E/AndroidRuntime(2234): at android.os.Parcel.readValue(Parcel.java:1846)
07-09 12:38:10.947: E/AndroidRuntime(2234): at android.os.Parcel.readMapInternal(Parcel.java:2083)
07-09 12:38:10.947: E/AndroidRuntime(2234): at android.os.Bundle.unparcel(Bundle.java:208)
07-09 12:38:10.947: E/AndroidRuntime(2234): at android.os.Bundle.get(Bundle.java:260)
07-09 12:38:10.947: E/AndroidRuntime(2234): at com.blabla.android.core.event.EventManager$EventHandler.handleMessage(EventManager.java:44)
07-09 12:38:10.947: E/AndroidRuntime(2234): at android.os.Handler.dispatchMessage(Handler.java:99)
07-09 12:38:10.947: E/AndroidRuntime(2234): at android.os.Looper.loop(Looper.java:123)
07-09 12:38:10.947: E/AndroidRuntime(2234): at android.app.ActivityThread.main(ActivityThread.java:3683)
07-09 12:38:10.947: E/AndroidRuntime(2234): at java.lang.reflect.Method.invokeNative(Native Method)
07-09 12:38:10.947: E/AndroidRuntime(2234): at java.lang.reflect.Method.invoke(Method.java:507)
07-09 12:38:10.947: E/AndroidRuntime(2234): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
07-09 12:38:10.947: E/AndroidRuntime(2234): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
07-09 12:38:10.947: E/AndroidRuntime(2234): at dalvik.system.NativeStart.main(Native Method)
非常感谢任何帮助，谢谢！
答案 0 :(得分：14)
在此方法中，您永远不会将Bundle写入包：
public void writeToParcel(Parcel out, int flags) {
out.writeInt(idEvent);
out.writeInt(priority);
out.writeInt(idSource);
out.writeInt(idDestination);
out.writeInt(action);
Bundle mapBundle = new Bundle();
mapBundle.putSerializable(MAP_KEY, (Serializable) data);
// You need to actually write the Bundle to the Parcel here...
}
编辑为ClassLoader问题添加了其他解决方案：
在远程服务的handleMessage()中设置类加载器，如下所示：
Bundle bundle = msg.getData();
bundle.setClassLoader(Event.class.getClassLoader());
Event event = (Event) bundle.get(Event.BUNDLE_KEY);