java可序列化和接口:Parcelable在写入可序列化对象时遇到IOException
我在stackoverflow上读过与此主题相关的各种线程,但似乎没有一个线程能够解决我遇到的这个特定问题
我使用以下对象作为接口:
public class FailGroupCreateEvent implements Serializable {
private OnEventListener mOnEventListener;
public void setOnEventListener(OnEventListener listener) {
mOnEventListener = listener;
}
public void doEvent() {
if (mOnEventListener != null) {
mOnEventListener.onEvent(); // event object :)
}
}
public interface OnEventListener extends Serializable {
void onEvent();
}
}
这样,如果一个组无法创建Activity B
,它将通知Activity A
,并且Activity A
将加载一个snackbar以显示失败消息
在Activity A
中,我执行以下操作:
FailGroupCreateEvent failGroupCreateEvent = new FailGroupCreateEvent();
FailGroupCreateEvent.OnEventListener failedToCreateGroup = new FailGroupCreateEvent.OnEventListener() {
@Override
public void onEvent() {
Snackbar.make(getView(), getString(R.string.failed_group_create), Snackbar.LENGTH_LONG).show();
}
};
failGroupCreateEvent.setOnEventListener(failedToCreateGroup);
然后,我使用以下代码启动Activity B
,并将额外的代码放入intent中:
Intent intent = new Intent(context, ActivityB.class);
intent.putExtra(context.getString(R.string.failed_intent), failGroupCreateEvent);
startActivity(intent);
在ActivityB
中,我执行以下操作:
FailGroupCreateEvent failGroupCreateEvent;
if (//there is some type of network error) {
failGroupCreateEvent.doEvent();
}
但是,FailGroupCreateEvent对象引发以下错误:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.myapp, PID: 4720
java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = com.myapp.interfaces.FailGroupCreateEvent)
at 安卓.os.Parcel.writeSerializable(Parcel.java:1394)
at 安卓.os.Parcel.writeValue(Parcel.java:1341)
at 安卓.os.Parcel.writeArrayMapInternal(Parcel.java:644)
at 安卓.os.BaseBundle.writeToParcelInner(BaseBundle.java:1313)
at 安卓.os.Bundle.writeToParcel(Bundle.java:1034)
at 安卓.os.Parcel.writeBundle(Parcel.java:669)
at 安卓.content.Intent.writeToParcel(Intent.java:7485)
at 安卓.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:2411)
at 安卓.app.Instrumentation.execStartActivity(Instrumentation.java:1496)
at 安卓.app.Activity.startActivityForResult(Activity.java:3745)
at 安卓.app.Activity.startActivityForResult(Activity.java:3706)
at 安卓.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:843)
at 安卓.app.Activity.startActivity(Activity.java:4016)
at 安卓.app.Activity.startActivity(Activity.java:3984)
at com.adapter.InnerPlaceAdapter$1.onClick(InnerPlaceAdapter.java:282)
at 安卓.view.View.performClick(View.java:4780)
at 安卓.view.View$PerformClick.run(View.java:19866)
at 安卓.os.Handler.handleCallback(Handler.java:739)
at 安卓.os.Handler.dispatchMessage(Handler.java:95)
at 安卓.os.Looper.loop(Looper.java:135)
at 安卓.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.io.NotSerializableException: com.myapp.activities.PlacesFragment
at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1344)
at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1651)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1497)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1461)
at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:959)
at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:360)
at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1054)
at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1384)
at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1651)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1497)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1461)
at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:959)
at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:360)
at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1054)
at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1384)
at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1651)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1497)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1461)
at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:959)
at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:360)
at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1054)
at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1384)
at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1651)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1497)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1461)
at 安卓.os.Parcel.writeSerializable(Parcel.java:1389)
at 安卓.os.Parcel.writeValue(Parcel.java:1341)
at 安卓.os.Parcel.writeArrayMapInternal(Parcel.java:644)
at 安卓.os.BaseBundle.writeToParcelInner(BaseBundle.java:1313)
at 安卓.os.Bundle.writeToParcel(Bundle.java:1034)
at 安卓.os.Parcel.writeBundle(Parcel.java:669)
at 安卓.content.Intent.writeToParcel(Intent.java:7485)
at 安卓.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:2411)
at 安卓.app.Instrumentation.execStartActivity(Instrumentation.java:1496)
at 安卓.app.Activity.startActivityForResult(Activity.java:3745)
at 安卓.app.Activity.startActivityForResult(Activity.java:3706)
at 安卓.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:843)
at 安卓.app.Activity.startActivity(Activity.java:4016)
at 安卓.app.Activity.startActivity(Activity.java:3984)
at com.adapter.InnerPlaceAdapter$1.onClick(InnerPlaceAdapter.java:282)
at 安卓.view.View.performClick(View.java:4780)
at 安卓.view.View$PerformClick.run(View.java:19866)
at 安卓.os.Handler.handleCallback(Handler.java:739)
at 安卓.os.Handler.dispatchMessage(Handler.java:95)
at 安卓.os.Looper.loop(Looper.java:135)
at 安卓.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:698)
为什么我不能将其作为可序列化对象在两个活动之间传递
# 1 楼答案
从战术上讲,您正试图通过
Serializable
传递活动本身以及它所持有的所有内容,这是getView()
之类的东西的帮助从战略上讲,你想要的东西是行不通的
Serializable
用于将内容写入文件。文件不能包含活动、或View
或事件侦听器。现在,Android恰好提供了Serializable
对Intent
额外功能的支持,但这并没有改变Serializable
的基本性质。如果无法写入文件,则无法工作。在最好的情况下,接收者将得到对象的副本,而这些副本不会绑定到发送者根据这里发生的情况,您需要:
使用
startActivityForResult()
和onActivityResult()
,或使用事件总线,或
如果这两个活动紧密耦合(例如,使用片段),请不要将它们组合成一个单独的活动。