Serializable和interfaces:Parcelable遇到IOException,编写可序列化对象

时间:2016-03-17 17:46:12

标签: java android serialization interface

我已经在stackoverflow上阅读了与此主题相关的各种线程,但似乎没有解决我遇到的这个特殊问题。

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();
    }

}

它就是这样,如果一个组无法创建Activity B,它将通知Activity AActivity A将加载一个快餐栏以显示失败消息。

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并将额外内容放入intent:

                Intent intent = new Intent(context, ActivityB.class);
                intent.putExtra(context.getString(R.string.failed_intent), failGroupCreateEvent);
                startActivity(intent);

ActivityB中,我执行以下操作:

FailGroupCreateEvent failGroupCreateEvent;
if (//there is some type of network error) {
      failGroupCreateEvent.doEvent();
}

但是,FailGroupCreateEvent对象抛出此错误:

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 android.os.Parcel.writeSerializable(Parcel.java:1394)
                                                     at android.os.Parcel.writeValue(Parcel.java:1341)
                                                     at android.os.Parcel.writeArrayMapInternal(Parcel.java:644)
                                                     at android.os.BaseBundle.writeToParcelInner(BaseBundle.java:1313)
                                                     at android.os.Bundle.writeToParcel(Bundle.java:1034)
                                                     at android.os.Parcel.writeBundle(Parcel.java:669)
                                                     at android.content.Intent.writeToParcel(Intent.java:7485)
                                                     at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:2411)
                                                     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1496)
                                                     at android.app.Activity.startActivityForResult(Activity.java:3745)
                                                     at android.app.Activity.startActivityForResult(Activity.java:3706)
                                                     at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:843)
                                                     at android.app.Activity.startActivity(Activity.java:4016)
                                                     at android.app.Activity.startActivity(Activity.java:3984)
                                                     at com.adapter.InnerPlaceAdapter$1.onClick(InnerPlaceAdapter.java:282)
                                                     at android.view.View.performClick(View.java:4780)
                                                     at android.view.View$PerformClick.run(View.java:19866)
                                                     at android.os.Handler.handleCallback(Handler.java:739)
                                                     at android.os.Handler.dispatchMessage(Handler.java:95)
                                                     at android.os.Looper.loop(Looper.java:135)
                                                     at android.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.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
                                                     at com.android.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 android.os.Parcel.writeSerializable(Parcel.java:1389)
                                                     at android.os.Parcel.writeValue(Parcel.java:1341) 
                                                     at android.os.Parcel.writeArrayMapInternal(Parcel.java:644) 
                                                     at android.os.BaseBundle.writeToParcelInner(BaseBundle.java:1313) 
                                                     at android.os.Bundle.writeToParcel(Bundle.java:1034) 
                                                     at android.os.Parcel.writeBundle(Parcel.java:669) 
                                                     at android.content.Intent.writeToParcel(Intent.java:7485) 
                                                     at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:2411) 
                                                     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1496) 
                                                     at android.app.Activity.startActivityForResult(Activity.java:3745) 
                                                     at android.app.Activity.startActivityForResult(Activity.java:3706) 
                                                     at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:843) 
                                                     at android.app.Activity.startActivity(Activity.java:4016) 
                                                     at android.app.Activity.startActivity(Activity.java:3984) 
                                                     at com.adapter.InnerPlaceAdapter$1.onClick(InnerPlaceAdapter.java:282) 
                                                     at android.view.View.performClick(View.java:4780) 
                                                     at android.view.View$PerformClick.run(View.java:19866) 
                                                     at android.os.Handler.handleCallback(Handler.java:739) 
                                                     at android.os.Handler.dispatchMessage(Handler.java:95) 
                                                     at android.os.Looper.loop(Looper.java:135) 
                                                     at android.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.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
                                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 

为什么我不能将它作为两个活动之间的可序列化对象传递?

1 个答案:

答案 0 :(得分:3)

从战术上讲,您试图通过Serializable传递活动本身以及它所持有的所有内容,但getView()提供了这些内容。

战略上,你想要的东西不起作用。 Serializable用于将文件写入文件。文件无法保存活动,View或事件侦听器。现在,Android恰好为Serializable个额外内容提供了Intent支持,但这并没有改变Serializable的基本性质。如果无法将其写入文件,则无法正常工作。在最好的情况下,收件人最终会收到对象的副本,并且他们不会被绑定到发件人。

根据此处的情况,您需要:

  • 使用startActivityForResult()onActivityResult()

  • 使用活动总线,或

  • 不要进行这两个单独的活动,而是将它们组合成一个活动,如果它们是紧密耦合的(例如,使用片段)