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问题:

so I am getting this in logcat:

java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = com.resources.student_list.Student)

I know this means that my student class is not serializable, but it is, here is my student class:

import java.io.Serializable;   public class Student implements Comparable,  Serializable{      private static final long serialVersionUID = 1L;     private String firstName, lastName;     private DSLL gradeList;       public Student() {         firstName = "";         lastName = "";         gradeList = new DSLL();     }      public String getFirstName() {         return firstName;     }      public void setFirstName(String firstName) {         this.firstName = firstName;     }      public String getLastName() {         return lastName;     }      public void setLastName(String lastName) {         this.lastName = lastName;     }      public DSLL getGradeList() {         return gradeList;     }      public void setGradeList(DSLL gradeList) {         this.gradeList = gradeList;     }      public int compareTo(Student arg0) {         return this.lastName.compareTo(arg0.getLastName());     }  }

and this is the code that is using the getIntent() method:

public void onItemClick(AdapterView> parent, View viewClicked, int pos,                                 long id) {                              Student clickedStudent = studentList.get(pos);                             int position = pos;                             Intent intent = new Intent(getActivity().getApplicationContext(), ShowStudentActivity.class);                             Log.e("CINTENT","CREATED!!!");                             intent.putExtra("clickedStudent",clickedStudent);                             intent.putExtra("newStudentList",newStudentList);                             intent.putExtra("position",position);                             Log.e("putExtra","Passed");                             Log.e("Start activity","passed");                             startActivity(intent);                          }                       });

please help me figure out whats wrong with this.

here is the whole LogCat:

04-17 16:12:28.890: E/AndroidRuntime(22815): FATAL EXCEPTION: main 04-17 16:12:28.890: E/AndroidRuntime(22815): java.lang.RuntimeException: Parcelable encountered IOException writing serializable object (name = com.resources.student_list.Student) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.os.Parcel.writeSerializable(Parcel.java:1181) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.os.Parcel.writeValue(Parcel.java:1135) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.os.Parcel.writeMapInternal(Parcel.java:493) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.os.Bundle.writeToParcel(Bundle.java:1612) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.os.Parcel.writeBundle(Parcel.java:507) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.content.Intent.writeToParcel(Intent.java:6111) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:1613) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.app.Instrumentation.execStartActivity(Instrumentation.java:1422) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.app.Activity.startActivityForResult(Activity.java:3191) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.support.v4.app.FragmentActivity.startActivityFromFragment(FragmentActivity.java:848) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.support.v4.app.Fragment.startActivity(Fragment.java:878) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at com.example.student_lists.MainActivity$DummySectionFragment$2.onItemClick(MainActivity.java:477) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.widget.AdapterView.performItemClick(AdapterView.java:292) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.widget.AbsListView.performItemClick(AbsListView.java:1058) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.widget.AbsListView$PerformClick.run(AbsListView.java:2514) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.widget.AbsListView$1.run(AbsListView.java:3168) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.os.Handler.handleCallback(Handler.java:605) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.os.Handler.dispatchMessage(Handler.java:92) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.os.Looper.loop(Looper.java:137) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.app.ActivityThread.main(ActivityThread.java:4447) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.lang.reflect.Method.invokeNative(Native Method) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.lang.reflect.Method.invoke(Method.java:511) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at dalvik.system.NativeStart.main(Native Method) 04-17 16:12:28.890: E/AndroidRuntime(22815): Caused by: java.io.NotSerializableException: com.resources.student_list.DSLL$DNode 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1364) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:368) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeFieldValues(ObjectOutputStream.java:979) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:368) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1074) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1404) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1671) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1517) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1481) 04-17 16:12:28.890: E/AndroidRuntime(22815):    at android.os.Parcel.writeSerializable(Parcel.java:1176)

回答1:

Caused by: java.io.NotSerializableException: com.resources.student_list.DSLL$DNode

Your DSLL class appears to have a DNode static inner class, and DNode is not Serializable.

回答2:

If you can't make DNode serializable a good solution would be to add "transient" to the variable.

Example:

public static transient DNode dNode = null;

This will ignore the variable when using Intent.putExtra(...).

回答3:

Your OneThread Class also should implement Serializable. All the sub classes and inner sub classes must implements Serializable.

this is worked for me...

回答4:

The problem occurs when your custom class has for property some other class e.g. "Bitmap". What I made is to change the property field from "private Bitmap photo" to "private transient Bitmap photo". However the image is empty after I getIntent() in the receiver activity. Because of this I passed the custom class to the intent and also I've created a byte array from the image and pass it separatly to the intent:

selectedItem is my custom object and getPlacePhoto is his method to get image. I've already set it before and now I just get it first than convert it and pass it separatly:

 Bitmap image = selectedItem.getPlacePhoto();  image.compress(Bitmap.CompressFormat.PNG, 100, stream);  byte[] byteArray = stream.toByteArray();  Intent intent = new Intent(YourPresentActivity.this,   TheReceiverActivity.class);  intent.putExtra("selectedItem", selectedItem);                   intent.putExtra("image", byteArray);  startActivity(intent);

Then in the receiver activity I get my object and the image as byte array, decode the image and set it to my object as photo property.

 Intent intent = getIntent();  selectedItem = (ListItem) intent.getSerializableExtra("selectedItem");  byte[] byteArray = getIntent().getByteArrayExtra("image");  Bitmap image = BitmapFactory.decodeByteArray(byteArray, 0,   byteArray.length);  selectedItem.setPhoto(image);

回答5:

I am also phase these error and i am little bit change in modelClass which are implemented Serializable interface like:

At that Model class also implement Parcelable interface with writeToParcel() override method

Then just got error to "create creator" so CREATOR is write and also create with modelclass contructor with arguments & without arguments..

       @Override         public void writeToParcel(Parcel dest, int flags) {             dest.writeString(id);             dest.writeString(name);         }          protected ArtistTrackClass(Parcel in) {             id = in.readString();             name = in.readString();         }         public ArtistTrackClass() {          }      public static final Creator CREATOR = new Creator() {         @Override         public ArtistTrackClass createFromParcel(Parcel in) {             return new ArtistTrackClass(in);         }          @Override         public ArtistTrackClass[] newArray(int size) {             return new ArtistTrackClass[size];         }     };

Here,

ArtistTrackClass -> ModelClass

Constructor with Parcel arguments "read our attributes" and writeToParcel() is "write our attributes"

回答6:

the Grade class must also implement Serializable

public class Grade implements Serializable { .....your content.... }

回答7:

For me this was resolved by making the variable withing the class transient.

Code before:

public class UserLocation implements Serializable {    public Location lastKnownLocation;    public UserLocation() {} }

code after

public class UserLocation implements Serializable {     public transient Location lastKnownLocation;     public UserLocation() {} }

文章来源: Parcelable encountered IOException writing serializable object getactivity()

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