android - Why can I pass a serializable with a bitmap through a Bundle but get an error when the system tries to serialize it? -

so have class, image implements serializable:

public class contact implements serializable {     ...     public static final string contact_key = "contactkey";     private transient bitmap mimage;     ... } 

i pass fragment:

bundle bundle = new bundle(); final fragmentmanager fragmentmanager = getfragmentmanager();  // load fragment fragment contactfragment = new contactfragment(); contactfragment.setarguments(bundle); fragmentmanager.begintransaction()             .replace(r.id.contactcontainer, headerfragment, "contactfragment")             .commit(); 

and pull image out (successfully) , use it:

public class contactfragment extends fragment {     private static final string tag = "contactfragment";      @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate)     {         bundle arguments = getarguments();         if (arguments != null)         {             contact contact = (contact) arguments.getserializable(contact.contact_key);             viewgroup view = (viewgroup)inflater.inflate(r.layout.contact, container, false);             if (view != null && contact != null)             {                 imageview imageview = (imageview) view.findviewbyid(r.id.contactimage);                 if (imageview != null)                 {                     if (contact.hasimage())                     {                         imageview.setimagebitmap(contact.image());                     }                 }             }         }     } } 

but when background app receive runtime exception system:

process: my.package, pid: 11680     java.lang.runtimeexception: parcelable encountered ioexception writing serializable object (name = my.package.contact)             @ android.os.parcel.writeserializable(parcel.java:1316)             @ android.os.parcel.writevalue(parcel.java:1264)             @ android.os.parcel.writearraymapinternal(parcel.java:618)             @ android.os.bundle.writetoparcel(bundle.java:1692)             @ android.os.parcel.writebundle(parcel.java:636)             @ android.app.fragmentstate.writetoparcel(fragment.java:132)             @ android.os.parcel.writetypedarray(parcel.java:1133)             @ android.app.fragmentmanagerstate.writetoparcel(fragmentmanager.java:373)             @ android.os.parcel.writeparcelable(parcel.java:1285)             @ android.os.parcel.writevalue(parcel.java:1204)             @ android.os.parcel.writearraymapinternal(parcel.java:618)             @ android.os.bundle.writetoparcel(bundle.java:1692)             @ android.os.parcel.writebundle(parcel.java:636)             @ android.app.activitymanagerproxy.activitystopped(activitymanagernative.java:2467)             @ android.app.activitythread$stopinfo.run(activitythread.java:3084)             @ android.os.handler.handlecallback(handler.java:733)             @ android.os.handler.dispatchmessage(handler.java:95)             @ android.os.looper.loop(looper.java:136)             @ android.app.activitythread.main(activitythread.java:5001)             @ java.lang.reflect.method.invoke(native method)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:785)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:601)      caused by: java.io.notserializableexception: android.graphics.bitmap             @ java.io.objectoutputstream.writenewobject(objectoutputstream.java:1364)             @ java.io.objectoutputstream.writeobjectinternal(objectoutputstream.java:1671)             @ java.io.objectoutputstream.writeobject(objectoutputstream.java:1517)             @ java.io.objectoutputstream.writeobject(objectoutputstream.java:1481)             @ java.io.objectoutputstream.writefieldvalues(objectoutputstream.java:979)             @ java.io.objectoutputstream.defaultwriteobject(objectoutputstream.java:368)             @ java.io.objectoutputstream.writehierarchy(objectoutputstream.java:1074)             @ java.io.objectoutputstream.writenewobject(objectoutputstream.java:1404)             @ java.io.objectoutputstream.writeobjectinternal(objectoutputstream.java:1671)             @ java.io.objectoutputstream.writeobject(objectoutputstream.java:1517)             @ java.io.objectoutputstream.writeobject(objectoutputstream.java:1481)             @ android.os.parcel.writeserializable(parcel.java:1311)             @ android.os.parcel.writevalue(parcel.java:1264)             at android.os.parcel.writearraymapinternal(parcel.java:618)             at android.os.bundle.writetoparcel(bundle.java:1692)             at android.os.parcel.writebundle(parcel.java:636)             at android.app.fragmentstate.writetoparcel(fragment.java:132)             at android.os.parcel.writetypedarray(parcel.java:1133)             at android.app.fragmentmanagerstate.writetoparcel(fragmentmanager.java:373)             at android.os.parcel.writeparcelable(parcel.java:1285)             at android.os.parcel.writevalue(parcel.java:1204)             at android.os.parcel.writearraymapinternal(parcel.java:618)             at android.os.bundle.writetoparcel(bundle.java:1692)             at android.os.parcel.writebundle(parcel.java:636)             at android.app.activitymanagerproxy.activitystopped(activitymanagernative.java:2467) 

presumably tries preserve fragments arguments.

i know shouldn't trying serialize bitmap this, question why work? android doing kind of optimization?

in both cases contact serialized what's going on?

caused by: java.io.notserializableexception: android.graphics.bitmap

ok clarify bitmaps not serializable i.e. can't broken down , saved disk (hard cache).

in first case, using soft cache map maybe, bitmap can saved in memory. (soft cache)

when background app, system tries save data disk has serialize things , thats when crash.

make sense?