How to serialize a Bundle?

android serialization bundle
hermo picture hermo · Apr 8, 2010 · Viewed 16.3k times · Source

I'd like to serialize a Bundle object, but can't seem to find a simple way of doing it. Using Parcel doesn't seem like an option, since I want to store the serialized data to file.

Any ideas on ways to do this?

The reason I want this is to save and restore the state of my activity, also when it's killed by the user. I already create a Bundle with the state I want to save in onSaveInstanceState. But android only keeps this Bundle when the activity is killed by the SYSTEM. When the user kills the activity, I need to store it myself. Hence i'd like to serialize and store it to file. Of course, if you have any other way of accomplishing the same thing, i'd be thankful for that too.

Edit: I decided to encode my state as a JSONObject instead of a Bundle. The JSON object can then be put in a Bundle as a Serializable, or stored to file. Probably not the most efficient way, but it's simple, and it seems to work ok.

Answer

reflog picture reflog · Apr 8, 2010

storing any Parcelable to a file is very easy:

FileOutputStream fos = context.openFileOutput(localFilename, Context.MODE_PRIVATE);
Parcel p = Parcel.obtain(); // i make an empty one here, but you can use yours
fos.write(p.marshall());
fos.flush();
fos.close();

enjoy!

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