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POdb4o on Android 3.0+ Issue
 

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    <p>I'm having an issue with db4o on Android 3.0+ because it turns out that on the creation of the db4o database, it uses some of the network apis by default. (I stumbled upon this post: <a href="http://mavistechchannel.wordpress.com/2011/11/18/db4o-at-honeycomb-and-ice-cream-sandwich/" rel="nofollow">http://mavistechchannel.wordpress.com/2011/11/18/db4o-at-honeycomb-and-ice-cream-sandwich/</a> about it)</p> <p>However, I've attempted to make the db creation requests async, but I think I'm running into an issue of calling the db before it's fully created as it locks the DB. (And I now get a locking error) Is there any way I can do this synchronous? or, at a minimum wait until it's been finished? Here's my db4o helper:</p> <pre><code>public class Db4oHelperAsync implements Constants{ private static final String USE_INTERNAL_MEMORY_FOR_DATABASE = "USE_INTERNAL_MEMORY_FOR_DATABASE"; private static ObjectContainer oc = null; private Context context; /** * @param ctx */ public Db4oHelperAsync(Context ctx) { context = ctx; } /** * Create, open and close the database */ public ObjectContainer db() { if (oc == null || oc.ext().isClosed()) { if (Utilities.getPreferences(context).getBoolean(USE_INTERNAL_MEMORY_FOR_DATABASE, true)) { new GetDbFromInternalMemory().execute(); } else { new GetDbFromSDCard().execute(); } return oc; } else { return oc; } } /** * Configure the behavior of the database */ private EmbeddedConfiguration dbConfig() throws IOException { EmbeddedConfiguration configuration = Db4oEmbedded.newConfiguration(); configuration.common().objectClass(PersistentObjectWithCascadeOnDelete.class).objectField("name").indexed(true); configuration.common().objectClass(PersistentObjectWithCascadeOnDelete.class).cascadeOnUpdate(true); configuration.common().objectClass(PersistentObjectWithCascadeOnDelete.class).cascadeOnActivate(true); configuration.common().objectClass(PersistentObjectWithCascadeOnDelete.class).cascadeOnDelete(true); configuration.common().objectClass(PersistentObjectWithoutCascadeOnDelete.class).objectField("name").indexed(true); configuration.common().objectClass(PersistentObjectWithoutCascadeOnDelete.class).cascadeOnUpdate(true); configuration.common().objectClass(PersistentObjectWithoutCascadeOnDelete.class).cascadeOnActivate(true); return configuration; } /** * Returns the path for the database location */ private String db4oDBFullPathInternal(Context ctx) { return ctx.getDir("data", 0) + "/" + "testapp.db4o"; } private String db4oDBFullPathSdCard(Context ctx) { File path = new File(Environment.getExternalStorageDirectory(), ".testapp"); if (!path.exists()) { path.mkdir(); } return path + "/" + "testapp.db4o"; } /** * Closes the database */ public void close() { if (oc != null) oc.close(); } private class GetDbFromInternalMemory extends AsyncTask&lt;Void, Void, ObjectContainer&gt;{ @Override protected ObjectContainer doInBackground(Void... params) { try { ObjectContainer obj = Db4oEmbedded.openFile(dbConfig(), db4oDBFullPathInternal(context)); CLog.v("USING INTERNAL MEMORY FOR DATABASE"); return obj; } catch (Exception ie) { ie.printStackTrace(); CLog.e(Db4oHelper.class.getName(), ie.toString()); return null; } } @Override protected void onPostExecute(ObjectContainer result) { oc = result; } } private class GetDbFromSDCard extends AsyncTask&lt;Void, Void, ObjectContainer&gt;{ @Override protected ObjectContainer doInBackground(Void... params) { try { ObjectContainer obj = Db4oEmbedded.openFile(dbConfig(), db4oDBFullPathSdCard(context)); CLog.v("USING SDCARD FOR DATABASE"); SharedPreferences.Editor edit = Utilities.getPreferencesEditor(context); edit.putBoolean(USE_INTERNAL_MEMORY_FOR_DATABASE, true); edit.commit(); return obj; } catch (Exception ie) { ie.printStackTrace(); CLog.e(Db4oHelper.class.getName(), ie.toString()); return null; } } @Override protected void onPostExecute(ObjectContainer result) { oc = result; } } } </code></pre>
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