Android :: Changing Package Name But Keeping Database

Sep 7, 2010

I've created an Android application which has a certain package name that I've been using personally for months now. I'm about to release it on the market, and I have to change the package name. This cannot be avoided.

My issue is that the application has an SQLite database attached to it that I want to keep, but I know if I change the package name, it'll install as a separate application and I'll have to restart my database, which would take a very long time.

Is there a good way to change a package name while maintaining the SQLite database? Or at least moving the database easily? This will just be for my own phone since it hasn't been released to the public yet.

Android :: Changing package name but keeping database


Android :: Keeping Data In Memory And Database At Same Time

Sep 9, 2010

We're designing an Android app that has a lot of data ("customers", "products", "orders"...), and we don't want to query sqlite every time we need some record. We wanna avoid to query database as most as we can, so we decided to keep certain data allways in memory.

Our initial idea is to create 2 simple classes:

"MemoryRecord": a class that will contain basically an array of objects (string/int/double/datetime/etc...), that are the data from a table record, and all methods to get those data in/out from this array.
"MemoryTable": a class that will contain basically a Map of [Key,MemoryRecord] and all methods to manipulate this Map and insert/update/delete record into/from database.

Those classes will be derived to every kind of table we have in database. Of course that there are other usefull methods not listed above, but they are not important at this point.

So, when starting app, we will load those tables from SQLite database to memory using those classes, and every time we need to change some data, we will change in memory and post it into database right after.

But, we want some help/advice from you. Can you suggest something more simple or efficient to implement such thing? Or maybe some existing classes that already do it for us?

Update:

I understand what you guys are trying to show me, and I thank you for that.

But, let's say we have a table with 2000 records, and I will to list those records. For each one, I have to query other 30 tables (some of them with 1000 records, others with 10 records) to add additional info in the list, and this while it's "flying" (and as you know , we must be very fast at this momment).

Now you'll gonna say: "just build your main query with all those 'joins', and bring all you need in one step. SQLite can be very fast, if your database is well designed, etc...".

OK, but this query will become very complicated and sure, even SQLite be very fast, it will be "too" slow (2 a 4 seconds, as I confirmed, and this isn't a acceptable time for us).

Another complicator is that, depending of user interaction, we need to "re-query" all records, because the tables involved are not the same, and we have to "re-join" with another set of tables.

So, an alternative is bring only the main records (this will never change, no matter what user does or wants) with no join (this is very fast!) and query the others tables every time we want some data. Note that on the table with 10 records only, we will fetch the same records many and many times. In this case, it is a wast of time, because no matter fast sqlite be, it will allways be more expensive to query/cursor/fetch/etc... than just grab the record from a kind of "memory cache". I want to make clear that we don't plan to keep all data in memory allways, just some tables we query very offten.

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Am I using CursorAdapter correctly? What is the standard way of keeping the list updated with the database? And what does autoRequery do?

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Android :: Keeping Service Alive Across Configuration Changes

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The only choices seem to be:
-- override onConfigurationChanged in the activity. Feels ok, but non - conformant.
-- explicitly start the service & only stop it when the last activity gets an onDestroy that's not due to a config change (i.e., there was no call to onRetainNonConfigurationInstance). Feels icky.
-- explicitly start the service & don't stop it until some amount of time after the last unbind. Ickier.

On a related note, what happens between activity switches within a process, where the first activity (A) starts the next activity (B) & then calls finish() -- is there a guarantee that B.onCreate is called before A.onDestroy? If not, and the activities share a service, the same issue of keeping the service alive during this window exists, but with only the icky workarounds.

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