Hi Elk, Thanks again for your time and specifying your points. Finally I found out the problem why the code wasn't working after lot of debugging. Turned out that the table name and the Uri given was wrong. A stupid typo was the issue.
Also, sorry I can't post the original code as I am under legal restriction for not publishing my customer's code. Hence, I had to improvise and write the whole thing. @Brion, Sorry for hacking the message. I didn't know this and in future I will make sure not to hack existing message and will open new one. Thanks everyone for helping. Finally I am able to make something...working !!! ~Arpit. On Sep 9, 11:29 pm, "A. Elk" <[email protected]> wrote: > As far as I can tell from what you've posted, you're declaring > CONTENT_URI as a String or some sort of string-related immutable > class. If you look at the NotePad example, CONTENT_URI is of type Uri, > and it's constructed using Uri.parse. > > You may be doing this, but what you've posted doesn't indicate it. > Always be sure to post the exact code you're using. > > My first suggestion is to double-check that you have constructed the > content URI correctly in the code, using Uri.parse. > > Next, do some debugging. I assume that what you *think* you're passing > to your content provider is not what is actually getting to it. I also > assume that you're already doing some debugging, since you know that > uri.Match is returning -1. > > On Sep 8, 10:21 pm,Arpit<[email protected]> wrote: > > > > > Somehow myUriMatcheris not working properly and because of that I am > > not able to do the CRUD operations on my tables. > > > I have the following structure of packages and classes: > > > com.arpit.provider : This has a class MyContentProvider which extends > > ContentProvider class > > com.arpit.tables : > > DatabaseHelper extends SQLiteOpenHelper > > KeyTable implements BaseColumns > > ParticipantTable implements BaseColumns > > > Now in MyContentProvider, I have done the following: > > > ... > > public static final String AUTHORITY = > > "com.arpit.provider.MyContentProvider"; > > ... > > static{ > > UriMatcheruriM = newUriMatcher(UriMatcher.NO_MATCH); > > uriM.addUri(AUTHORITY, "key", 0); > > uriM.addUri(AUTHORITY, "participant", 1);} > > > ... > > public Cursor query(Uri uri, String[] projection, String selection, > > String[] selectionArgs, String sortOrder) { > > SQLiteQueryBuilder qb = new SQLiteQueryBuilder(); > > switch(uriM.match(uri)){ > > case 0: > > qb.setTables("key"); > > break; > > case 1: > > qb.setTables("participant"); > > break; > > } > > ....} > > > ... > > > In my KeyTable class, CONTENT_URI = "content://" + > > MyContentProvider.AUTHORITY + "/key"; > > In my ParticipantTable class CONTENT_URI = "content://" + > > MyContentProvider.AUTHORITY + "/participant"; > > > In my AndroidManifest.xml file I have registered the provider as: > > > <provider android:name="com.arpit.providers.MyContentProvider" > > android:authorities="com.arpit.providers.MyContentProvider"></ > > provider> > > > Now I make the query call with the following statement in my > > HomeActivity: > > > Cursor cursor = getContentResolver().query(KeyTable.CONTENT_URI, new > > String[] { KeyTable.col1 }, "_id='1'", null, null); > > > My problem is when the Query Method is called and the Switch block is > > executed the uriM.match returns always -1 (irrespective of whether it > > is KeyTable.CONTENT_URI or ParticipantTable.CONTENT_URI). > > > Could you let me know what wrong am I doing because of which it is not > > working. > > > From the note pad example I see during debug the only difference is > > they call managedQuery instead of getContentReslover().query(...). I > > tried firing managedQuery(...) in my HomeActivity class, but that also > > result in uriM.match(uri) to return -1. > > > It will be great if you could help me out. > > > Thanks & Regards, > >Arpit > > > On Aug 25, 10:20 pm, "A. Elk" <[email protected]> wrote: > > > > The Note Pad example is pretty good for URI content matching. > > > > Basically, you define one or more URIs for a ContentProvider. Don't > > > think of them as "URLs", just think of them as strings with a > > > particular format. Using web domains in them is a easy, nearly > > > foolproof way to ensure that each URI is unique. For example, I can > > > safely use the content URI > > > content://database.lancaster.dambusters.gmail.com > > > because that's my unique GMail address. > > > > Patterns come in when you want a ContentProvider to return different > > > things depending on the exact URI. In the Note Pad sample (*not* the > > > tutorial), there are 3 patterns corresponding to 3 "forms" of data: a > > > list of notes, a single note, or a set of notes compatible with the > > > LiveFolder widget. The "list of notes" form is set up in the code and > > > the manifest so that it returns a set of records. The single note > > > returns exactly one note, and I forget offhand what LiveFolders does. > > > Let's look at the first two. > > > > For set of notes, you just specify a "base" URI. The Provider returns > > > all the notes in the database that match your criteria. > > > > For a single note, you specify a pattern that is the "single note" > > > base URI with a note ID number appended to it. The ID number is the > > > value of the "_ID" column for the record you want. The Provider > > > returns that particular note. As written, the Provider can also filter > > > the note by selection criteria. > > > > If you look in the code for the Provider, you'll see that it defines > > > aUriMatcher. You useUriMatcher.addUri() to match an "authority" (a > > > base URI without a specific pattern) and a pattern to a value. When a > > > URI comes in to the query() method, you useUriMatcher.match to match > > > the incoming URI to a pattern. The method returns the value that you > > > associated with the pattern in addUri(). TheUriMatcheris defined in > > > a static block at the end of the code. > > > > As a note, you can use "?" in a pattern as a wildcard to match any > > > string, and "#" to match any number. The "#" is used to match a single > > > note in Note Pad. > > > > The Note Pad code is hard to understand because it's designed to > > > accept alternate actions. This allows other apps to access the > > > ContentProvider by specifying the proper authority and MimeType. You > > > can ignore this, basically. The mime type tells the calling app what > > > it's gonna get back from the Provider. If the type is > > > vnd.android.cursor.dir, then the calling app knows it may get back > > > more than one row, whereas if it gets back cursor.item, it gets back > > > only one item. Incoming Intents have to specify a mimeType so that > > > they exactly match Note Pad's intent filters. For example, an app that > > > sends an Intent with action.GET_CONTENT but mime type > > > vnd.android.cursor.dir won't match any of Note Pad's intent filters. > > > > The elkmeister. -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
