CODEWITHSUNDEEP
androidandroid-contentprovidersearchview
Ajay Bhojak
Ajay Bhojak

Reputation: 1159

ContentProvider for multiple databases/ContentProviders

Can anyone tell how can I create a ContentProvider which can query multiple database/ContentProviders for search suggestions provided by SearchView.

Upvotes: 1

Views: 741

Answers (1)

memo4mj
memo4mj

Reputation: 21

With ContentProviders, you are querying for data using a ContentUrl which would look something like this 

content://<authority>/<data_type>/<id>

authority is the content provider name, e.g. contacts or for custom one will be com.xxxxx.yyy.

data_type and id are to specify what data you need from the provide and, if needed, a specific value for the key.

So, if you are building your custom content provider you need to parse the content uri which you get as a parameter in the query function and decide what data you need to return as Cursor. UriMatcher class is very good choice for this case. Here is an example

static final String URL = "content://com.mycompany.myapp/students";
static final Uri CONTENT_URI = Uri.parse(URL);

static final UriMatcher uriMatcher;
static{
  uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
  uriMatcher.addURI("com.mycompany.myapp", "students", 1);
  uriMatcher.addURI("com.mycompany.myapp", "students/#", 2);
}

then in your query function, you would have something like this:

switch (uriMatcher.match(uri)) {
  case 1:
     // we are querying for all students
     // return a cursor all students e.g. "SELECT * FROM students"
     break;
  case 2:
     // we are querying for all students
     // return a cursor for the student matching the given id (the last portion of uri)
     // e.g. "SELECT * FROM students WHERE _id = n"
     break;
  default:
     throw new IllegalArgumentException("Unknown URI " + uri);
  }

I hope this answers your question and direct you to the right track.

You can see a good article with full example about how to use them, here http://www.tutorialspoint.com/android/android_content_providers.htm

Upvotes: 2

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