Professional Android 4 Application Development

Adding Search to Your Application x 299
LISTING 8-31: Returning the correct MIME type for search results
@Override
public String getType(Uri uri) {
// Return a string that identifies the MIME type
// for a Content Provider URI
switch (uriMatcher.match(uri)) {
case ALLROWS:
return “vnd.android.cursor.dir/vnd.paad.elemental”;
case SINGLE_ROW:
return “vnd.android.cursor.item/vnd.paad.elemental”;
case SEARCH :
return SearchManager.SUGGEST_MIME_TYPE;
default:
throw new IllegalArgumentException(“Unsupported URI: “ + uri);
}
}
code snippet PA4AD_ Ch08_DatabaseSkeleton/src/MySearchSuggestionsContentProvider.java
The Search Manager requests your search suggestions by initiating a query on your Content
Provider, passing in the query value as the last element in the URI path. To provide suggestions, you
must return a Cursor using a set of predefined columns.
There are two required columns, SUGGEST_COLUMN_TEXT_1, which displays the search result text,
and _id, which indicates the unique row ID. You can supply up to two columns containing text, and
an icon to be displayed on either the left or right of the text results.
It’s also useful to include a SUGGEST_COLUMN_INTENT_DATA_ID column. The value returned in this
column can be appended to a specified URI path and used to populate an Intent that will be fired if
the suggestion is selected.
As speed is critical for real-time search results, in many cases it’s good practice to create a separate
table specifically to store and provide them. Listing 8-32 shows the skeleton code for creating a
projection that returns a Cursor suitable for search results.
LISTING 8-32: Creating a projection for returning search suggestions
public static final String KEY_SEARCH_COLUMN = KEY_COLUMN_1_NAME;
private static final HashMap SEARCH_SUGGEST_PROJECTION_MAP;
static {
SEARCH_SUGGEST_PROJECTION_MAP = new HashMap();
SEARCH_SUGGEST_PROJECTION_MAP.put(
“_id”, KEY_ID + “ AS “ + “_id”);
SEARCH_SUGGEST_PROJECTION_MAP.put(
SearchManager.SUGGEST_COLUMN_TEXT_1,
continues