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The examples we ve shown so far created a new HttpClient for each request. In practice, however, you should create one HttpClient for the entire application and use that for all of your HTTP communication. With one HttpClient servicing all of your HTTP requests, you should also pay attention to multithreading issues that could surface if you make multiple simultaneous requests through the same HttpClient. Fortunately, the HttpClient provides facilities that make this easy all you have to do is create the DefaultHttpClient using a ThreadSafeClientConnManager, as shown in Listing 8-6. Listing 8-6. Creating an HttpClient for Multithreading Purposes // ApplicationEx.java import org.apache.http.HttpVersion; import org.apache.http.client.HttpClient; import org.apache.http.conn.ClientConnectionManager; import org.apache.http.conn.scheme.PlainSocketFactory; import org.apache.http.conn.scheme.Scheme; import org.apache.http.conn.scheme.SchemeRegistry; import org.apache.http.conn.ssl.SSLSocketFactory; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager; import org.apache.http.params.BasicHttpParams; import org.apache.http.params.HttpParams; import org.apache.http.params.HttpProtocolParams; import org.apache.http.protocol.HTTP; import android.app.Application; import android.util.Log; public class ApplicationEx extends Application { private static final String TAG = "ApplicationEx"; private HttpClient httpClient; @Override public void onCreate() { super.onCreate(); httpClient = createHttpClient(); }

The delete method in a content provider is responsible for deleting a record based on the where clause that is passed in. The delete method then returns the number of rows deleted in the process. Like the other methods, delete uses UriMatcher to identify the URI type. If the URI type is a collection type, the where clause is passed through so you can delete as many records as possible. If the where clause is null, all records will be deleted. If the URI type is a single-record type, the book ID is extracted from the URI and specified as an additional where clause. In the end, the code returns the number of records deleted (see Listing 3 30).

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Listing 3 30. The delete() Method Implementation @Override public int delete(Uri uri, String where, String[] whereArgs) { SQLiteDatabase db = mOpenHelper.getWritableDatabase(); int count; switch (sUriMatcher.match(uri)) { case INCOMING_BOOK_COLLECTION_URI_INDICATOR: count = db.delete(BookTableMetaData.TABLE_NAME, where, whereArgs);

Now you can move on to a more complex example, which is a log file that has various kinds of entries some of which span multiple lines.

@Override public void onLowMemory() { super.onLowMemory(); shutdownHttpClient(); } @Override public void onTerminate() { super.onTerminate(); shutdownHttpClient(); }

break; case INCOMING_SINGLE_BOOK_URI_INDICATOR: String rowId = uri.getPathSegments().get(1); count = db.delete(BookTableMetaData.TABLE_NAME , BookTableMetaData._ID + "=" + rowId + (!TextUtils.isEmpty(where) " AND (" + where + ')' : "") , whereArgs); break; default: throw new IllegalArgumentException("Unknown URI " + uri); } getContext().getContentResolver().notifyChange(uri, null); return count; }

We ve mentioned the UriMatcher class several times now; let s look into it. Almost all methods in a content provider are overloaded with respect to the URI. For example, the same query() method is called whether you want to retrieve a single book or a list of multiple books. It is up to the method to know which type of URI is being requested. Android s UriMatcher utility class helps you identify the URI types. Here s how it works: you tell an instance of UriMatcher what kind of URI patterns to expect. You will also associate a unique number with each pattern. Once these patterns are registered, you can then ask UriMatcher if the incoming URI matches a certain pattern. As we ve mentioned, our BookProvider content provider has two URI patterns: one for a collection of books, and one for a single book. The code in Listing 3 31 registers both these patterns using UriMatcher. It allocates 1 for a collection of books and a 2 for a single book (the URI patterns themselves are defined in the metadata for the books table).

This log file has four basic kinds of entries: connection, disconnection, heartbeat, and command. Only clients can issue commands.

private HttpClient createHttpClient() { Log.d(TAG,"createHttpClient()..."); HttpParams params = new BasicHttpParams(); HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1); HttpProtocolParams.setContentCharset(params, HTTP.DEFAULT_CONTENT_CHARSET); HttpProtocolParams.setUseExpectContinue(params, true);

Listing 3 31. Registering URI Patterns with UriMatcher private static final UriMatcher sUriMatcher; //define ids for each uri type private static final int INCOMING_BOOK_COLLECTION_URI_INDICATOR = 1; private static final int INCOMING_SINGLE_BOOK_URI_INDICATOR = 2; static { sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH); //Register pattern for the books sUriMatcher.addURI(BookProviderMetaData.AUTHORITY , "books" , INCOMING_BOOK_COLLECTION_URI_INDICATOR); //Register pattern for a single book sUriMatcher.addURI(BookProviderMetaData.AUTHORITY , "books/#", INCOMING_SINGLE_BOOK_URI_INDICATOR);

Now that this registration is in place, you can see how UriMatcher plays a part in the query-method implementation:

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