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In order to install an Android application onto a device, you first need to sign the Android package (.apk file) with the digital signature of a certificate. The certificate, however, can be self-signed you do not need to purchase a certificate from a certificate authority such as VeriSign. Signing your application for deployment involves two steps. The first step is to generate a certificate using the keytool (or similar tool). The second step involves using the jarsigner tool (or similar tool) to sign the .apk file with the signature of the generated certificate. Note that during development, the ADT plug-in for Eclipse takes care of signing your .apk file before deploying onto the emulator. Moreover, the default certificate used for signing during development cannot be used for production deployment onto a real device.

The format of each message in pseudocode is the following: DATETIME HOST IDENT COLON MESSAGE IDENT is a string provided by the application making the log entry. On some systems (Linux included), this string might contain spaces and might even contain special characters (which is everything except NULL characters). Although you could probably use a lexer to handle this particular task, the following example uses both a lexer and a parser to demonstrate the concepts.

responsibility of the getType() method is to distinguish the type of the URI. Is it a collection of books, or a single book As we pointed out in the previous section, we will use the UriMatcher to decipher this URI type. Depending on this URI, the BookTableMetaData class has defined the MIMEtype constants to return for each URI. Without further ado, we present the complete code for the getType() method implementation in Listing 3 26.

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Listing 3 26. The getType() Method Implementation @Override public String getType(Uri uri) { switch (sUriMatcher.match(uri)) { case INCOMING_BOOK_COLLECTION_URI_INDICATOR: return BookTableMetaData.CONTENT_TYPE; case INCOMING_SINGLE_BOOK_URI_INDICATOR: return BookTableMetaData.CONTENT_ITEM_TYPE; default: throw new IllegalArgumentException("Unknown URI " + uri); } }

The keytool utility manages a database of private keys and their corresponding X.509 certificates (a standard for digital certificates). This utility ships with the JRE and resides under the JRE bin directory.

The lexer, which is stored in a file called syslog_lexer.mll in the example, is quite short even though it also includes the main executable code within it. You are basically defining only five tokens to handle the kinds of data found in syslog files. { open Syslog_parser } let time = ['0'-'9']['0'-'9']':'['0'-'9']['0'-'9']':'['0'-'9']['0'-'9'] rule tokens = parse [' ' '\t']+ { tokens lexbuf } | (['a'-'z' 'A'-'Z']+[' ']+['0'-'9']+[' ']+time as dt) { DATETIME(dt) } | ':' { COLON } | [^ ' ' '\t' '\n']+ { WORD(Lexing.lexeme lexbuf) } | '\n' { EOL } | eof { EOF } { let tostring (n, m, l, k) = Printf.printf "%s|%s|%s|%s\n" n m l k;; let _ = let ichan = open_in "messages" in let lb = Lexing.from_channel ichan in try let p = Syslog_parser.main tokens lb in match p with [] -> close_in ichan

The query method in a content provider is responsible for returning a collection of rows depending on an incoming URI and a where clause. Like the other methods, the query method uses UriMatcher to identify the URI type. If the URI type is a single-item type, the method retrieves the book ID from the incoming URI like this: 1. 2. It extracts the path segments using getPathSegments(). It indexes into the URI to get the first path segment, which happens to be the book ID.

The query method then uses the projections that we created in Listing 3 25 to identify the return columns. In the end, query returns the cursor to the caller. Throughout this process, the query method uses the SQLiteQueryBuilder object to formulate and execute the query (see Listing 3 27).

| h :: t -> close_in ichan;tostring h with Parsing.Parse_error -> Printf.printf "Between location %i and %i near '%s'" (Lexing.lexeme_start lb) (Lexing.lexeme_end lb) (Lexing.lexeme lb); close_in ichan; exit(1) | Failure(x) -> Printf.printf "Between location %i and %i near '%s'" (Lexing.lexeme_start lb) (Lexing.lexeme_end lb) (Lexing.lexeme lb); close_in ichan; exit(1)

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