Building Android applications in C in Java

Paint Denso QR Bar Code in Java Building Android applications in C

Building Android applications in C
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sections are required and that the values provided are an allowable address range for these sections. The linker takes care of putting these sections into the resulting executable file. Attempting to run the application without these sections results in code that crashes.
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All credit for this crt.S file belongs to the author of a blog found at http://honeypod.blogspot.com/2007/12/initialize-libc-for-android.html. You can find additional reference material for low-level Android programming information at http://benno.id.au.
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Now that you ve found an adequate startup routine, we ll show you how to add this routine to your application. The compiler handles the assembly file just like a C language file:
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arm-none-linux-gnueabi-gcc -c -o crt0.o crt.S
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The resulting object file, crt0.o, is passed to the linker as an input file, just as any other object file would be. Also, the entry switch to the linker must now specify _start rather than main:
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arm-none-linux-gnueabi-ld --entry=_start --dynamic-linker /system/bin/linker -nostdlib -rpath /android/system/lib -rpath-link /android/system/lib -L \android\system\lib -l c -l android_runtime -l sqlite -o hellodynamic hello.o crt0.o
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At this point, you should feel confident that you can build applications for Android/ Linux, so it s time to build something useful. The next section walks through the construction of a DayTime Server.
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13.3 What time is it The DayTime Server
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Although we don t talk about it much today, Linux systems (and more generically, Unix systems) have a service running that provides the server s current date and time. This application, known as a DayTime Server, typically runs as a daemon (which means it runs in the background and isn t connected to a particular shell). For our purposes, we ll implement a basic DayTime Server for Android/Linux, but we won t worry about turning it into a background service. This application helps exercise our interest in developing Android/Linux applications. First and most important, it s an application of some significance beyond a simple printf statement. Second, once this application is built, you ll write an Android/ Java application to interact with the DayTime Server.
13.3.1 DayTime Server application
Our DayTime Server application has a basic function: the application listens on a TCP port for incoming socket connections. When a connection is made, the application writes a short textual string representation of the date and time via the socket, closes the socket, and returns to listening for a new connection.
What time is it The DayTime Server
In addition to the TCP socket interactions, our application logs requests to a SQLite database. Why Because we can! The purpose of this application is to demonstrate nontrivial activities in the Android/Linux environment, including the use of the SQLite system library. Let s get started by examining the DayTime Server application.
13.3.2 daytime.c
The DayTime Server application can be broken into two basic functional parts. The first is the TCP socket server. Our DayTime Server application binds to TCP port 1024 when looking for new connections. Ordinarily, a daytime service binds to TCP port 13, but Linux has a security feature where only trusted users can bind to any port below 1023. The second feature is the insertion of data into a SQLite database. The following listing shows the code for the DayTime Server application.
Listing 13.8 daytime.c
#include <time.h> #include <stdio.h> Importing #include <string.h> required #include <errno.h> headers #include <arpa/inet.h> #include <netinet/in.h> #include <sys/socket.h> #include <resolv.h> Listening #include "sqlite3.h" port number int PORTNUMBER = 1024; #define htons(a) ( ((a & 0x00ff) << 8) | ((a & 0xff00) >> 8)) Defining void RecordHit(char * when) helpful macro { int rc; sqlite3 *db; char *zErrMsg = 0; char sql[200]; rc = sqlite3_open("daytime_db.db",&db); if( rc ) { printf( "Can't open database: %s\n", sqlite3_errmsg(db)); sqlite3_close(db); Interacting return; with SQLite } bzero(sql,sizeof(sql)); sprintf(sql,"insert into hits values (DATETIME('NOW'),'%s');",when); rc = sqlite3_exec(db, sql, NULL, 0, &zErrMsg); if( rc!=SQLITE_OK ) { printf( "SQL error: %s\n", zErrMsg); } sqlite3_close(db); }
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