Android Hello World

02 Aug 2012

Here a quick documentation on how to build a C program using the Android NDK for Linux. The program can be run with the Android Terminal.

Here’s the Makefile.

NDK = $(HOME)/android-ndk-r8b
TOOLCHAIN = /tmp/ndk-hello
SYSROOT = $(TOOLCHAIN)/sysroot
GCC = $(TOOLCHAIN)/bin/arm-linux-androideabi-gcc
STRIP = $(TOOLCHAIN)/bin/arm-linux-androideabi-strip
CFLAGS = -march=armv7-a -mfloat-abi=softfp -I$(SYSROOT)/usr/include
LDFLAGS = -Wl,--fix-cortex-a8 -L$(SYSROOT)/usr/lib

all: $(TOOLCHAIN) hello

hello: hello.o
	$(GCC) $(LDFLAGS) -o $@ hello.o
	$(STRIP) -s $@

.c.o:
	$(GCC) $(CFLAGS) -o $@ -c $<

clean:
	rm -f hello *.o .*.un~

$(TOOLCHAIN):
	$(NDK)/build/tools/make-standalone-toolchain.sh --install-dir=$@

And here’s the C program hello.c.

#include <stdio.h>

int main(int argc, char** argv) {
   printf("Hello world!!!\n");
   return 0;
}

Running make should cross-compile the program.

Jan Wedekind

Android Hello World