Ab NDK r8d kann dies viel einfacher gelöst werden.
-
Erstellen Sie ein Projekt mit der folgenden Verzeichnishierarchie:
project/ jni/ Android.mk Application.mk *.c, *.cpp, *.h, etc.
-
Füllen Sie Android.mk mit dem folgenden Inhalt aus. Das Wichtigste ist die letzte Zeile. Überprüfen Sie die NDK-Dokumentation auf die Bedeutung der anderen Variablen.
LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := name-of-your-executable LOCAL_SRC_FILES := a.cpp b.cpp c.cpp etc.cpp LOCAL_CPPFLAGS := -std=gnu++0x -Wall -fPIE # whatever g++ flags you like LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog -fPIE -pie # whatever ld flags you like include $(BUILD_EXECUTABLE) # <-- Use this to build an executable.
-
Gehen Sie zu
einproject/
Verzeichnis, und geben Sie einfachndk-build
Das Ergebnis wird in
project/libs/<arch>/name-of-your-executable
abgelegt .
http://www.bekatul.info/content/native-c-application-android [kaputt (9. November 2015)]
Wayback Machine-Link
Um den Artikel zusammenzufassen...
Der Testcode lautet:
#include <stdio.h>//for printf
#include <stdlib.h>//for exit
int main(int argc, char **argv)
{
int i = 1;
i+=2;
printf("Hello, world (i=%d)!\n", i);
return 0;
exit(0);
}
Das Makefile ist:
APP := test
ROOT := /home/dd/android
INSTALL_DIR := /data/tmp
NDK_PLATFORM_VER := 8
ANDROID_NDK_ROOT := $(ROOT)/android-ndk-r5
ANDROID_NDK_HOST := linux-x86
ANDROID_SDK_ROOT := $(ROOT)/android-sdk-linux_86
PREBUILD := $(ANDROID_NDK_ROOT)/toolchains/arm-eabi-4.4.0/prebuilt/$(ANDROID_NDK_HOST)
BIN := $(PREBUILD)/bin/
LIB := $(ANDROID_NDK_ROOT)/platforms/android-$(NDK_PLATFORM_VER)/arch-arm/usr/lib
INCLUDE := $(ANDROID_NDK_ROOT)/platforms/android-$(NDK_PLATFORM_VER)/arch-arm/usr/include
CC := $(BIN)/arm-eabi-gcc
GDB_CLIENT := $(BIN)/arm-eabi-gdb
LIBCRT := $(LIB)/crtbegin_dynamic.o
LINKER := /system/bin/linker
DEBUG := -g
CFLAGS := $(DEBUG) -fno-short-enums -I$(INCLUDE)
CFLAGS += -Wl,-rpath-link=$(LIB),-dynamic-linker=$(LINKER) -L$(LIB)
CFLAGS += -nostdlib -lc
all: $(APP)
$(APP): $(APP).c
$(CC) -o [email protected] $< $(CFLAGS) $(LIBCRT)
install: $(APP)
$(ANDROID_SDK_ROOT)/platform-tools/adb push $(APP) $(INSTALL_DIR)/$(APP)
$(ANDROID_SDK_ROOT)/platform-tools/adb shell chmod 777 $(INSTALL_DIR)/$(APP)
shell:
$(ANDROID_SDK_ROOT)/platform-tools/adb shell
run:
$(ANDROID_SDK_ROOT)/platform-tools/adb shell $(INSTALL_DIR)/$(APP)
debug-install:
$(ANDROID_SDK_ROOT)/platform-tools/adb push $(PREBUILD)/../gdbserver $(INSTALL_DIR)/gdbserver
$(ANDROID_SDK_ROOT)/platform-tools/adb shell chmod 777 $(INSTALL_DIR)/gdbserver
debug-go:
$(ANDROID_SDK_ROOT)/platform-tools/adb forward tcp:1234: tcp:1234
$(ANDROID_SDK_ROOT)/platform-tools/adb shell $(INSTALL_DIR)/gdbserver :1234 $(INSTALL_DIR)/$(APP)
debug:
$(GDB_CLIENT) $(APP)
clean:
@rm -f $(APP).o $(APP)
Der Autor speicherte diese Dateien auf seinem/ihrem lokalen Linux-Computer unter:
/home/dd/android/dev/native/test.c
/home/dd/android/dev/native/Makefile
Der Autor hat es dann kompiliert und getestet mit:
[email protected]:~/android/dev/native$ make clean; make; make install; make run
/home/dd/android/android-ndk-r5/toolchains/arm-eabi-4.4.0/prebuilt/linux-x86/bin//arm-eabi-gcc -c -fno-short-enums -I/home/dd/android/android-ndk-r5/platforms/android-9/arch-arm/usr/include test.c -o test.o
/home/dd/android/android-ndk-r5/toolchains/arm-eabi-4.4.0/prebuilt/linux-x86/bin//arm-eabi-g++ -Wl,--entry=main,-dynamic-linker=/system/bin/linker,-rpath-link=/home/dd/android/android-ndk-r5/platforms/android-9/arch-arm/usr/lib -L/home/dd/android/android-ndk-r5/platforms/android-9/arch-arm/usr/lib -nostdlib -lc -o test test.o
/home/dd/android/android-sdk-linux_86/platform-tools/adb push test /data/tmp/test
45 KB/s (2545 bytes in 0.054s)
/home/dd/android/android-sdk-linux_86/platform-tools/adb shell chmod 777 /data/tmp/test
/home/dd/android/android-sdk-linux_86/platform-tools/adb shell /data/tmp/test
Hello, world (i=3)!
Verwendetes SDK und NDK waren:
source code: /home/dd/android/dev/native
android ndk: /home/dd/android/android-ndk-r5
android sdk: /home/dd/android/android-sdk-linux_86
Der Debug-Leitfaden war jedoch der wirklich gute Teil! Kopieren und einfügen ...
Stellen Sie die Kompilierung ein, um das Debugging zu aktivieren:
DEBUG = -g
CFLAGS := $(DEBUG) -fno-short-enums -I$(ANDROID_NDK_ROOT)/platforms/android-$(NDK_PLATFORM_VER)/arch-arm/usr/include
Kopieren Sie die gdbserver-Datei ($(PREBUILD)/../gdbserver) in den Emulator, fügen Sie das Ziel im Makefile hinzu, um es einfach zu machen:
debug-install:
$(ANDROID_SDK_ROOT)/platform-tools/adb push $(PREBUILD)/../gdbserver $(INSTALL_DIR)/gdbserver
$(ANDROID_SDK_ROOT)/platform-tools/adb shell chmod 777 $(INSTALL_DIR)/gdbserver
Jetzt werden wir es auf Port 1234 debuggen:
debug-go:
$(ANDROID_SDK_ROOT)/platform-tools/adb forward tcp:1234: tcp:1234
$(ANDROID_SDK_ROOT)/platform-tools/adb shell $(INSTALL_DIR)/gdbserver :1234 $(INSTALL_DIR)/$(APP)
Führen Sie es dann aus:
[email protected]:~/android/dev/native$ make clean; make; make install; make debug-install; make debug-go
/home/dd/android/android-ndk-r5/toolchains/arm-eabi-4.4.0/prebuilt/linux-x86/bin//arm-eabi-gcc -c -g -fno-short-enums -I/home/dd/android/android-ndk-r5/platforms/android-9/arch-arm/usr/include test.c -o test.o
/home/dd/android/android-ndk-r5/toolchains/arm-eabi-4.4.0/prebuilt/linux-x86/bin//arm-eabi-g++ -Wl,--entry=main,-dynamic-linker=/system/bin/linker,-rpath-link=/home/dd/android/android-ndk-r5/platforms/android-9/arch-arm/usr/lib -L/home/dd/android/android-ndk-r5/platforms/android-9/arch-arm/usr/lib -nostdlib -lc -o test test.o
/home/dd/android/android-sdk-linux_86/platform-tools/adb push test /data/tmp/test
71 KB/s (3761 bytes in 0.051s)
/home/dd/android/android-sdk-linux_86/platform-tools/adb shell chmod 777 /data/tmp/test
/home/dd/android/android-sdk-linux_86/platform-tools/adb push /home/dd/android/android-ndk-r5/toolchains/arm-eabi-4.4.0/prebuilt/linux-x86/../gdbserver /data/tmp/gdbserver
895 KB/s (118600 bytes in 0.129s)
/home/dd/android/android-sdk-linux_86/platform-tools/adb shell chmod 777 /data/tmp/gdbserver
/home/dd/android/android-sdk-linux_86/platform-tools/adb forward tcp:1234: tcp:1234
/home/dd/android/android-sdk-linux_86/platform-tools/adb shell /data/tmp/gdbserver :1234 /data/tmp/test
Process /data/tmp/test created; pid = 472
Listening on port 1234
Öffnen Sie nun eine andere Konsole und führen Sie den Debugger aus:
[email protected]:~/android/dev/native$ make debug
/home/dd/android/android-ndk-r5/toolchains/arm-eabi-4.4.0/prebuilt/linux-x86/bin//arm-eabi-gdb test
GNU gdb 6.6
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "--host=x86_64-linux-gnu --target=arm-elf-linux"...
(gdb) target remote :1234
Remote debugging using :1234
warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.
0xb0001000 in ?? ()
(gdb) b main
Breakpoint 1 at 0x82fc: file test.c, line 6.
(gdb) c
Continuing.
Error while mapping shared library sections:
/system/bin/linker: No such file or directory.
Error while mapping shared library sections:
libc.so: Success.
Breakpoint 1, main (argc=33512, argv=0x0) at test.c:6
6 int i = 1;
(gdb) n
7 i+=2;
(gdb) p i
$1 = 1
(gdb) n
9 printf("Hello, world (i=%d)!\n", i);
(gdb) p i
$2 = 3
(gdb) c
Continuing.
Program exited normally.
(gdb) quit
Nun, es ist in Ordnung. Und die andere Konsole gibt zusätzliche Ausgaben wie folgt aus:
Remote debugging from host 127.0.0.1
gdb: Unable to get location for thread creation breakpoint: requested event is not supported
Hello, world (i=3)!
Child exited with retcode = 0
Child exited with status 0
GDBserver exiting
Hier ist ein Beispielprojekt, das der Antwort von KennyTM folgt. Sie können es von Grund auf neu erstellen oder ein anderes Projekt ändern, z. B. hello-jni
in den NDK-Beispielen.
jni/main.c:
#include <stdio.h>
int main() {
printf("hello\n");
return 0;
}
jni/Application.mk:
#APP_ABI := all
APP_ABI := armeabi-v7a
jni/Android.mk:
LOCAL_PATH := $(call my-dir)
# first target: the hello-jni example
# it shows how to build multiple targets
# {{ you may comment it out
include $(CLEAR_VARS)
LOCAL_MODULE := hello-jni
LOCAL_SRC_FILES := hello-jni.c
LOCAL_LDLIBS := -llog -L$(LOCAL_PATH)/lib -lmystuff # link to libmystuff.so
include $(BUILD_SHARED_LIBRARY)
#}} you may comment it out
# second target
include $(CLEAR_VARS)
LOCAL_MODULE := hello
LOCAL_SRC_FILES := main.c
include $(BUILD_EXECUTABLE) # <-- Use this to build an executable.
Ich muss beachten, dass Sie keine Protokollierung in der stdout-Ausgabe sehen werden, Sie müssen adb logcat
verwenden um es zu sehen.
Wenn Sie also protokollieren möchten:
jni/main.c:
#include <stdio.h>
#include <android/log.h>
int main() {
printf("hello\n");
__android_log_print(ANDROID_LOG_DEBUG , "~~~~~~", "log %i", 0); // the 3rd arg is a printf-style format string
return 0;
}
und der entsprechende Abschnitt in jni/Android.mk wird zu:
LOCAL_PATH := $(call my-dir)
#...
include $(CLEAR_VARS)
LOCAL_MODULE := hello
LOCAL_SRC_FILES := main.c
LOCAL_LDLIBS := -llog # no need to specify path for liblog.so
include $(BUILD_EXECUTABLE) # <-- Use this to build an executable.