关于JNI调用第三方静态库

http://blog.youkuaiyun.com/doveqian/article/details/6931507

关于JNI调用第三方静态库

以前没使用过jni，现在用起来比较复杂了，总是弄的一头雾水，比如现在写得双向翻译：

含有多个第三方库，如何加载进来呢，网上找了很久，发现这样可以做到：

更改：android.mk

[java] view plain copy print ?

1. LOCAL_PATH := $(call my-dir) 
2.  
3. include $(CLEAR_VARS) 
4. LOCAL_MODULE := static 
5. #LOCAL_STATIC_LIBS 
6. LOCAL_SRC_FILES := multran.a 
7. include $(PREBUILT_STATIC_LIBRARY) 
8.  
9. include $(CLEAR_VARS) 
10.  
11. LOCAL_MODULE    := Translate 
12. LOCAL_SRC_FILES := getTransContent.c  
13.                      
14. LOCAL_STATIC_LIBS := static 
15.  
16. LOCAL_LDLIBS := -llog 
17.  
18. include $(BUILD_SHARED_LIBRARY) 

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := static
#LOCAL_STATIC_LIBS
LOCAL_SRC_FILES := multran.a
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE    := Translate
LOCAL_SRC_FILES := getTransContent.c 
					
LOCAL_STATIC_LIBS := static

LOCAL_LDLIBS := -llog

include $(BUILD_SHARED_LIBRARY)

编译提示：

<请注意第三行，多了一次编译>

结果：可以编译，但如何加入多个静态库呢？

继续更改 android.mk

[plain] view plain copy print ?

1. LOCAL_PATH := $(call my-dir) 
2.  
3. include $(CLEAR_VARS) 
4. LOCAL_MODULE := static 
5. #LOCAL_STATIC_LIBS 
6. LOCAL_SRC_FILES := multran.a 
7. LOCAL_SRC_FILES := 2.a 
8. LOCAL_SRC_FILES := 3.a 

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := static
#LOCAL_STATIC_LIBS
LOCAL_SRC_FILES := multran.a
LOCAL_SRC_FILES := 2.a
LOCAL_SRC_FILES := 3.a

[plain] view plain copy print ?

1. include $(PREBUILT_STATIC_LIBRARY) 
2.  
3. include $(CLEAR_VARS) 
4.  
5. LOCAL_MODULE    := Translate 
6. LOCAL_SRC_FILES := getTransContent.c  
7.                      
8. LOCAL_STATIC_LIBS := static 
9.  
10. LOCAL_LDLIBS := -llog 
11.  
12. include $(BUILD_SHARED_LIBRARY) 

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE    := Translate
LOCAL_SRC_FILES := getTransContent.c 
					
LOCAL_STATIC_LIBS := static

LOCAL_LDLIBS := -llog

include $(BUILD_SHARED_LIBRARY)

编译结果 同上

结论：只能编译第一个库，晕了，是不是写错了，

最后改成：

[plain] view plain copy print ?

1. include $(CLEAR_VARS) 
2.  
3. LOCAL_MODULE    := Translate 
4. LOCAL_SRC_FILES := getTransContent.c  
5.  
6. LOCAL_STATIC_LIBS += 1.a 
7. LOCAL_STATIC_LIBS += 2.a 
8. LOCAL_STATIC_LIBS += 3.a 

include $(CLEAR_VARS)

LOCAL_MODULE    := Translate
LOCAL_SRC_FILES := getTransContent.c 

LOCAL_STATIC_LIBS += 1.a
LOCAL_STATIC_LIBS += 2.a
LOCAL_STATIC_LIBS += 3.a

[plain] view plain copy print ?

1. LOCAL_LDLIBS := -llog 
2.  
3. include $(BUILD_SHARED_LIBRARY) 

LOCAL_LDLIBS := -llog

include $(BUILD_SHARED_LIBRARY)

这样就OK拉，全部编译了

写错了  这样编译是通过了，可是在实际运用中，却无法访问静态库中的函数的

查看JNi的sample中，模仿写法如下：

[java] view plain copy print ?

1. include $(CLEAR_VARS)    
2. LOCAL_MODULE    := libA   
3. LOCAL_SRC_FILES := libA.a      
4. include $(PREBUILT_STATIC_LIBRARY) 
5.  
6. include $(CLEAR_VARS)    
7. LOCAL_MODULE    := libB      
8. LOCAL_SRC_FILES := libB.a    
9. include $(PREBUILT_STATIC_LIBRARY) 
10.  
11. include $(CLEAR_VARS)    
12. LOCAL_MODULE    := libC 
13. LOCAL_SRC_FILES := libC.a    
14. include $(PREBUILT_STATIC_LIBRARY) 
15.  
16. include $(CLEAR_VARS)            
17. LOCAL_MODULE    := Test 
18. LOCAL_SRC_FILES := Test.c       
19. LOCAL_STATIC_LIBRARIES := libA libB libC    
20. LOCAL_LDLIBS := -llog 
21. include $(BUILD_SHARED_LIBRARY) 

include $(CLEAR_VARS)   
LOCAL_MODULE    := libA  
LOCAL_SRC_FILES := libA.a     
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)   
LOCAL_MODULE    := libB     
LOCAL_SRC_FILES := libB.a   
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)   
LOCAL_MODULE    := libC
LOCAL_SRC_FILES := libC.a   
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)           
LOCAL_MODULE    := Test
LOCAL_SRC_FILES := Test.c      
LOCAL_STATIC_LIBRARIES := libA libB libC   
LOCAL_LDLIBS := -llog
include $(BUILD_SHARED_LIBRARY)

这次是真的OK 了   呵呵  

android-ndk-r6b\samples\two-libs  没事还是要多看看例子哦