How to call a third-party library file (. so) in Android NDK ).

I suffered a loss when calling third-party so files in the C ++ code of Android NDK for the first time. put the so file in the libs/armeabi directory. If you did not expect an ndk-build, the so file will be deleted and a link error will be reported. it is found that NDK is called. so needs to be PREBUILT processing, the steps are as follows:

1. Create a prebuilt subdirectory under the project/jni directory (the directory name can be customized). 2. Put the third-party. so in prebuilt and create Android. mk. The content is as follows:

LOCAL_PATH: = $ (call my-dir)

Include $ (CLEAR_VARS)

LOCAL_MODULE: = xxx

LOCAL_SRC_FILES: = libxxx. so

Include $ (PREBUILT_SHARED_LIBRARY)

3. Add the following content to project/jni/Android. mk:

LOCAL_SHARED_LIBRARIES: = xxx

4. Add it at the end of project/jni/android. mk

Include $ (LOCAL_PATH)/prebuilt/Android. mk

5. Run cygwin and run $ NDK/ndk-build static library reference under the project directory.

Two days ago, I wanted to use jni to call some ready-made code. So I used NDK to compile the project. The Android. mk file is as follows:

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1. LOCAL_PATH: =$ (CallMy-dir) 
2.   
3. Include$ (CLEAR_VARS)  
4.   
5. LOCAL_MODULE   : =My_jni 
6. LOCAL_SRC_FILES: =My_jni.c 
7.   
8.   
9. LOCAL_STATIC_LIBRARIES: =Libstatic 
10.   
11. LOCAL_LDLIBS: =-Llog  
12.   
13. Include$ (BUILD_SHARED_LIBRARY) 

Libstatic. a is the third-party static library that I want to call.

However, if a problem occurs, the system prompts that the function in the static library cannot be found, as shown below:

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1. D:/WJR-WorkPlace/WorkSpace/Android/jni/my_jni.c: 172:UndefinedReferenceTo'_ Destroy' 

_ Destroy is a function provided by a third-party static library.

I found a lot of information and failed to solve the problem. I finally solved the problem with the help of my colleagues because the static library link is incorrect and I changed android. mk

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1. LOCAL_PATH: =$ (CallMy-dir) 
2.   
3. Include$ (CLEAR_VARS)  
4. LOCAL_MODULE   : =Static 
5. LOCAL_SRC_FILES: =Libstatic.  
6. Include$ (PREBUILT_STATIC_LIBRARY) 
7.   
8. Include$ (CLEAR_VARS)  
9.   
10. LOCAL_MODULE   : =My_jni 
11. LOCAL_SRC_FILES: =My_jni.c 
12.   
13. Local_static_libraries: =Static 
    
14.   
15. Local_ldlibs: =-Llog  
16.   
17. Include$ (Build_shared_library)