Android构建共享库

Question

我是NDK的新手，我想在我的应用程序中使用c库。我尝试使用一个简单的c文件，它可以工作。我成功地在这两个api之间发送和接收数据。但是，当我想介绍一个现有的c库时，当我运行ndk-build时，我会遇到这样的错误。

root@xxx:~/workspace/Myproject# ndk-build
Android NDK: WARNING: APP_PLATFORM android-16 is larger than android:minSdkVersion 8 in /root/workspace/MyOpus/AndroidManifest.xml    
[armeabi-v7a] Compile thumb  : my_manager <= myencoder.c
[armeabi-v7a] SharedLibrary  : libmy_manager.so
/usr/local/mes_installations/android_tool/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: error: ./obj/local/armeabi-v7a/libopus.so: incompatible target
/usr/local/mes_installations/android_tool/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi-v7a/objs/my_manager/src/myencoder.o: in function myEncodeOpus:/root/workspace/MyOpus/jni/src/myencoder.c:81: error: undefined reference to 'opus_encoder_create'
/usr/local/mes_installations/android_tool/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi-v7a/objs/my_manager/src/myencoder.o: in function myEncodeOpus:/root/workspace/MyOpus/jni/src/myencoder.c:84: error: undefined reference to 'opus_strerror'
/usr/local/mes_installations/android_tool/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi-v7a/objs/my_manager/src/myencoder.o: in function myEncodeOpus:/root/workspace/MyOpus/jni/src/myencoder.c:93: error: undefined reference to 'opus_encoder_ctl'
/usr/local/mes_installations/android_tool/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi-v7a/objs/my_manager/src/myencoder.o: in function myEncodeOpus:/root/workspace/MyOpus/jni/src/myencoder.c:96: error: undefined reference to 'opus_strerror'
/usr/local/mes_installations/android_tool/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi-v7a/objs/my_manager/src/myencoder.o: in function myEncodeOpus:/root/workspace/MyOpus/jni/src/myencoder.c:120: error: undefined reference to 'opus_encode'
/usr/local/mes_installations/android_tool/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi-v7a/objs/my_manager/src/myencoder.o: in function myEncodeOpus:/root/workspace/MyOpus/jni/src/myencoder.c:123: error: undefined reference to 'opus_strerror'
collect2: ld returned 1 exit status
make: *** [obj/local/armeabi-v7a/libmy_manager.so] Error 1

我该如何解决这个问题？我阅读了所有的Android.mk文档，但我没有看到任何需要解决的问题。问候

Answer 1

您说您成功地创建了共享库libmy_manager。在Android.mk中指定libmy_manager.so的路径和头文件的路径

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := libmy_manager
LOCAL_SRC_FILES := libmy_manager.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include  #path of header file with define               
                                                  # function in libmy_manager
include $(PREBUILT_SHARED_LIBRARY)


include $(CLEAR_VARS)
LOCAL_MODULE    := my_manager
LOCAL_SRC_FILES := my_manager.c
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
LOCAL_SHARED_LIBRARIES := libmy_manager
include $(BUILD_SHARED_LIBRARY)