How-to use a shared library in native-activity

问题

I have an Android project with a native activity. This native activity uses a shared library named "main" (libmain.so file) for starting. ( with the code of ndk/samples/native-activity )

This app works fine.

the "main" module Android.mk file :

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE    := main
LOCAL_SRC_FILES := main.cpp

LOCAL_LDLIBS := -llog -landroid -lEGL -lGLESv1_CM

LOCAL_STATIC_LIBRARIES := android_native_app_glue game

include $(BUILD_SHARED_LIBRARY)

$(call import-module,android/native_app_glue)

Now I want to add another shared library (for example a game engine) used by "main" library. I have built a "game" module (libgame.so).

But when I link the "main" with the "game", like this :

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE    := main
LOCAL_SRC_FILES := main.cpp

LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../../game

LOCAL_LDLIBS := -llog -landroid -lEGL -lGLESv1_CM
LOCAL_LDLIBS += $(LOCAL_PATH)/../../libs/$(TARGET_ARCH_ABI)/libgame.so

LOCAL_STATIC_LIBRARIES := android_native_app_glue game

include $(BUILD_SHARED_LIBRARY)

$(call import-module,android/native_app_glue)

with code no changes !
the app doesn't start anymore and I have this error in Logcat :

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mycompany.myproject/android.app.NativeActivity}: java.lang.IllegalArgumentException: Unable to load native library: /data/data/com.mycompany.myproject/lib/libmain.so

This crash is due to adding link to a shared library ...

Why linking to a shared library make the app not loading (crash) ?
How can I use a shared library in a native android project (no-java / native-activity) ?
(I suppose it can be possible ... otherwise the native activity is quite limited ...)

Thanks ! :)

回答1:

I believe you must list all your shared libraries in AndroidManifest.xml file:

<meta-data android:name="android.app.lib_name" android:value="game" />
<meta-data android:name="android.app.lib_name" android:value="main" />

Not sure about the order of libraries. Try change the order if it doesn't work.

来源：https://stackoverflow.com/questions/9111107/how-to-use-a-shared-library-in-native-activity

标签

android

android-ndk

shared-libraries

native-activity