包含庫在Android項目中使用的共享對象

Question

我的Android項目正在使用具有本機代碼的Android庫項目，並且我從庫使用的本地函數中獲取UnsatisifiedLinkError。

我已經在我的項目的Android.mk文件中包含了庫使用的這些共享對象，並且它們被正確地複製到Eclipse項目的/libs目錄中，當我構建並出現在目錄的目錄中時跑。找不到的方法應該在libVuforiaTracking.so中。

這是我的Android.mk文件：

LOCAL_PATH := $(call my-dir) 

include $(CLEAR_VARS) 
LOCAL_MODULE := QCAR-prebuilt 
LOCAL_SRC_FILES = ../../VuforiaTracking/libs/$(TARGET_ARCH_ABI)/libQCAR.so 
include $(PREBUILT_SHARED_LIBRARY) 

include $(CLEAR_VARS) 
LOCAL_MODULE := VuforiaTracking-prebuilt 
LOCAL_SRC_FILES = ../../VuforiaTracking/libs/$(TARGET_ARCH_ABI)/libVuforiaTracking.so 
include $(PREBUILT_SHARED_LIBRARY) 

include $(CLEAR_VARS) 

LOCAL_MODULE := MyProject 

# The list of shared libraries *modules* this module depends on at runtime. 
# This is necessary at link time and to embed the corresponding information 
# in the generated file. We reference the prebuilt library defined earlier 
# in this makefile. 
LOCAL_SHARED_LIBRARIES := QCAR-prebuilt VuforiaTracking-prebuilt 

#LOCAL_SRC_FILES := MyProject.cpp 

# By default, ARM target binaries will be generated in 'thumb' mode, where 
# each instruction are 16-bit wide. You can define this variable to 'arm' 
# if you want to force the generation of the module's object files in 
# 'arm' (32-bit instructions) mode 
LOCAL_ARM_MODE := arm 

include $(BUILD_SHARED_LIBRARY) 

而這裏的日誌消息：

12-21 09:53:48.220: E/AndroidRuntime(13086): FATAL EXCEPTION: main 
12-21 09:53:48.220: E/AndroidRuntime(13086): java.lang.UnsatisfiedLinkError: Native method not found: com.qualcomm.QCARSamples.ImageTargets.VuforiaTrackingActivity.getOpenGlEsVersionNative:()I 
12-21 09:53:48.220: E/AndroidRuntime(13086): at com.qualcomm.QCARSamples.ImageTargets.VuforiaTrackingActivity.getOpenGlEsVersionNative(Native Method) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at com.qualcomm.QCARSamples.ImageTargets.VuforiaTrackingActivity.getInitializationFlags(VuforiaTrackingActivity.java:293) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at com.qualcomm.QCARSamples.ImageTargets.VuforiaTrackingActivity.onCreate(VuforiaTrackingActivity.java:282) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at android.app.Activity.performCreate(Activity.java:5191) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at android.app.ActivityThread.access$600(ActivityThread.java:140) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at android.os.Handler.dispatchMessage(Handler.java:99) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at android.os.Looper.loop(Looper.java:137) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at android.app.ActivityThread.main(ActivityThread.java:4898) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at java.lang.reflect.Method.invokeNative(Native Method) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at java.lang.reflect.Method.invoke(Method.java:511) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) 
12-21 09:53:48.220: E/AndroidRuntime(13086): at dalvik.system.NativeStart.main(Native Method) 

是正確的方式包括圖書館依賴的共享對象？

編輯：

我注意到包名說com.qualcomm.QCARSamples.ImageTargets.VuforiaTrackingActivity和我也許應該注意的是，我繼承了圖書館的這項活動在我的項目，所以實際活動的軟件包名稱會有所不同。如果JNI去尋找一個名爲com.qualcomm.QCARSamples.ImageTargets.VuforiaTrackingActivity.getOpenGlEsVersionNative()的方法，而我的子類名爲com.my.package.MyActivity，這會導致任何問題嗎？

Answer 1

問題在於，當本機方法調用VuforiaTracking時，我將使用本機方法的類的名稱更改爲VuforiaTrackingActivity。因此，共享對象實際上是正確加載的，並且無關緊要，我擴展了本地方法名稱所基於的基類。我將方法com.qualcomm.QCARSamples.ImageTargets.VuforiaTracking.openGlEsVersionNative更改爲com.qualcomm.QCARSamples.ImageTargets.VuforiaTrackingActivity.openGlEsVersionNative，並且一切都相應地運行。