Android的NDK：获取java.lang.UnsatisfiedLinkError中：执行dlopen失败：无法找到符号QUOT;信号QUOT;通过引用＆QUOT; libffmpeg.so＆QUOT; [英] Android NDK : Getting java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "signal" referenced by "libffmpeg.so"
问题描述
我有一个视频剪应用code。
I have a video trimmer application code .
其Android.mk文件code被提到如下：
Its Android.mk file code is mentioned below:
MY_LOCAL_PATH := $(call my-dir)
包含$（所有子目录，makefile文件）
include $(all-subdir-makefiles)
LOCAL_PATH :=$(MY_LOCAL_PATH)
include $(CLEAR_VARS)
LOCAL_MODULE := video-trimmer
LOCAL_SRC_FILES := video-trimmer.c
LOCAL_C_INCLUDES := $(MY_LOCAL_PATH) $(MY_LOCAL_PATH)/ffmpeg
LOCAL_SHARED_LIBRARIES := ffmpeg
LOCAL_LDLIBS += -lz -llog
include $(BUILD_SHARED_LIBRARY)
和Application.mk文件code是：
and Application.mk file code is :
APP_MODULES := ffmpeg video-trimmer
APP_OPTIM := debug
当我尝试运行该应用程序，我收到以下错误：
When I try to run this application, I get following error :
02-26 16:06:05.779: E/AndroidRuntime(4092): FATAL EXCEPTION: main
02-26 16:06:05.779: E/AndroidRuntime(4092): Process: net.video.trimmer, PID: 4092
02-26 16:06:05.779: E/AndroidRuntime(4092): java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "signal" referenced by "libffmpeg.so"...
02-26 16:06:05.779: E/AndroidRuntime(4092): at java.lang.Runtime.loadLibrary(Runtime.java:364)
02-26 16:06:05.779: E/AndroidRuntime(4092): at java.lang.System.loadLibrary(System.java:526)
02-26 16:06:05.779: E/AndroidRuntime(4092): at net.video.trimmer.service.VideoTrimmingService.onCreate(VideoTrimmingService.java:29)
02-26 16:06:05.779: E/AndroidRuntime(4092): at android.app.ActivityThread.handleCreateService(ActivityThread.java:2585)
02-26 16:06:05.779: E/AndroidRuntime(4092): at android.app.ActivityThread.access$1800(ActivityThread.java:139)
02-26 16:06:05.779: E/AndroidRuntime(4092): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292)
02-26 16:06:05.779: E/AndroidRuntime(4092): at android.os.Handler.dispatchMessage(Handler.java:102)
02-26 16:06:05.779: E/AndroidRuntime(4092): at android.os.Looper.loop(Looper.java:136)
02-26 16:06:05.779: E/AndroidRuntime(4092): at android.app.ActivityThread.main(ActivityThread.java:5086)
02-26 16:06:05.779: E/AndroidRuntime(4092): at java.lang.reflect.Method.invokeNative(Native Method)
02-26 16:06:05.779: E/AndroidRuntime(4092): at java.lang.reflect.Method.invoke(Method.java:515)
02-26 16:06:05.779: E/AndroidRuntime(4092): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
02-26 16:06:05.779: E/AndroidRuntime(4092): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
02-26 16:06:05.779: E/AndroidRuntime(4092): at dalvik.system.NativeStart.main(Native Method)
我video-trimmer.so和ffmpeg.so在生成\\库\\ armeabi 。
先谢谢了。
推荐答案
信号是一个内联函数，直到平台的android-21，现在是不是内联了。
signal was an inline function until platform android-21, now it's not inline anymore.
当您使用NDK R10，Android为21默认使用的，但它不是完全与运行前的Android版本的设备复古兼容。你的情况，信号不能被您的设备上（但它会棒棒糖上正常运行）找到。
When you use the ndk r10, android-21 is used by default but it's not fully retro-compatible with devices running former Android versions. In your case, signal can't be found on your device (but it would run properly on Lollipop).
在使用NDK，你应该使用平台（ APP_PLATFORM：= Android的XX ）对应于您的安卓的minSdkVersion 。
When using the NDK, you should use the platform (APP_PLATFORM:=android-XX) that corresponds to your android:minSdkVersion.
所以在这里你可以设置 APP_PLATFORM：=机器人-15 里面的 Application.mk 的Makefile文件，你的LIB将使用信号线版本，所以不会寻找其在运行时的象征。
So here you can set APP_PLATFORM:=android-15 inside Application.mk Makefile, and your lib will use the inline version of signal, so it will not look for its symbol at runtime.
这篇关于Android的NDK：获取java.lang.UnsatisfiedLinkError中：执行dlopen失败：无法找到符号QUOT;信号QUOT;通过引用＆QUOT; libffmpeg.so＆QUOT;的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
