Question

我使用ndk-build构建一个静态库并成功编译成* .so，但在android模拟器中运行时会抛出运行时错误。错误是

E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: org.example.kotlin.mixed, PID: 31185
                  java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "_ZNSt6__ndk17codecvtIcc9mbstate_tE2idE" referenced by "/data/app/org.example.kotlin.mixed-2/lib/x86/libtest.so"...
                      at java.lang.Runtime.loadLibrary(Runtime.java:372)
                      at java.lang.System.loadLibrary(System.java:1076)
                      at com.bytedance.lark.sdk.Sdk.<init>(Sdk.kt:15)
                      at org.example.kotlin.mixed.MyApplication.onCreate(MyApplication.kt:12)
                      at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1013)
                      at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4707)
                      at android.app.ActivityThread.-wrap1(ActivityThread.java)
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405)
                      at android.os.Handler.dispatchMessage(Handler.java:102)
                      at android.os.Looper.loop(Looper.java:148)
                      at android.app.ActivityThread.main(ActivityThread.java:5417)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

我发现符号_ZNSt6__ndk17codecvtIcc9mbstate_tE2idE出现在我构建的静态库中。我在源代码中找不到ndk的引用。我不确定ndk-build是否将此符号添加到静态库。

ndk-build配置就在这里。

Application.mk

APP_ABI := x86

APP_PLATFORM := android-21 // I change this to android-14, also not work
APP_STL:=c++_static
APP_CPPFLAGS:=-std=c++11 -fexceptions -frtti  -DANDROID -DDEBUG

NDK_TOOLCHAIN_VERSION := clang

Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

include ../uuid/Android.mk
include mylib.mk

mylib.mk

LOCAL_PATH := $(call my-dir)

MYLIB_CSOURCES := \
  // my source code

MYLIB_INCLUDES := \
  $(LOCAL_PATH)/../uuid/include \
  $(LOCAL_PATH)/../../../../../lib/rapidjson/include \
  $(LOCAL_PATH)/../../../../../src

###
### Build mylib.a
###

include $(CLEAR_VARS)

LOCAL_MODULE := mylibc++

LOCAL_SRC_FILES := \
    $(addprefix ../../../../../src/,$(MYLIB_CSOURCES))

LOCAL_C_INCLUDES := $(MYLIB_INCLUDES)

LOCAL_CFLAGS += -DANDROID -DDEBUG -D__ANDROID__

LOCAL_WHOLE_STATIC_LIBRARIES := uuid

include $(BUILD_STATIC_LIBRARY)

android build config：

android {
    compileSdkVersion 23
    buildToolsVersion '26.0.2'

    defaultConfig {
        minSdkVersion 14
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    lintOptions {
        abortOnError false
    }
    sourceSets.main {
        jni.srcDirs = []
        jniLibs.srcDir 'libs'
    }
}

Answer 1

符号 _ZNSt6__ndk17codecvtIcc9mbstate_tE2idE （表示 std :: __ ndk1 :: codecvt :: id ）可在 libc ++ _ shared.so 中找到。

如果运行时环境（模拟器）低于API 21，则必须在加载 libtest.so之前从Java显式加载此库强>

libc ++ _ shared.so 也应与 libtest.so 一起打包到APK中。确保它存在于 libs / x86 中以及其他相关的ABI中。

在Android Studio中，您可以让gradle为您构建NDK库，它将处理必要的依赖项。

java.lang.UnsatisfiedLinkError：dlopen失败：找不到符号“_ZNSt6__ndk17codecvtIcc9mbstate_tE2idE”

1 个答案: