如何使用 gradle 以编程方式将 libc++_shared.so 包含到我的 APK 中？

Question

在项目中更新：

• Gstreamer 1.14.5 -> Gstreamer 1.18.0

• NDKr16 -> NDKr21.3.6528147

• 构建：gradle:3.5.3 -> build:gradle:4.1.0

• buildToolsVersion 29.0.3

   compileSdk: 29,
   minSdk    : 26,
   targetSdk : 29,
   material  : "1.2.1",
   constraint: "2.0.2",
   ktx       : "1.1.0",
   espresso  : "3.1.0",
   mockito   : "2.9.0",
   junit     : "4.13.1"
  

此更新产生问题：

java.lang.UnsatisfiedLinkError: dlopen failed: library "libc++_shared.so" not found
    at java.lang.Runtime.loadLibrary0(Runtime.java:1071)
    at java.lang.Runtime.loadLibrary0(Runtime.java:1007)
    at java.lang.System.loadLibrary(System.java:1667)
    at com.kbnt.naparnik.client.MainActivity.<clinit>(MainActivity.java:103)
    at java.lang.Class.newInstance(Native Method) 
...

项目构建正确，但是当我 运行 应用程序崩溃时出现问题

Android.mk 文件:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := client
LOCAL_SRC_FILES := client.c
LOCAL_SHARED_LIBRARIES := gstreamer_android
LOCAL_LDLIBS := -llog -landroid
include $(BUILD_SHARED_LIBRARY)

ifndef GSTREAMER_ROOT_ANDROID
    $(error GSTREAMER_ROOT_ANDROID is not defined!)
endif
ifeq ($(TARGET_ARCH_ABI),armeabi)
    GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/arm
else ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
    GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/armv7
else ifeq ($(TARGET_ARCH_ABI),arm64-v8a)
    GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/arm64
else ifeq ($(TARGET_ARCH_ABI),x86)
    GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/x86
else ifeq ($(TARGET_ARCH_ABI),x86_64)
    GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/x86_64
else
    #$(error Target arch ABI not supported: $(TARGET_ARCH_ABI))
    GSTREAMER_ROOT        := $(GSTREAMER_ROOT_ANDROID)/armv7
endif

GSTREAMER_NDK_BUILD_PATH  := $(GSTREAMER_ROOT)/share/gst-android/ndk-build/
include $(GSTREAMER_NDK_BUILD_PATH)/plugins.mk

GSTREAMER_PLUGINS         :=  $(GSTREAMER_PLUGINS_CORE)         \
                             $(GSTREAMER_PLUGINS_CODECS)        \
                             $(GSTREAMER_PLUGINS_EFFECTS)       \
                             $(GSTREAMER_PLUGINS_NET)           \
                             $(GSTREAMER_PLUGINS_CAPTURE)       \
                             $(GSTREAMER_PLUGINS_PLAYBACK)      \
                             $(GSTREAMER_PLUGINS_SYS)

GSTREAMER_EXTRA_DEPS      := gstreamer-video-1.0
include $(GSTREAMER_NDK_BUILD_PATH)/gstreamer-1.0.mk

Application.mk 文件:

APP_STL := c++_shared
APP_PLATFORM := android-26

我在文档中找到注释 https://developer.android.com/ndk/guides/cpp-support#c_runtime_libraries:

libc++ is not a system library. If you use libc++_shared.so, it must be included in your APK. If you're building your application with Gradle this is handled automatically.

我知道它构建不正确，因为我的 APK 不包含库

如何使用 gradle 以编程方式将 libc++_shared.so 包含到我的 APK 中？

项目结构

app/build.gradle:

android {
compileSdkVersion versions.compileSdk
defaultConfig {
    ...
    externalNativeBuild {
        ndkBuild {
            if (System.getenv("GSTREAMER_ROOT_ANDROID") == null)
                throw new GradleException("Define GSTREAMER_ROOT_ANDROID environment variable")
            targets "client"
            abiFilters "armeabi-v7a", 'arm64-v8a'
        }
    }
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
externalNativeBuild {
    ndkBuild {
        path 'src/main/jni/Android.mk'
    }
}
ndkVersion '21.3.6528147'
buildToolsVersion '29.0.3'
...

Answer 1

看起来像 targets "client" 问题。尝试完全删除它或指定 NDK_APPLICATION_MK:

...
    externalNativeBuild {
        ndkBuild {
            ...
            targets "client"
            arguments "NDK_APPLICATION_MK:=Application.mk"
            ...
        }
    }
}

...

Answer 2

我重构了 Android.mk GSTREAMER_PLUGINS 字段并添加了 GSTREAMER_EXTRA_LIBS。我用项目中使用的特定插件替换了类别，它解决了我的问题。

...
GSTREAMER_PLUGINS   := coreelements udp rtpmanager rtp opengl playback
GSTREAMER_EXTRA_LIBS    := -liconv
...

类别中的某些插件似乎存在错误

谢谢@NikolayKhilyuk 试图帮助我