android ndk開發 missing and no know n rule to make it

在進行視頻工具開發的時候，遇到了下方的錯誤，這個問題網上的解決方式我都試過了，卻不適用我。

網上的解釋都是路徑配錯了，經仔細查看後，包括查看CMakeLists.txt文件，都沒有發現什麼異常。

 

項目文件包如下:

Cmake.txt配置如下：

# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html

# Sets the minimum version of CMake required to build the native library.

cmake_minimum_required(VERSION 3.4.1)

set(NATIVE_LIBS ${CMAKE_SOURCE_DIR}/libs)

add_library(mp4v2
        SHARED
        IMPORTED)
set_target_properties(mp4v2
        PROPERTIES
        IMPORTED_LOCATION
        ${NATIVE_LIBS}/${ANDROID_ABI}/libmp4v2.so)
include_directories(libs/include)

# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.

add_library( # Sets the name of the library.
        native-lib
        # Sets the library as a shared library.
        SHARED
        # Provides a relative path to your source file(s).
        src/main/cpp/native-lib.cpp
        src/main/cpp/MP4Encoder.cpp
        src/main/cpp/MP4EncoderHelper.cpp)

# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.

find_library( # Sets the name of the path variable.
        log-lib
        # Specifies the name of the NDK library that
        # you want CMake to locate.
        log)

# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.

target_link_libraries( # Specifies the target library.
        native-lib
        mp4v2
        # Links the target library to the log library
        # included in the NDK.
        ${log-lib})

解決辦法：

依據libs裏面的so庫添加ndk配置

ndk {
    abiFilters "arm64-v8a","armeabi-v7a","x86","x86_64"
}

android {
    compileSdkVersion 28
    buildToolsVersion '28.0.3'
    defaultConfig {
        applicationId "com.ttxs.mp4tracfator"
        minSdkVersion 18
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        externalNativeBuild {
            cmake {
                cppFlags "-std=c++11 -frtti -fexceptions"
            }
        }
        ndk {
            abiFilters "arm64-v8a","armeabi-v7a","x86","x86_64"
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    sourceSets {
        main {
            jniLibs.srcDir 'libs'
        }
    }
    externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }
}