引入第三方so库

1.生成so库

2.把生成的so库复制到项目libs目录文件夹

3.修改项目build.gradle文件

android {    compileSdkVersion 26    buildToolsVersion "26.0.1"    defaultConfig {        applicationId "com.example.administrator.aslibtest1"        minSdkVersion 15        targetSdkVersion 26        versionCode 1        versionName "1.0"        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"        externalNativeBuild {            cmake {                cppFlags "-frtti -fexceptions"            }        }        //如果需要指定开发平台 如:        /*ndk {            abiFilters "armeabi","x86"        }*/    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }    externalNativeBuild {        cmake {            path "CMakeLists.txt"        }    }    // 引入第三方库，在app.gralde中的android目录下    sourceSets.main {        jniLibs.srcDirs = ['libs']        jni.srcDirs = []    }}

4.修改CMakeLists.txt

# 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)find_library( # Sets the name of the path variable.              log-lib              log )#设置so库路径set(my_lib_path ${CMAKE_SOURCE_DIR}/libs)#讲第三方库作为动态库引用add_library( native-lib          SHARED          IMPORTED )#指名第三方库的绝对路径set_target_properties( native-lib                    PROPERTIES IMPORTED_LOCATION                    ${my_lib_path}/${ANDROID_ABI}/libnative-lib.so )add_library( # Sets the name of the library.            libTest            SHARED            src/main/cpp/native-lib.c )target_link_libraries( # Specifies the target library.                      libTest                      native-lib                      ${log-lib} )

5.添加头文件

6.触发JNI调用

public class MainActivity extends AppCompatActivity {    // Used to load the 'native-lib' library on application startup.    static {        System.loadLibrary("native-lib");        System.loadLibrary("libTest");    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // Example of a call to a native method        TextView tv = (TextView) findViewById(R.id.sample_text);        tv.setText(""+stringFromJNI(99,66));//165    }    /**    * A native method that is implemented by the 'native-lib' native library,    * which is packaged with this application.    */    public native int stringFromJNI(int a,int b);}