博客

1.环境搭建

1.Android Studio中下载如下图的三个tools



2.配置ndk环境变量，path中添加ndk的路径





3.命令行输入ndk-build,出现如下图输出，代表环境变量配置成功



4.Android Studio中新建native方法并导入链接库文件



5.打开Android studio自带终端，进入项目app\src\main\java目录，执行：


javah -jni -d …/jni com.example.myapplication.MainActivity

生成对应.h文件





6…h文件只是定义了方法，还需要创建对应c文件对该方法进行实现



7.创建Android.mk和Application.mk

LOCAL_PATH :=$(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE :=hello
LOCAL_SRC_FILES :=com_example_app7_MainActivity.cpp
include $(BUILD_SHARED_LIBRARY)

APP_MODULES :=hello
APP_ABI :=all

8.还需要在build.gradle和gradle.properties添加:

android {
    compileSdkVersion 29
    defaultConfig {
        applicationId "com.tct.jniapplication"
        minSdkVersion 15
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        ndk{
            moduleName "hello"
            abiFilters "armeabi-v7a"
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
        externalNativeBuild {
            ndkBuild {
                path 'src/main/jni/Android.mk'
            }
        }
        sourceSets.main {
            jni.srcDirs = []
            jniLibs.srcDirs = ['src/main/jni']
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}

9.最后在jni目录下执行命令编译so库：ndk-build





以上是编译成功

然后把apk安装到设备即可，log中打印”Hello Jni”，第一个ndk程序调试成功