autojs调用C

// 1. 加载so文件
// 2. 声明本地方法
package com.yashu.usec;
public class Student {
    static {
        System.loadLibrary("soname");
    }
    public static native int doMathSum(int a,int b);
}

cd到路径 app/src/main/java
输入命令 javah -jni com.yashu.usec.Student
会生成头文件 app/src/main/java/com_yashu_usec_Student.h

// 路径: app/src/main/jni/xiaoqiang.c
#include "com_yashu_usec_Student.h"
JNIEXPORT jint JNICALL Java_com_yashu_usec_Student_doMathSum (JNIEnv * env, jclass obj, jint a, jint b){
    return a+b;
  }

// 路径 app/src/main/jni/Android.mk
   LOCAL_PATH := $(call my-dir)
   include $(CLEAR_VARS)
   LOCAL_MODULE := soname
   LOCAL_SRC_FILES := xiaoqiang.c
   include $(BUILD_SHARED_LIBRARY)

// 路径 app/src/main/jni/Application.mk
   APP_PLATFORM := android-26
   APP_ALLOW_MISSING_DEPS=true
   APP_ABI := arm64-v8a, armeabi-v7a, x86, x86_64

cd到路径 app/src/main/jni
命令行中输入 ndk-build
生成的so所在文件夹 app/src/main/libs

// 1. app的build.gradle中添加ndk配置
android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"
    externalNativeBuild {
        ndkBuild {
            // Provides a relative path to your ndkBuild script.
            path file("src/main/jni/Android.mk")
        }
    }
    defaultConfig {
    ...
    }
}

2. 点击菜单build/make project

3. 提取dex, 路径为
app\build\intermediates\dex\debug\mergeProjectDexDebug\classes.dex

4. 提取so, 我的手机是armeabi-v7a

5. 剩下的要在autojs测试

// 复制so文件到指定目录, 不需要runtime.loadDex
let soPath = "/sdcard/Android/data/com.tencent.mobileqq/Tencent/QQfile_recv/libsoname777.so";
let dexPath = "/sdcard/Android/data/com.tencent.mobileqq/Tencent/QQfile_recv/classes777.dex";
var ctx = context;
var cwd = files.cwd();
var jniPath = ctx.getDir("libs", android.app.Activity.MODE_PRIVATE);
log("jniPath = " + jniPath);
var dirpath = ctx.getDir("dex", android.app.Activity.MODE_PRIVATE).getAbsolutePath();
log("dirpath = " + dirpath);
copy(soPath, new java.io.File(jniPath, "libsoname.so").getAbsolutePath());
var dcl = new Packages.dalvik.system.DexClassLoader(
  dexPath,
  dirpath,
  jniPath,
  java.lang.ClassLoader.getSystemClassLoader()
);
var cls = dcl.loadClass("com.yashu.usec.Student");
var api = cls.newInstance();
let result = api.doMathSum(1, 2);
log(result);
function copy(f, t) {
  var fip = new java.io.FileInputStream(f).getChannel();
  var fop = new java.io.FileOutputStream(t).getChannel();
  fip.transferTo(0, fip.size(), fop);
  fip.close();
  fop.close();
}

let r = android.os.Build.CPU_ABI;
log(r); // armeabi-v7a
let abis = android.os.Build.SUPPORTED_ABIS;
log(abis); // [arm64-v8a, armeabi-v7a, armeabi]