安卓逆向十一

plugins {    id 'com.android.application'}android {    compileSdkVersion 30    buildToolsVersion '30.0.0'    defaultConfig {        applicationId "包名"        minSdkVersion 16        targetSdkVersion 30        versionCode 1        versionName "1.0"        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"        ndk {            abiFilters "armeabi-v7a", "arm64-v8a", "x86", "x86_64"        }        externalNativeBuild {            cmake {                cppFlags ""            }        }    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'        }    }    externalNativeBuild {        cmake {            path "src/main/cpp/CMakeLists.txt"            version "3.10.2"        }    }    compileOptions {        sourceCompatibility JavaVersion.VERSION_1_8        targetCompatibility JavaVersion.VERSION_1_8    }}dependencies {    implementation 'androidx.appcompat:appcompat:1.3.0'    implementation 'com.google.android.material:material:1.4.0'    implementation 'androidx.annotation:annotation:1.1.0'    implementation 'androidx.constraintlayout:constraintlayout:2.1.0'//    implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.2.0'//    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0'    testImplementation 'junit:junit:4.+'    androidTestImplementation 'androidx.test.ext:junit:1.1.3'    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.1'}

对相关源码进行注释解析：// 指定使用C链接方式，防止C++编译器对函数名进行名称重整extern "C" JNIEXPORT jstring JNICALL// 定义一个JNI函数，Java_com_XXX_myapplication6_MainActivity_stringFromJNI// 这个函数名由包名、类名和方法名组合而成Java_com_XXX_myapplication6_MainActivity_stringFromJNI(// JNIEnv是JNI的接口指针，通过它可以访问JNI提供的所有功能JNIEnv* env,// jobject是调用这个本地方法的Java对象引用jobject /* this */) {// 定义一个C++标准字符串，并赋值为 "Hello from C++ by myself"std::string hello = "Hello from C++ by myself";// 使用JNIEnv指针的NewStringUTF方法将C++字符串转换为JNI的jstring类型并返回// hello.c_str() 返回一个C字符串（以null结尾的字符数组）的指针return env->NewStringUTF(hello.c_str());}