使用C++和NativeActivity类获取Android APK的名称

#include <jni.h>
#include<string>

extern "C" JNIEXPORT void JNICALL
Java_com_example_myapplication_MainActivity_getApkName(JNIEnv *env, jobject instance, jobject context) {
    // 获取Java类的实例
    jclass contextClass = (*env)->FindClass(env, "android/content/Context");
    jclass packageManagerClass = (*env)->FindClass(env, "android/content/pm/PackageManager");

    // 获取Java类的方法ID
    jmethodID getPackageManagerMethod = (*env)->GetMethodID(env, contextClass, "getPackageManager", "()Landroid/content/pm/PackageManager;");
    jmethodID getPackageNameMethod = (*env)->GetMethodID(env, contextClass, "getPackageName", "()Ljava/lang/String;");
    jmethodID getApplicationInfoMethod = (*env)->GetMethodID(env, packageManagerClass, "getApplicationInfo", "(Ljava/lang/String;I)Landroid/content/pm/ApplicationInfo;");
    jmethodID getApplicationLabelMethod = (*env)->GetMethodID(env, packageManagerClass, "getApplicationLabel", "(Landroid/content/pm/ApplicationInfo;)Ljava/lang/CharSequence;");

    // 调用Java类的方法
    jobject packageManager = (*env)->CallObjectMethod(env, context, getPackageManagerMethod);
    jstring packageName = (jstring)(*env)->CallObjectMethod(env, context, getPackageNameMethod);
    jobject applicationInfo = (*env)->CallObjectMethod(env, packageManager, getApplicationInfoMethod, packageName, 0);
    jobject applicationLabel = (*env)->CallObjectMethod(env, packageManager, getApplicationLabelMethod, applicationInfo);

    // 将返回值转换为C++字符串
    const char* label = (*env)->GetStringUTFChars(env, (jstring)applicationLabel, NULL);
    std::string apkName(label);

    // 释放资源
    (*env)->ReleaseStringUTFChars(env, (jstring)applicationLabel, label);
}