使用纯C++获取安卓设备的IMEI和Mac地址

获取安卓设备的IMEI和Mac地址需要使用Android NDK来编写C++代码，因为IMEI和Mac地址是由操作系统提供的，而操作系统是用Java或者Kotlin编写的。以下是获取IMEI和Mac地址的示例代码：

#include <jni.h>
#include <android/log.h>
#include <string>
#include <sstream>

using namespace std;

extern "C" {

JNIEXPORT jstring JNICALL
Java_com_example_android_deviceinfo_DeviceInfoActivity_getIMEI(JNIEnv *env, jobject instance) {

    jclass clazz = env->FindClass("android/telephony/TelephonyManager");
    jmethodID getIMEIMethod = env->GetMethodID(clazz, "getDeviceId", "()Ljava/lang/String;");

    jobject telephonyManager = env->CallObjectMethod(instance, env->GetMethodID(env->GetObjectClass(instance), "getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;"), env->NewStringUTF("phone"));

    jstring imei = (jstring) env->CallObjectMethod(telephonyManager, getIMEIMethod);
    const char *imeiChars = env->GetStringUTFChars(imei, NULL);

    string result = string(imeiChars);

    env->ReleaseStringUTFChars(imei, imeiChars);

    return env->NewStringUTF(result.c_str());
}

JNIEXPORT jstring JNICALL
Java_com_example_android_deviceinfo_DeviceInfoActivity_getMacAddress(JNIEnv *env, jobject instance) {

    jclass clazz = env->FindClass("java/net/NetworkInterface");
    jmethodID getHardwareAddressMethod = env->GetMethodID(clazz, "getHardwareAddress", "()[B");

    jclass inetAddressClazz = env->FindClass("java/net/InetAddress");
    jmethodID getByAddressMethod = env->GetStaticMethodID(inetAddressClazz, "getByAddress", "([B)Ljava/net/InetAddress;");

    jobjectArray networkInterfaces = (jobjectArray) env->CallStaticObjectMethod(clazz, env->GetStaticMethodID(clazz, "getNetworkInterfaces", "()Ljava/util/Enumeration;"));

    jstring result = env->NewStringUTF("");

    while (env->CallBooleanMethod(env->CallObjectMethod(networkInterfaces, env->GetMethodID(env->FindClass("java/util/Enumeration"), "hasMoreElements", "()Z")), env->GetMethodID(env->FindClass("java/util/Enumeration"), "nextElement", "()Ljava/lang/Object;"))) {

        jobject networkInterface = env->CallObjectMethod(networkInterfaces, env->GetMethodID(env->FindClass("java/util/Enumeration"), "nextElement", "()Ljava/lang/Object;"));

        jbyteArray hardwareAddress = (jbyteArray) env->CallObjectMethod(networkInterface, getHardwareAddressMethod);

        if (hardwareAddress == NULL) {
            continue;
        }

        jbyte *hardwareAddressBytes = env->GetByteArrayElements(hardwareAddress, NULL);
        jint hardwareAddressLength = env->GetArrayLength(hardwareAddress);

        stringstream ss;

        for (int i = 0; i < hardwareAddressLength; i++) {
            ss << hex << (int) hardwareAddressBytes[i];

            if (i != hardwareAddressLength - 1) {
                ss << ":";
            }
        }

        string macAddress = ss.str();

        if (macAddress != "") {
            result = env->NewStringUTF(macAddress.c_str());
            break;
        }
    }

    return result;
}

}

在Java代码中，需要声明native方法，并且使用System.loadLibrary来加载C++库。以下是在Java代码中调用上面定义的native方法的示例代码：

public class DeviceInfoActivity extends AppCompatActivity {

    static {
        System.loadLibrary("deviceinfo");
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_device_info);

        String imei = getIMEI();
        String macAddress = getMacAddress();

        TextView imeiTextView = findViewById(R.id.imeiTextView);
        imeiTextView.setText(imei);

        TextView macAddressTextView = findViewById(R.id.macAddressTextView);
        macAddressTextView.setText(macAddress);
    }

    public native String getIMEI();

    public native String getMacAddress();
}