你好您好！有什么可以帮到您呢？jni 检测是否录屏是否截屏JNI是Java Native Interface的缩写它允许Java代码调用本地CC++代码。要检测录屏或截屏您可以使用JNI调用本地代码然后在本地代码中使用系统API来检测屏幕状态。例如在Android平台上您可以使用MediaProjection API来检测屏幕录制。检测截屏可以使用Android平台上的MediaStore API

以下是一个检测Android设备是否正在录屏的JNI示例：

在Java代码中，我们定义一个native方法来调用本地代码：

public class ScreenUtils {
    static {
        System.loadLibrary("screenutils");
    }

    public static native boolean isScreenRecording();
}

在本地代码中，我们使用MediaProjection API来检测屏幕录制状态：

#include <jni.h>
#include <android/log.h>
#include <android/native_window.h>
#include <android/native_window_jni.h>
#include <android/media/mediaprojection.h>

#define LOG_TAG "ScreenUtils"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)

jboolean Java_com_example_screenutils_ScreenUtils_isScreenRecording(JNIEnv* env, jobject obj) {
    jboolean isRecording = JNI_FALSE;
    JNIEnv* jniEnv = NULL;
    ANativeWindow* window = NULL;
    jobject mediaProjection = NULL;

    // Get the current activity object
    jclass activityClass = (*env)->FindClass(env, "android/app/NativeActivity");
    jmethodID getActivityMethod = (*env)->GetMethodID(env, activityClass, "getActivity", "()Landroid/app/Activity;");
    jobject activity = (*env)->CallObjectMethod(env, obj, getActivityMethod);

    // Get the MediaProjectionManager
    jclass mediaProjectionManagerClass = (*env)->FindClass(env, "android/media/projection/MediaProjectionManager");
    jmethodID getMediaProjectionManagerMethod = (*env)->GetMethodID(env, activityClass, "getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;");
    jobject mediaProjectionManager = (*env)->CallObjectMethod(env, activity, getMediaProjectionManagerMethod, (*env)->NewStringUTF(env, "media_projection"));

    // Get the MediaProjection
    jmethodID createScreenCaptureIntentMethod = (*env)->GetMethodID(env, mediaProjectionManagerClass, "createScreenCaptureIntent", "()Landroid/content/Intent;");
    jobject screenCaptureIntent = (*env)->CallObjectMethod(env, mediaProjectionManager, createScreenCaptureIntentMethod);
    jclass activityResultClass = (*env)->FindClass(env, "android/app/ActivityResult");
    jmethodID startActivityResultMethod = (*env)->GetMethodID(env, activityClass, "startActivityForResult", "(Landroid/content/Intent;ILandroid/app/ActivityResult;)V");
    (*env)->CallVoidMethod(env, activity, startActivityResultMethod, screenCaptureIntent, 1, NULL);

    // Wait for the user to grant permission
    jclass mediaProjectionClass = (*env)->FindClass(env, "android/media/projection/MediaProjection");
    jmethodID getMediaProjectionMethod = (*env)->GetMethodID(env, activityResultClass, "getData", "()Landroid/content/Intent;");
    jobject mediaProjectionIntent = (*env)->CallObjectMethod(env, obj, getMediaProjectionMethod);
    if (mediaProjectionIntent != NULL) {
        jniEnv = (*env)->GetJavaVM(env, &jniEnv);
        mediaProjection = (*env)->NewGlobalRef(env, (*env)->CallObjectMethod(env, jniEnv->AttachCurrentThread(jniEnv, NULL), (*env)->GetMethodID(env, jniEnv->FindClass(jniEnv, "android/media/projection/MediaProjectionManager"), "getMediaProjection", "(ILandroid/content/Intent;)Landroid/media/projection/MediaProjection;"), 1, mediaProjectionIntent));
        window = ANativeWindow_fromSurface(env, (*env)->CallObjectMethod(env, mediaProjection, (*env)->GetMethodID(env, mediaProjectionClass, "createVirtualDisplay", "(Ljava/lang/String;IIIILandroid/view/Surface;Landroid/hardware/display/VirtualDisplayCallback;Landroid/os/Handler;)Landroid/hardware/display/VirtualDisplay;"), (*env)->NewStringUTF(env, "ScreenUtils"), 1080, 1920, 0, 1, ANativeWindow_fromSurfaceTexture(env, (*env)->CallObjectMethod(env, mediaProjection, (*env)->GetMethodID(env, mediaProjectionClass, "createVirtualDisplay", "(Ljava/lang/String;IIIILandroid/view/Surface;Landroid/hardware/display/VirtualDisplayCallback;Landroid/os/Handler;)Landroid/view/Surface;"), (*env)->NewStringUTF(env, "ScreenUtils"), 1080, 1920, 0, 1, NULL, NULL, NULL)))));
        if (window != NULL) {
            ANativeWindow_acquire(window);
            ANativeWindow_release(window);
            isRecording = JNI_TRUE;
        }
    }

    // Release resources
    if (mediaProjection != NULL) {
        (*env)->DeleteGlobalRef(env, mediaProjection);
    }
    if (window != NULL) {
        ANativeWindow_release(window);
    }

    return isRecording;
}

最后，我们需要将本地代码编译成动态库并将其命名为"libscreenutils.so"。在Android Studio中，我们可以通过以下步骤来完成：

1. 在项目的app目录下创建一个名为"jni"的文件夹。
2. 在"jni"文件夹中创建一个名为"Android.mk"的文件，并将以下内容复制到文件中：

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := screenutils
LOCAL_SRC_FILES := screenutils.c
include $(BUILD_SHARED_LIBRARY)

3. 在"jni"文件夹中创建一个名为"Application.mk"的文件，并将以下内容复制到文件中：

APP_ABI := all

4. 在"jni"文件夹中创建一个名为"screenutils.c"的文件，并将本地代码复制到文件中。
5. 在Android Studio的Terminal中，导航到"jni"文件夹，并运行以下命令：

ndk-build

6. 将生成的"libscreenutils.so"文件复制到"app/src/main/jniLibs"目录中。
7. 在Java代码中调用"isScreenRecording"方法即可检测屏幕录制状态。

希望这个例子对您有所帮助