Question

如何更改相机闪光灯JNI功能的状态？我希望能够进行ON / OFF状态控制，就像在Java CameraManager.setTorchMode(cameraId, state);方法中一样。我试图在原生相机API中搜索它，但没有成功。以下是我到目前为止所做的事情：

#include <jni.h>
#include <assert.h>
#include <jni.h>
#include <pthread.h>

#include <android/native_window_jni.h>

#include <camera/NdkCameraDevice.h>
#include <camera/NdkCameraManager.h>
#include <android/asset_manager.h>

#include "messages-internal.h"

JNIEXPORT void JNICALL
Java_com_android_rxjava_flashlightflicker_MainActivity_flasher(JNIEnv *env, jobject instance) {

    ACameraIdList *cameraIdList = NULL;
    const char *selectedCameraId = NULL;

    ACameraManager *cameraManager = ACameraManager_create();

    camera_status_t camera_status = ACAMERA_OK;
    camera_status = ACameraManager_getCameraIdList(cameraManager, &cameraIdList);

    /// Camera status not ok
    if (camera_status != ACAMERA_OK) {
        LOGE("Camera is bad id: %d \n", camera_status);
        return;
    }

    // There is no camera
    if (cameraIdList->numCameras < 1 ) {
        LOGE("Camera is not present on the device.");
        return;
    }

    selectedCameraId = cameraIdList->cameraIds[0];

    ACameraMetadata *cameraMetedata = NULL;

    ACameraManager_getCameraCharacteristics(cameraManager, selectedCameraId, &cameraMetedata);

   // ACaptureSessionOutput_create()

}

我也试过看资产经理但没有成功，任何有NDK相机经验的人能帮我一把吗？

提前致谢！

Answer 1

此方法仅适用于Java API。您可以通过JNI访问它，但IMO在Java中编写包装器静态方法并使用C ++代码调用此包装器会更容易，更安全。

Android NDK / JNI火炬状态控制

1 个答案: