纯c android int8_t,How to convert byte[] in Android to uint8_T array in C?

Java does not have unsigned integer types, but the camera does not really care. You can safely cast the byte array that arrives from onPictureTaken() callback to uint8_t*.

Sidenote: most likely, the picture will arrive as JPEG stream.

Update: Example of implementing onPictureTaken() in C.

Here is what you have somewhere in your activity:

mCamera = Camera.open();

mCamera.setPreviewDisplay(surfaceHolder);

mCamera.startPreview();

...

mCamera.takePicture(null, null, new android.hardware.Camera.NativePictureCallback);

Here is the file src/android/hardware/Camera/NativePictureCallback.java:

package android.hardware.Camera;

class NativePictureCallback: implements PictureCallback {

static {

System.loadLibrary("NativeCamera");

}

public void native onPictureTaken(byte[] data, Camera camera);

}

And here is the C file that is part of libNativeCamera.so:

include

include

real_T detection(const uint8_T* OriginalImage);

JNIEXPORT void JNICALL

Java_android_hardware_Camera_NativePictureCallback_onPictureTaken(

JNIEnv* env, jobject thiz, jbytearray data, jobject camera) {

jbyte* dataPtr = (*env)->GetByteArrayElements(env, data, NULL);

real_T res = detection((const uint8_T*)dataPtr);

(*env)->ReleaseByteArrayElements(env, data, dataPtr, JNI_ABORT);

}