NDK sample ＋ Android OpenCV 配置实例

来源：互联网发布：控制局域网网速软件编辑：程序博客网时间：2024/05/08 10:24

1.HelloJni.java

package com.example.hellojni;

import android.app.Activity;
import android.widget.TextView;
import android.os.Bundle;

public class HelloJni extends Activity
{

@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);

TextView tv = new TextView(this);
tv.setText( stringFromJNI() );
setContentView(tv);
}

public native String stringFromJNI();

public native String unimplementedStringFromJNI();

static {
System.loadLibrary("opencv_java");
System.loadLibrary("hello-jni");
}
}

2.hello-jni.c

#include <string.h>
#include <jni.h>
#include "opencv/cv.h"
#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"

jstring
Java_com_example_hellojni_HelloJni_stringFromJNI( JNIEnv* env,
jobject thiz )
{
CvCapture* capture = 0;
return (*env)->NewStringUTF(env, "Hello from JNI _opencv!");
}

3. Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
include /root/OpenCV_android/sdk/native/jni/OpenCV.mk

LOCAL_MODULE := hello-jni
LOCAL_SRC_FILES := hello-jni.c
include $(BUILD_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := libopencv_java
LOCAL_SRC_FILES := libopencv_java.so
include $(PREBUILT_SHARED_LIBRARY)

4. cp /root/OpenCV_android/sdk/native/libs/armeabi/libopencv_java.so 到项目jni目录，即

# ll
总用量 7936
-rw-r--r--. 1 root root 932 10月 6 04:02 Android.mk
-rw-r--r--. 1 root root 1264 10月 6 04:10 hello-jni.c
-rw-------. 1 root root 8116660 10月 6 04:04 libopencv_java.so

5. build project

....

Install : libhello-jni.so => libs/armeabi/libhello-jni.so
Install : libopencv_java.so => libs/armeabi/libopencv_java.so

6. Run

显示Hello from JNI _opencv!