Android实现对接海康摄像头SDK ：实时预览功能+无预览下设备抓拍 附带效果图！！(2023最新最全教程)_安卓调用海康sdk

Android海康摄像头无预览设备抓拍+预览功能

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前言

提示：海康摄像头的调试

在海康官网 下载 ivms-4200 客户端，并且 摄像头和电脑在一个网段内，

客户端会自动搜索 网段内的 摄像头。

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提示：以下是本篇文章正文内容，下面案例可供参考

一、海康sdk下载 ，成功后SDK引入项目

示例：应下载 设备网络SDK_Linux32 和 播放库SDK_Windows。（如下图）点击跳转

1.在gradle里面添加

sourceSets {
 main {
 jniLibs.srcDir 'libs'
 }
}
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2.将海康SDK复制进jnilibs中

3.更改SDKGuider.java中的文件路径

4. 添加ndk（在Android defaultConfig中添加）

ndk {
	abiFilters "armeabi-v7a", "arm64-v8a"
}
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4. 添加以下依赖

implementation fileTree(include: ['*.jar'], dir: 'libs')

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二、代码实现登陆设备，抓拍图片，预览

1.登陆设备（IP地址，端口号，用户名，密码）

代码如下（示例）： 初始化时调用即可

/**
     * @return login ID
     * @fn loginNormalDevice
     * @author lsw8569013
     * @brief login on device
     */
    private int loginNormalDevice() {
        // get instance
        m_oNetDvrDeviceInfoV30 = new NET_DVR_DEVICEINFO_V30();
        if (null == m_oNetDvrDeviceInfoV30) {
            Log.e(TAG, "HKNetDvrDeviceInfoV30 new is failed!");
            return -1;
        }
        // call NET_DVR_Login_v30 to login on, port 8000 as default
        int iLogID = HCNetSDK.getInstance().NET_DVR_Login_V30(ADDRESS, PORT,
                USER, PSD, m_oNetDvrDeviceInfoV30);
        if (iLogID < 0) {
            Log.e(TAG, "NET_DVR_Login is failed!Err:"
                    + HCNetSDK.getInstance().NET_DVR_GetLastError());
            return -1;
        }
        if (m_oNetDvrDeviceInfoV30.byChanNum > 0) {
            m_iStartChan = m_oNetDvrDeviceInfoV30.byStartChan;
            m_iChanNum = m_oNetDvrDeviceInfoV30.byChanNum;
        } else if (m_oNetDvrDeviceInfoV30.byIPChanNum > 0) {
            m_iStartChan = m_oNetDvrDeviceInfoV30.byStartDChan;
            m_iChanNum = m_oNetDvrDeviceInfoV30.byIPChanNum
                    + m_oNetDvrDeviceInfoV30.byHighDChanNum * 256;
        }
        Log.e(TAG, "NET_DVR_Login is Successful!");
        return iLogID;
    }
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2.抓拍图片

代码如下（示例）：

/**
     * 摄像头抓图
     * @param view
     */
    public void getPIC(View view) {
        String path = Environment.getExternalStorageDirectory()+"/抓图.jpg";
        NET_DVR_JPEGPARA jpegpara = new NET_DVR_JPEGPARA();
        jpegpara.wPicSize = 2;
        jpegpara.wPicQuality = 2;
        HCNetSDK NetSdk = HCNetSDK.getInstance();
        boolean b = NetSdk.NET_DVR_CaptureJPEGPicture(m_iLogID, 1, jpegpara, path);
        if(b){
            LogUtil.e("抓图成功");
            ImageView iv_showCAMERAPic = findViewById(R.id.iv_showCAMERAPic);
            iv_showCAMERAPic.setImageBitmap(BitmapFactory.decodeFile(path));
        }else{
            LogUtil.e("抓图error"+NetSdk.NET_DVR_GetLastError() ) ;
        }
    }
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2.预览视频 使用surfaceview实现摄像头画面预览

代码如下（示例）：

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {
private int m_iPreviewHandle = -1;
@Override
public void surfaceCreated(@NonNull SurfaceHolder holder) {
    m_surfaceView.getHolder().setFormat(PixelFormat.TRANSLUCENT);
    if (-1 == m_iPreviewHandle) {
        return;
    }
    Surface surface = holder.getSurface();
    if (surface.isValid()) {
        if (-1 == SDKGuider.g_sdkGuider.m_comPreviewGuider.RealPlaySurfaceChanged_jni(m_iPreviewHandle, 0, holder))
            Toast.makeText(MainActivity.this,"NET_DVR_PlayBackSurfaceChanged"+ SDKGuider.g_sdkGuider.GetLastError_jni(),Toast.LENGTH_SHORT).show();
    }
}

@Override
public void surfaceChanged(@NonNull SurfaceHolder holder, int format, int width, int height) {

}

@Override
public void surfaceDestroyed(@NonNull SurfaceHolder holder) {
    if (-1 == m_iPreviewHandle) {
        return;
    }
    if (holder.getSurface().isValid()) {
        if (-1 == SDKGuider.g_sdkGuider.m_comPreviewGuider.RealPlaySurfaceChanged_jni(m_iPreviewHandle, 0, null))
        {
            Toast.makeText(MainActivity.this,"NET_DVR_RealPlaySurfaceChanged"+ SDKGuider.g_sdkGuider.GetLastError_jni(),Toast.LENGTH_SHORT).show();
        }
    }
}
}
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添加“开始预览”按钮，并添加点击事件

private SurfaceView m_surfaceView = null;
private Button start;
private SurfaceHolder holder;


m_surfaceView = findViewById(R.id.Surface_Preview_Play);
holder = m_surfaceView.getHolder();
start = findViewById(R.id.button_preview_start);
start.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        m_surfaceView.getHolder().addCallback(MainActivity.this);
        m_surfaceView.setZOrderOnTop(true);
        SDKGuider.g_sdkGuider.m_comPreviewGuider.RealPlaySurfaceChanged_jni(m_iPreviewHandle, 0, holder);
        NET_DVR_PREVIEWINFO struPlayInfo = new NET_DVR_PREVIEWINFO();
        struPlayInfo.lChannel = 1;
        struPlayInfo.dwStreamType = 0;
        struPlayInfo.bBlocked = 1;
        struPlayInfo.hHwnd = m_surfaceView.getHolder();
        m_iPreviewHandle = SDKGuider.g_sdkGuider.m_comPreviewGuider.RealPlay_V40_jni(0,struPlayInfo, null);
        if (m_iPreviewHandle < 0)
        {
            Toast.makeText(MainActivity.this,"NET_DVR_RealPlay_V40 fail, Err:"+ SDKGuider.g_sdkGuider.GetLastError_jni(),Toast.LENGTH_SHORT).show();
            return;
        }
        Toast.makeText(MainActivity.this,"NET_DVR_RealPlay_V40 Succ " ,Toast.LENGTH_SHORT).show();
    }
});
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添加“停止预览”按钮，并添加点击事件

private Button stop;


stop = findViewById(R.id.button_stop);
stop.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (!SDKGuider.g_sdkGuider.m_comPreviewGuider.RealPlay_Stop_jni(m_iPreviewHandle))
        {
             Toast.makeText(getContext(),"摄像头停止预览失败" + m_iPreviewHandle + "  错误代码:" + SDKGuider.g_sdkGuider.GetLastError_jni(),Toast.LENGTH_SHORT).show();
             return;
        }
        m_iPreviewHandle = -1;
    }
});
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退出时，释放SDK资源

if (HCNetSDKJNAInstance.getInstance().NET_DVR_Cleanup()){
    Toast.makeText(getContext(), "摄像机SDK释放成功", Toast.LENGTH_SHORT).show();
}
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效果图（摄像头被供应商拿走了，只能放个测试图了）

创作不易，各位看官老爷多多支持！~

总结

提示：好了本次技术交流就在这里结束啦！以上方法本人亲测有效坑还是挺多的 像传统的通过对二进制数组解码，可以得到bitma抓拍这种方式延迟久，而且内存占据很大，我们抓拍的方式是本人亲测最快的一种了，当然像sdk初始化,预览这些官网里都是有源代码的