使用OpenCV

Question

我正在尝试使用OpenCV在Android Studio中加载和显示图像，但它崩溃了。我找不到问题在哪里...... 感谢任何帮助！谢谢！

public class MainActivity2 extends Activity {

private static final String TAG = "Kate : ";
BaseLoaderCallback mOpenCVCallBack;
Mat mRgba;
ImageView imge1;
@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main_activity2);
}


private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
    @Override
    public void onManagerConnected(int status) {
        switch (status) {
            case LoaderCallbackInterface.SUCCESS: {
                Log.i(TAG, "OpenCV loaded successfully");
                mRgba=new Mat();
                load_AND_display();
            }
            break;
            default: {
                super.onManagerConnected(status);
            }
            break;
        }
    }
};

public void load_AND_display() {

    //getting ImageView
    imge1= (ImageView) findViewById(R.id.img1);

    try {
        //Loading Image to Mat object
        mRgba= Utils.loadResource(this,R.drawable.mako,Highgui.CV_LOAD_IMAGE_COLOR);
    } catch (IOException e) {
        e.printStackTrace();
    }
    // create a bitmap:
    Bitmap bm = Bitmap.createBitmap(mRgba.cols(), mRgba.rows(),Bitmap.Config.ARGB_8888);
    // convert Mat image to bitmap::
    Utils.matToBitmap(mRgba, bm);
    //setting the image
    imge1.setImageBitmap(bm);
}

@Override
public void onResume() {
    super.onResume();
    mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
    /*OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_6, this, mLoaderCallback);*/
}

这是Logcat：

05-05 15:54:20.323  29948-29948/com.example.myapplication E/art﹕ No      implementation found for long org.opencv.core.Mat.n_Mat() (tried Java_org_opencv_core_Mat_n_1Mat and Java_org_opencv_core_Mat_n_1Mat__)
05-05 15:54:20.323  29948-29948/com.example.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.example.myapplication, PID: 29948
java.lang.UnsatisfiedLinkError: No implementation found for long org.opencv.core.Mat.n_Mat() (tried Java_org_opencv_core_Mat_n_1Mat and Java_org_opencv_core_Mat_n_1Mat__)

Answer 1

使用以下步骤：

1. 在主要活动中创建一个 loaderCallback 变量以检查 android studio 中的 OpenCv

 $(document).ready(function () {
        debugger;
        searchParameter = document.getElementById('malzemeKoduInput').value;
        $(function () {
      
            $("#malzemeKoduInput").autocomplete({
             source: function (request, response) {
            $.ajax({
            type: "POST",
            dataType: 'json',
                contentType: 'application/json; charset=utf-8',
                data: "{\"searchParameter\":\" " + request.term + " \"}",
                url: "@ViewBag.UrlPath/api/KritikUrunIzleme/KritikUrunMalzemeArama",
                dataFilter: function (data) { return data; },
                succes: function (data) {
                    debugger;
                    //controlUrunAramaList = data.kritikUrunMalzemeAramaList;
                    console.log(JSON.stringify(data));
                    response($.map(data, function(item) {
                        return item;
                    }))
            },
            error: function (data) {
                console.log(data);
                },
                minLength: 1
        });
        }
        
            });
        });
    });

2. 在主 Activity 的 private val mLoaderCallback: BaseLoaderCallback = object : BaseLoaderCallback(this) { override fun onManagerConnected(status: Int) { when (status) { SUCCESS -> { Log.e("OpenCV", "OpenCV loaded successfully") } else -> { super.onManagerConnected(status) } } } } 中，检查天气 OpenCv 是否已加载：

onResume()

3. 在 Activity 中——在调用任何 override fun onResume() { super.onResume() if (!OpenCVLoader.initDebug()) { Log.d( "OpenCV", "Internal OpenCV library not found. Using OpenCV Manager for initialization" ) OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, this, mLoaderCallback) } else { Log.d("OpenCV", "OpenCV library found inside package. Using it!") mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS) } } 操作或初始化 Mat 之前——调用：

opencv

4. 对于要使用的图像，将图像的位图转换为mat：

.....
setContentView(R.layout.activity_main)
OpenCVLoader.initDebug()
 .....

这里 val matObject = Mat() Utils.bitmapToMat(mBitmap, matObject) 是我们要使用的图像的位图，mBitmap 是 Utils.bitmapToMat() 的内置函数在您的代码中，将 drawable 作为位图加载，然后转换为垫子。